Green nanotechnology

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Green nanotechnology refers to the use of nanotechnology to enhance the environmental sustainability of processes producing negative externalities. It also refers to the use of the products of nanotechnology to enhance sustainability. It includes making green nano-products and using nano-products in support of sustainability.[ citation needed ]

Contents

The word GREEN in the name Green Nanotechnology has dual meaning. On one hand it describes the environment friendly technologies utilized to synthesize particles in nano scale; on the other hand it refers to the nanoparticles synthesis mediated by extracts of chlorophyllus plants. [1] Green nanotechnology has been described as the development of clean technologies, "to minimize potential environmental and human health risks associated with the manufacture and use of nanotechnology products. It also encourages replacement of existing products with new nano-products that are more environmentally friendly throughout their lifecycle." [2]

Aim

Green nanotechnology has two goals: producing nanomaterials and products without harming the environment or human health, and producing nano-products that provide solutions to environmental problems. It uses existing principles of green chemistry and green engineering [3] to make nanomaterials and nano-products without toxic ingredients, at low temperatures using less energy and renewable inputs wherever possible, and using lifecycle thinking in all design and engineering stages.

In addition to making nanomaterials and products with less impact to the environment, green nanotechnology also means using nanotechnology to make current manufacturing processes for non-nano materials and products more environmentally friendly. For example, nanoscale membranes can help separate desired chemical reaction products from waste materials from plants. Nanoscale catalysts can make chemical reactions more efficient and less wasteful. Sensors at the nanoscale can form a part of process control systems, working with nano-enabled information systems. Using alternative energy systems, made possible by nanotechnology, is another way to "green" manufacturing processes.

The second goal of green nanotechnology involves developing products that benefit the environment either directly or indirectly. Nanomaterials or products directly can clean hazardous waste sites, desalinate water, treat pollutants, or sense and monitor environmental pollutants. Indirectly, lightweight nanocomposites for automobiles and other means of transportation could save fuel and reduce materials used for production; nanotechnology-enabled fuel cells and light-emitting diodes (LEDs) could reduce pollution from energy generation and help conserve fossil fuels; self-cleaning nanoscale surface coatings could reduce or eliminate many cleaning chemicals used in regular maintenance routines; [4] and enhanced battery life could lead to less material use and less waste. Green Nanotechnology takes a broad systems view of nanomaterials and products, ensuring that unforeseen consequences are minimized and that impacts are anticipated throughout the full life cycle. [5]

Current research

Solar cells

Research is underway to use nanomaterials for purposes including more efficient solar cells, practical fuel cells, and environmentally friendly batteries. The most advanced nanotechnology projects related to energy are: storage, conversion, manufacturing improvements by reducing materials and process rates, energy saving (by better thermal insulation for example), and enhanced renewable energy sources.

One major project that is being worked on is the development of nanotechnology in solar cells. [6] Solar cells are more efficient as they get tinier and solar energy is a renewable resource. The price per watt of solar energy is lower than one dollar.

Research is ongoing to use nanowires and other nanostructured materials with the hope of to create cheaper and more efficient solar cells than are possible with conventional planar silicon solar cells. [7] [8] Another example is the use of fuel cells powered by hydrogen, potentially using a catalyst consisting of carbon supported noble metal particles with diameters of 1–5 nm. Materials with small nanosized pores may be suitable for hydrogen storage. Nanotechnology may also find applications in batteries, where the use of nanomaterials may enable batteries with higher energy content or supercapacitors with a higher rate of recharging.[ citation needed ]

Nanotechnology is already used to provide improved performance coatings for photovoltaic (PV) and solar thermal panels. Hydrophobic and self-cleaning properties combine to create more efficient solar panels, especially during inclement weather. PV covered with nanotechnology coatings are said to stay cleaner for longer to ensure maximum energy efficiency is maintained. [9]

Nanoremediation and water treatment

Nanotechnology offers the potential of novel nanomaterials for the treatment of surface water, groundwater, wastewater, and other environmental materials contaminated by toxic metal ions, organic and inorganic solutes, and microorganisms. Due to their unique activity toward recalcitrant contaminants, many nanomaterials are under active research and development for use in the treatment of water and contaminated sites. [10] [11]

The present market of nanotech-based technologies applied in water treatment consists of reverse osmosis(RO), nanofiltration, ultrafiltration membranes. Indeed, among emerging products one can name nanofiber filters, carbon nanotubes and various nanoparticles. [12]

Nanotechnology is expected to deal more efficiently with contaminants which convectional water treatment systems struggle to treat, including bacteria, viruses and heavy metals. This efficiency generally stems from the very high specific surface area of nanomaterials, which increases dissolution, reactivity and sorption of contaminants. [13] [14]

Environmental remediation

Nanoremediation is the use of nanoparticles for environmental remediation. [15] [16] Nanoremediation has been most widely used for groundwater treatment, with additional extensive research in wastewater treatment. [17] [18] [19] [20] Nanoremediation has also been tested for soil and sediment cleanup. [21] Even more preliminary research is exploring the use of nanoparticles to remove toxic materials from gases. [22]

Some nanoremediation methods, particularly the use of nano zerovalent iron for groundwater cleanup, have been deployed at full-scale cleanup sites. [16] Nanoremediation is an emerging industry; by 2009, nanoremediation technologies had been documented in at least 44 cleanup sites around the world, predominantly in the United States. [17] [11] [23] During nanoremediation, a nanoparticle agent must be brought into contact with the target contaminant under conditions that allow a detoxifying or immobilizing reaction. This process typically involves a pump-and-treat process or in situ application. Other methods remain in research phases.

Scientists have been researching the capabilities of buckminsterfullerene in controlling pollution, as it may be able to control certain chemical reactions. Buckminsterfullerene has been demonstrated as having the ability of inducing the protection of reactive oxygen species and causing lipid peroxidation. This material may allow for hydrogen fuel to be more accessible to consumers.[ citation needed ]

Water cleaning technology

In 2017 the RingwooditE Co Ltd was formed in order to explore Thermonuclear Trap Technology (TTT) for the purpose of cleaning all sources of water from pollution and toxic contents. This patented nanotechnology uses a high pressure and temperature chamber to separate isotopes that should by nature not be in drinking water to pure drinking water, as to the by the WHO´s established classification. This method has been developed by among others, by professor Vladimir Afanasiew, at the Moscow Nuclear Institution. This technology is targeted to clean Sea, river, lake and landfill waste waters. It even removes radioactive isotopes from the sea water, after Nuclear Power Stations catastrophes and cooling water plant towers. By this technology pharmaca rests are being removed as well as narcotics and tranquilizers. Bottom layers and sides at lake and rivers can be returned, after being cleaned. Machinery used for this purpose are much similar to those of deep sea mining. Removed waste items are being sorted by the process, and can be re used as raw material for other industrial production.

Water filtration

Nanofiltration is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening (polyvalent cation removal) and removal of disinfection by-product precursors such as natural organic matter and synthetic organic matter. [24] [25] Nanofiltration is also becoming more widely used in food processing applications such as dairy, for simultaneous concentration and partial (monovalent ion) demineralisation.

Nanofiltration is a membrane filtration based method that uses nanometer sized cylindrical through-pores that pass through the membrane at a 90°. Nanofiltration membranes have pore sizes from 1-10 Angstrom, smaller than that used in microfiltration and ultrafiltration, but just larger than that in reverse osmosis. Membranes used are predominantly created from polymer thin films. Materials that are commonly used include polyethylene terephthalate or metals such as aluminum. [26] Pore dimensions are controlled by pH, temperature and time during development with pore densities ranging from 1 to 106 pores per cm2. Membranes made from polyethylene terephthalate and other similar materials, are referred to as "track-etch" membranes, named after the way the pores on the membranes are made. [27] "Tracking" involves bombarding the polymer thin film with high energy particles. This results in making tracks that are chemically developed into the membrane, or "etched" into the membrane, which are the pores. Membranes created from metal such as alumina membranes, are made by electrochemically growing a thin layer of aluminum oxide from aluminum in an acidic medium.

Some water-treatment devices incorporating nanotechnology are already on the market, with more in development. Low-cost nanostructured separation membranes methods have been shown to be effective in producing potable water in a recent study. [28]

Nanotech to disinfect water

Nanotechnology provides an alternative solution to clean germs in water, a problem that has been getting worse due to the population explosion, growing need for clean water and the emergence of additional pollutants. One of the alternatives offered is antimicrobial nanotechnology stated that several nanomaterials showed strong antimicrobial properties through diverse mechanisms, such as photocatalytic production of reactive oxygen species that damage cell components and viruses. [28] There is also the case of the synthetically-fabricated nanometallic particles that produce antimicrobial action called oligodynamic disinfection, which can inactivate microorganisms at low concentrations. [29] Commercial purification systems based on titanium oxide photocatalysis also currently exist and studies show that this technology can achieve complete inactivation of fecal coliforms in 15 minutes once activated by sunlight. [29]

There are four classes of nanomaterials that are employed for water treatment and these are dendrimers, zeolites, carbonaceous nanomaterials, and metals containing nanoparticles. [30] The benefits of the reduction of the size of the metals (e.g. silver, copper, titanium, and cobalt) to the nanoscale such as contact efficiency, greater surface area, and better elution properties. [29]

Medicical values

The plants have been known to possess various phytochemicals (secondary metabolites) which help them to protect themselves, these phytoehemicals since time immemorial have been used by humans for their medicinal needs. [31] The microbes are developing resistant again multiple synthetic drugs, thus leading to the emergence of MDR (Multi Drug Resistant) strains of microbes, which pose a challenge to the modern drug system. [32] , [33] To overcome this challenge, the nanoparticles synthesized using extracts of plant and plant parts have emerged as a hope. [34] , [35] Many workers have reported that the nanoparticles synthesized using plant extracts have shown to exhibit enhanced medicinal properties as compared to the extract(s) alone. [36]

Cleaning up oil spills

The U.S. Environmental Protection Agency (EPA) documents more than ten thousand oil spills per year. Conventionally, biological, dispersing, and gelling agents are deployed to remedy oil spills. Although, these methods have been used for decades, none of these techniques can retrieve the irreplaceable lost oil. However, nanowires can not only swiftly clean up oil spills but also recover as much oil as possible. These nanowires form a mesh that absorbs up to twenty times its weight in hydrophobic liquids while rejecting water with its water repelling coating. Since the potassium manganese oxide is very stable even at high temperatures, the oil can be boiled off the nanowires and both the oil and the nanowires can then be reused. [37]

In 2005, Hurricane Katrina damaged or destroyed more than thirty oil platforms and nine refineries. The Interface Science Corporation successfully launched a new oil remediation and recovery application, which used the water repelling nanowires to clean up the oil spilled by the damaged oil platforms and refineries. [38]

Removing plastics from oceans

One innovation of green nanotechnology that is currently under development are nanomachines modeled after a bacterium bioengineered to consume plastics, Ideonella sakaiensis . These nano-machines are able to decompose plastics dozens of times faster than the bioengineered bacteria not only because of their increased surface area but also because the energy released from decomposing the plastic is used to fuel the nano-machines. [ citation needed ]

Air pollution control

In addition to water treatment and environmental remediation, nanotechnology is currently improving air quality. Nanoparticles can be engineered to catalyze, or hasten, the reaction to transform environmentally pernicious gases into harmless ones. For example, many industrial factories that produce large amounts harmful gases employ a type of nanofiber catalyst made of magnesium oxide (Mg2O) to purify dangerous organic substances in the smoke. Although chemical catalysts already exist in the gaseous vapors from cars, nanotechnology has a greater chance of reacting with the harmful substances in the vapors. This greater probability comes from the fact that nanotechnology can interact with more particles because of its greater surface area. [39]

Nanotechnology has been used to remediate air pollution including car exhaust pollution, and potentially greenhouse gases due to its high surface area. Based on research done by the Environmental Science Pollution Research International, nanotechnology can specifically help to treat carbon-based nanoparticles, greenhouse gases, and volatile organic compounds. There is also work being done to develop antibacterial nanoparticles, metal oxide nanoparticles, and amendment agents for phytoremediation processes. Nanotechnology can also give the possibility of preventing air pollution in the first place due to its extremely small scale. Nanotechnology has been accepted as a tool for many industrial and domestic fields like gas monitoring systems, fire and toxic gas detectors, ventilation control, breath alcohol detectors and many more. Other sources state that nanotechnology has the potential to develop the pollutants sensing and detection methods that already exist. The ability to detect pollutants and sense unwanted materials will be heightened by the large surface area of nanomaterials and their high surface energy. The World Health Organization declared in 2014 that air contamination caused around 7 million deaths in 2012. This new technology could be an essential asset to this epidemic. The three ways that nanotechnology is being used to treat air pollution are nano-adsorptive materials, degradation by nanocatalysis, and filtration/separation by nanofilters. Nanoscale adsorbents being the main alleviator for many air pollution difficulties. Their structure permits a great interaction with organic compounds as well as increased selectivity and stability in maximum adsorption capacity. Other advantages include high electrical and thermal conductivities, high strength, high hardness. Target pollutants that can be targeted by nanomolecules are 〖NO〗_x, 〖CO〗_2, 〖NH〗_3, N_2, VOCs, Isopropyl vapor, 〖CH〗_3 OH gases, N_2 O, H_2 S. Carbon nanotubes specifically remove particles in many ways. One method is by passing them through the nanotubes where the molecules are oxidized; the molecules then are adsorbed on a nitrate species. Carbon nanotubes with amine groups provide numerous chemical sites for carbon dioxide adsorption at low temperature ranges of 20°-100° degrees Celsius. Van der Waals forces and π-π interactions also are used to pull molecules onto surface functional groups. Fullerene can be used to rid of carbon dioxide pollution due to its high adsorption capacity. Graphene nanotubes have functional groups that adsorb gases. There are plenty of nanocatalysts that can be used for air pollution reduction and air quality. Some of these materials include 〖TiO〗_2, Vanadium, Platinum, Palladium, Rhodium, and Silver. Catalytic industrial emission reduction, car exhaust reduction, and air purification are just some of the major thrusts that these nanomaterials are being utilized within. Certain applications are not widely spread, but other are more popular. Indoor air pollution is barely on the market yet, but it is being developed more efficiently due to complications with health effects. Car exhaust emission reduction is widely used in diesel fueled automobiles currently being one of the more popular applications. Industrial emission reduction is also widely used. It is n integral method specifically at coal fired power plants as well as refineries. These methods are analyzed and reviewed using SEM imaging to ensure its usefulness and accuracy. [40] [41]

Additionally, research is currently being conducted to find out if nanoparticles can be engineered to separate car exhaust from methane or carbon dioxide, [39] which has been known to damage the Earth's ozone layer. In fact, John Zhu, a professor at the University of Queensland, is exploring the creation of a carbon nanotube(CNT) which can trap greenhouse gases hundreds of times more efficiently than current methods can. [42]

Nanotechnology for sensors

Perpetual exposure to heavy metal pollution and particulate matter will lead to health concerns such as lung cancer, heart conditions, and even motor neuron diseases. However, humanity's ability to shield themselves from these health problems can be improved by accurate and swift nanocontact-sensors able to detect pollutants at the atomic level. These nanocontact sensors do not require much energy to detect metal ions or radioactive elements. Additionally, they can be made in automatic mode so that they can be readably used at any given moment. Additionally, these nanocontact sensors are energy and cost effective since they are composed with conventional microelectronic manufacturing equipment using electrochemical techniques. [37]

Some examples of nano-based monitoring include:

  1. Functionalized nanoparticles able to form anionic oxidants bonding thereby allowing the detection of carcinogenic substances at very low concentrations. [39]
  2. Polymer nanospheres have been developed to measure organic contaminates in very low concentrations
  3. "Peptide nanoelectrodes have been employed based on the concept of thermocouple. In a 'nano-distance separation gap, a peptide molecule is placed to form a molecular junction. When a specific metal ion is bound to the gap; the electrical current will result conductance in a unique value. Hence the metal ion will be easily detected." [42]
  4. Composite electrodes, a mixture of nanotubes and copper, have been created to detect substances such as organophosphorus pesticides, carbohydrates and other woods pathogenic substances in low concentrations.

Concerns

Although green nanotechnology poses many advantages over traditional methods, there is still much debate about the concerns brought about by nanotechnology. For example, since the nanoparticles are small enough to be absorbed into skin and/or inhaled, countries are mandating that additional research revolving around the impact of nanotechnology on organisms be heavily studied. In fact, the field of eco-nanotoxicology was founded solely to study the effect of nanotechnology on earth and all of its organisms. At the moment, scientists are unsure of what will happen when nanoparticles seep into soil and water, but organizations, such as NanoImpactNet, have set out to study these effects. [39]

See also

Related Research Articles

<span class="mw-page-title-main">Nanotechnology</span> Field of science involving control of matter on atomic and (supra)molecular scales

Nanotechnology is the manipulation of matter with at least one dimension sized from 1 to 100 nanometers (nm). At this scale, commonly known as the nanoscale, surface area and quantum mechanical effects become important in describing properties of matter. This definition of nanotechnology includes all types of research and technologies that deal with these special properties. It is common to see the plural form "nanotechnologies" as well as "nanoscale technologies" to refer to research and applications whose common trait is scale. An earlier understanding of nanotechnology referred to the particular technological goal of precisely manipulating atoms and molecules for fabricating macroscale products, now referred to as molecular nanotechnology.

Nanomedicine is the medical application of nanotechnology. Nanomedicine ranges from the medical applications of nanomaterials and biological devices, to nanoelectronic biosensors, and even possible future applications of molecular nanotechnology such as biological machines. Current problems for nanomedicine involve understanding the issues related to toxicity and environmental impact of nanoscale materials.

Nanosensors are nanoscale devices that measure physical quantities and convert these to signals that can be detected and analyzed. There are several ways proposed today to make nanosensors; these include top-down lithography, bottom-up assembly, and molecular self-assembly. There are different types of nanosensors in the market and in development for various applications, most notably in defense, environmental, and healthcare industries. These sensors share the same basic workflow: a selective binding of an analyte, signal generation from the interaction of the nanosensor with the bio-element, and processing of the signal into useful metrics.

<span class="mw-page-title-main">Nanomaterials</span> Materials whose granular size lies between 1 and 100 nm

Nanomaterials describe, in principle, chemical substances or materials of which a single unit is sized between 1 and 100 nm.

<span class="mw-page-title-main">Nanochemistry</span> Combination of chemistry and nanoscience

Nanochemistry is an emerging sub-discipline of the chemical and material sciences that deals with the development of new methods for creating nanoscale materials. The term "nanochemistry" was first used by Ozin in 1992 as 'the uses of chemical synthesis to reproducibly afford nanomaterials from the atom "up", contrary to the nanoengineering and nanophysics approach that operates from the bulk "down"'. Nanochemistry focuses on solid-state chemistry that emphasizes synthesis of building blocks that are dependent on size, surface, shape, and defect properties, rather than the actual production of matter. Atomic and molecular properties mainly deal with the degrees of freedom of atoms in the periodic table. However, nanochemistry introduced other degrees of freedom that controls material's behaviors by transformation into solutions. Nanoscale objects exhibit novel material properties, largely as a consequence of their finite small size. Several chemical modifications on nanometer-scaled structures approve size dependent effects.

Nanotechnology is impacting the field of consumer goods, several products that incorporate nanomaterials are already in a variety of items; many of which people do not even realize contain nanoparticles, products with novel functions ranging from easy-to-clean to scratch-resistant. Examples of that car bumpers are made lighter, clothing is more stain repellant, sunscreen is more radiation resistant, synthetic bones are stronger, cell phone screens are lighter weight, glass packaging for drinks leads to a longer shelf-life, and balls for various sports are made more durable. Using nanotech, in the mid-term modern textiles will become "smart", through embedded "wearable electronics", such novel products have also a promising potential especially in the field of cosmetics, and has numerous potential applications in heavy industry. Nanotechnology is predicted to be a main driver of technology and business in this century and holds the promise of higher performance materials, intelligent systems and new production methods with significant impact for all aspects of society.

The impact of nanotechnology extends from its medical, ethical, mental, legal and environmental applications, to fields such as engineering, biology, chemistry, computing, materials science, and communications.

Nanoelectronics refers to the use of nanotechnology in electronic components. The term covers a diverse set of devices and materials, with the common characteristic that they are so small that inter-atomic interactions and quantum mechanical properties need to be studied extensively. Some of these candidates include: hybrid molecular/semiconductor electronics, one-dimensional nanotubes/nanowires or advanced molecular electronics.

<span class="mw-page-title-main">Nanobatteries</span> Type of battery

Nanobatteries are fabricated batteries employing technology at the nanoscale, particles that measure less than 100 nanometers or 10−7 meters. These batteries may be nano in size or may use nanotechnology in a macro scale battery. Nanoscale batteries can be combined to function as a macrobattery such as within a nanopore battery.

Nanofiltration is a membrane filtration process that uses nanometer sized pores through which particles smaller than about 1–10 nanometers pass through the membrane. Nanofiltration membranes have pore sizes of about 1–10 nanometers, smaller than those used in microfiltration and ultrafiltration, but a slightly bigger than those in reverse osmosis. Membranes used are predominantly polymer thin films. It is used to soften, disinfect, and remove impurities from water, and to purify or separate chemicals such as pharmaceuticals.

As the world's energy demand continues to grow, the development of more efficient and sustainable technologies for generating and storing energy is becoming increasingly important. According to Dr. Wade Adams from Rice University, energy will be the most pressing problem facing humanity in the next 50 years and nanotechnology has potential to solve this issue. Nanotechnology, a relatively new field of science and engineering, has shown promise to have a significant impact on the energy industry. Nanotechnology is defined as any technology that contains particles with one dimension under 100 nanometers in length. For scale, a single virus particle is about 100 nanometers wide.

<span class="mw-page-title-main">Iron nanoparticle</span>

Nanoscale iron particles are sub-micrometer particles of iron metal. They are highly reactive because of their large surface area. In the presence of oxygen and water, they rapidly oxidize to form free iron ions. They are widely used in medical and laboratory applications and have also been studied for remediation of industrial sites contaminated with chlorinated organic compounds.

The following outline is provided as an overview of and topical guide to nanotechnology:

Membrane technology encompasses the scientific processes used in the construction and application of membranes. Membranes are used to facilitate the transport or rejection of substances between mediums, and the mechanical separation of gas and liquid streams. In the simplest case, filtration is achieved when the pores of the membrane are smaller than the diameter of the undesired substance, such as a harmful microorganism. Membrane technology is commonly used in industries such as water treatment, chemical and metal processing, pharmaceuticals, biotechnology, the food industry, as well as the removal of environmental pollutants.

The applications of nanotechnology, commonly incorporate industrial, medicinal, and energy uses. These include more durable construction materials, therapeutic drug delivery, and higher density hydrogen fuel cells that are environmentally friendly. Being that nanoparticles and nanodevices are highly versatile through modification of their physiochemical properties, they have found uses in nanoscale electronics, cancer treatments, vaccines, hydrogen fuel cells, and nanographene batteries.

Nanoremediation is the use of nanoparticles for environmental remediation. It is being explored to treat ground water, wastewater, soil, sediment, or other contaminated environmental materials. Nanoremediation is an emerging industry; by 2009, nanoremediation technologies had been documented in at least 44 cleanup sites around the world, predominantly in the United States. In Europe, nanoremediation is being investigated by the EC funded NanoRem Project. A report produced by the NanoRem consortium has identified around 70 nanoremediation projects worldwide at pilot or full scale. During nanoremediation, a nanoparticle agent must be brought into contact with the target contaminant under conditions that allow a detoxifying or immobilizing reaction. This process typically involves a pump-and-treat process or in situ application.

<span class="mw-page-title-main">Mercury nano-trap water filtration</span> Method of eliminating pollution

Mercury is considered to be one of the most notorious metal pollutants present in food, water, air and soil, but the process of eliminating it is limited. Heavy metals such as mercury are formed on the Earth's crust and made into solutions with ground water through certain natural processing and pH changes occurring in the soil. There are traditional methods that are used to extract mercury from the natural water sources and industrial waste water, such as chemical precipitation, amalgamation, reverse osmosis, membrane filtration and photochemical methods. However, these methods are expensive, time-consuming, and inefficient, hence the need for a nanofiltration technology that overcomes all of these issues. Nanofiltration technology is very efficient in removal of mercury species due to its characteristics of having high surface area-to-volume and the fact that it's easily chemically functionalized. Additionally, Brownian motion of nanomaterials allows them to scan large volume of solvent in short times. There are many copolymer nanoparticles (NPs) that can be used as scavengers to eliminate mercury species via redox reactions such as selenium NPs, manganese dioxide nanowhiskers, carbon nanotube−silverNP composites, silver NPs, silver NP-decorated silicaspheres, gold NP-based materials. Among these adsorbents, citrate-capped gold NP-based materials have been used intensively to capture mercury species from nature water.

There are many water purifiers available in the market which use different techniques like boiling, filtration, distillation, chlorination, sedimentation and oxidation. Currently nanotechnology plays a vital role in water purification techniques. Nanotechnology is the process of manipulating atoms on a nanoscale. In nanotechnology, nanomembranes are used with the purpose of softening the water and removal of contaminants such as physical, biological and chemical contaminants. There are variety of techniques in nanotechnology which uses nanoparticles for providing safe drinking water with a high level of effectiveness. Some techniques have become commercialized.

Andrew R. Barron is a British chemist, academic, and entrepreneur. He is the Sêr Cymru Chair of Low Carbon Energy and Environment at Swansea University, and the Charles W. Duncan Jr.-Welch Foundation Chair in Chemistry at Rice University. He is the founder and director of Energy Safety Research Institute (ESRI) at Swansea University, which consolidates the energy research at the University with a focus on environmental impact and future security. At Rice University, he leads a Research Group and has served as Associate Dean for Industry Interactions and Technology Transfer.

<span class="mw-page-title-main">Qilin Li</span> Professor of Civil and Environmental Engineering

Qilin Li is a Chinese environmental engineer who is a professor of Civil and Environmental Engineering at Rice University. She develops new technologies to analyze and treat contaminated water. Li is a Fellow of the International Water Association.

References

  1. ↑ Manoj K., Rakesh R., Sinha M. P. and Raipat B. S. (2023). Different techniques utilized for characterization of metallic nanoparticles synthesized using biological agents: A review. Balneo and PRM Research Journal, 14(1): 534.
  2. ↑ "Environment and Green Nano – Topics – Nanotechnology Project" . Retrieved 11 September 2011.
  3. ↑ What is Green Engineering, US Environmental Protection Agency
  4. ↑ "Sustainable Nano Coatings". nanoShell Ltd. Archived from the original on 8 February 2013. Retrieved 3 January 2013.
  5. ↑ "Nanotechnology and Life Cycle Assessment" (PDF). Archived from the original (PDF) on 2018-04-17. Retrieved 2008-04-03.
  6. ↑ "Nano Flake Technology – A Cheaper Way to Produce Solar Cells". Archived from the original on 2014-03-08. Retrieved 2014-03-01.
  7. ↑ Tian, Bozhi; Zheng, Xiaolin; Kempa, Thomas J.; Fang, Ying; Yu, Nanfang; Yu, Guihua; Huang, Jinlin; Lieber, Charles M. (2007). "Coaxial silicon nanowires as solar cells and nanoelectronic power sources". Nature. 449 (7164): 885–889. Bibcode:2007Natur.449..885T. doi:10.1038/nature06181. ISSN   0028-0836. PMID   17943126. S2CID   2688078.
  8. ↑ Johlin, Eric; Al-Obeidi, Ahmed; Nogay, Gizem; Stuckelberger, Michael; Buonassisi, Tonio; Grossman, Jeffrey C. (2016). "Nanohole Structuring for Improved Performance of Hydrogenated Amorphous Silicon Photovoltaics". ACS Applied Materials & Interfaces. 8 (24): 15169–15176. doi:10.1021/acsami.6b00033. hdl: 1721.1/111823 . ISSN   1944-8244. PMID   27227369. S2CID   42437702.
  9. ↑ "Improved Performance Coatings". nanoShell Ltd. Archived from the original on 8 February 2013. Retrieved 3 January 2013.
  10. ↑ Cloete, TE; et al., eds. (2010). Nanotechnology in Water Treatment Applications. Caister Academic Press. ISBN   978-1-904455-66-0.[ page needed ]
  11. 1 2 Karn, Barbara; Kuiken, Todd; Otto, Martha (2009). "Nanotechnology and in Situ Remediation: A Review of the Benefits and Potential Risks". Environmental Health Perspectives. 117 (12): 1813–1831. doi:10.1289/ehp.0900793. PMC   2799454 . PMID   20049198.
  12. ↑ Hanft, Susan (2011). Market Research Report Nanotechnology in water treatment. Wellesley, MA USA: BCC Research. p. 16. ISBN   978-1-59623-709-4.
  13. ↑ k. Goyal, Amit; s. Johal, E.; Rath, G. (2011). "Nanotechnology for Water Treatment". Current Nanoscience. 7 (4): 640. Bibcode:2011CNan....7..640K. doi:10.2174/157341311796196772.
  14. ↑ Qu, Xiaolei; Alvarez, Pedro J.J.; Li, Qilin (2013). "Applications of nanotechnology in water and wastewater treatment". Water Research. 47 (12): 3931–3946. doi:10.1016/j.watres.2012.09.058. PMID   23571110.
  15. ↑ Crane, R.A.; Scott, T.B. (2012). "Nanoscale zero-valent iron: Future prospects for an emerging water treatment technology". Journal of Hazardous Materials. 211–212: 112–125. doi:10.1016/j.jhazmat.2011.11.073. PMID   22305041.
  16. 1 2 U.S. EPA (2012-11-14). "Nanotechnologies for environmental cleanup". Archived from the original on 2014-08-08. Retrieved 2014-07-29.
  17. 1 2 Mueller, Nicole C.; Braun, Jürgen; Bruns, Johannes; Černík, Miroslav; Rissing, Peter; Rickerby, David; Nowack, Bernd (2012). "Application of nanoscale zero valent iron (NZVI) for groundwater remediation in Europe" (PDF). Environmental Science and Pollution Research. 19 (2): 550–558. doi:10.1007/s11356-011-0576-3. PMID   21850484. S2CID   9275838.
  18. ↑ U.S. EPA. "Remediation: Selected Sites Using or Testing Nanoparticles for Remediation". Archived from the original on 2015-04-16. Retrieved 2014-07-29.
  19. ↑ Theron, J.; Walker, J. A.; Cloete, T. E. (2008). "Nanotechnology and Water Treatment: Applications and Emerging Opportunities". Critical Reviews in Microbiology. 34 (1): 43–69. doi:10.1080/10408410701710442. PMID   18259980. S2CID   84106967.
  20. ↑ Chong, Meng Nan; Jin, Bo; Chow, Christopher W.K.; Saint, Chris (2010). "Recent developments in photocatalytic water treatment technology: A review". Water Research. 44 (10): 2997–3027. doi:10.1016/j.watres.2010.02.039. PMID   20378145. S2CID   11490118.
  21. ↑ Gomes, Helena I.; Dias-Ferreira, Celia; Ribeiro, Alexandra B. (2013). "Overview of in situ and ex situ remediation technologies for PCB-contaminated soils and sediments and obstacles for full-scale application". Science of the Total Environment. 445–446: 237–260. Bibcode:2013ScTEn.445..237G. doi:10.1016/j.scitotenv.2012.11.098. PMID   23334318.
  22. ↑ Sánchez, Antoni; Recillas, Sonia; Font, Xavier; Casals, Eudald; González, Edgar; Puntes, Víctor (2011). "Ecotoxicity of, and remediation with, engineered inorganic nanoparticles in the environment". TrAC Trends in Analytical Chemistry. 30 (3): 507–516. doi:10.1016/j.trac.2010.11.011.
  23. ↑ Project on Emerging Nanotechnologies. "Nanoremediation Map". Archived from the original on 2019-12-15. Retrieved 2013-11-19.
  24. ↑ Raymond D. Letterman (ed.)(1999). "Water Quality and Treatment." 5th Ed. (New York: American Water Works Association and McGraw-Hill.) ISBN   0-07-001659-3.
  25. ↑ Dow Chemical Co. Nanofiltration Membranes and Applications Archived 2016-08-10 at the Wayback Machine
  26. ↑ Baker, Lane A.; Martin, Charles R. (2007). "Nanotube-Based Membrane Systems". In Vo-Dinh, Tuan (ed.). Nanotechnology in Biology and Medicine: Methods, Devices and Applications. doi:10.1201/9781420004441. ISBN   978-1-4200-0444-1.
  27. ↑ Apel, P.; Blonskaya, I.; Dmitriev, S.; Orelovitch, O.; Sartowska, B. (2006). "Structure of polycarbonate track-etch membranes: Origin of the "paradoxical" pore shape". Journal of Membrane Science. 282 (1–2): 393–400. doi:10.1016/j.memsci.2006.05.045.
  28. 1 2 Hillie, Thembela; Hlophe, Mbhuti (2007). "Nanotechnology and the challenge of clean water". Nature Nanotechnology. 2 (11): 663–4. Bibcode:2007NatNa...2..663H. doi: 10.1038/nnano.2007.350 . PMID   18654395.
  29. 1 2 3 Street, Anita; Sustich, Richard; Duncan, Jeremiah; Savage, Nora (2014). Nanotechnology Applications for Clean Water: Solutions for Improving Water Quality. Oxford: Elsevier. pp. 286, 322. ISBN   978-1-4557-3116-9.
  30. ↑ Kumar, Jyot; Pandit, Aniruddha (2012). Drinking Water Disinfection Techniques. Boca Raton, FL: CRC Press. p. 186. ISBN   978-1-4398-7741-8.
  31. ↑ Manoj K., Rakesh R., Dandapat S., Srivastava R., Bharti S.R., Manoranjan P.S. (2023). Green nanotechnology: Synthesis of silver nanoparticles using aqueous leaf extracts of Swertia chirayita and Punica granatum. The Bioscan, 18(3): 167 - 176
  32. ↑ Manoj K., Rakesh R., Manoranjan P.S. (2024). Impact of leaf extract of Punica granatum and synthesized silver nanoparticles against streptozotocin induced diabetes in rats. in Pharmacology, Published by Intechopen DOI: 10.5772/intechopen.1003780
  33. ↑ Manoj K., Kumar A., Dandapat S., Sinha M.P. (2013). Phytochemical screening and antioxidant potency of Adhatoda vasica and Vitex negundo. The Bioscan, 8(2): 727-730.
  34. ↑ Manoj K., Dandapat S., Rakesh R., Kumar A., Manoranjan P. S. (2018). Plant mediated synthesis of silver nanopartilces using Punica granatum aqueous leaf extract. Journal of Microbiology and Experimentation, 6(4): 175 - 178.
  35. ↑ Shankar S.S., Rai A., Ankmwar B. (2004). Biological synthesis of tirangular gold nanoprisms. Nat. Mater., 3(7): 482 - 488.
  36. ↑ Manoj K., Manorajan P.S. (2017). Green Nanotechnology: Synthesis of silver nanopartilces using aqueous leaf extract of Swertia chirayita. Notulae Scientia Biologicae, 9(3): 443-448.
  37. 1 2 Sofian Yunus, Ian; Harwin; Kurniawan, Adi; Adityawarman, Dendy; Indarto, Antonius (2012). "Nanotech For Oil". Environmental Technology Reviews. 1: 136–148. doi: 10.1080/21622515.2012.733966 . S2CID   128948137.
  38. ↑ "Solutions for the Catastrophe Katrina Left". 7 September 2005. Retrieved 20 September 2017.
  39. 1 2 3 4 "Turning to Nanotechnology for Pollution Control: Applications of Nanoparticles – Topics – Nanotechnology for Pollution Control" . Retrieved 20 September 2017.
  40. ↑ Ibrahim, Rusul Khaleel; Hayyan, Maan; Alsaadi, Mohammed Abdulhakim; Hayyan, Adeeb; Ibrahim, Shaliza (2016). "Environmental application of nanotechnology: Air, soil, and water". Environmental Science and Pollution Research. 23 (14): 13754–13788. Bibcode:2016ESPR...2311471P. doi:10.1007/s11356-016-6457-z. PMID   27074929. S2CID   36630732.
  41. ↑ Ramadan, A. B. A. (2009). "Air Pollution Monitoring and Use of Nanotechnology Based Solid State Gas Sensors in Greater Cairo Area, Egypt". Nanomaterials: Risks and Benefits. NATO Science for Peace and Security Series C: Environmental Security. pp. 265–273. Bibcode:2009nrb..book..265R. doi:10.1007/978-1-4020-9491-0_20. ISBN   978-1-4020-9490-3.
  42. 1 2 "Professor John Zhu of THe university of Queensland". Archived from the original on 23 September 2017. Retrieved 20 September 2017.

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