Navigation Links
Nanotechnology for water purification
Date:7/28/2010

Nanotechnology refers to a broad range of tools, techniques and applications that simply involve particles on the approximate size scale of a few to hundreds of nanometers in diameter. Particles of this size have some unique physicochemical and surface properties that lend themselves to novel uses. Indeed, advocates of nanotechnology suggest that this area of research could contribute to solutions for some of the major problems we face on the global scale such as ensuring a supply of safe drinking water for a growing population, as well as addressing issues in medicine, energy, and agriculture.

Writing in the International Journal of Nuclear Desalination, researchers at the D.J. Sanghvi College of Engineering, in Mumbai, India, explain that there are several nanotechnology approaches to water purification currently being investigated and some already in use. "Water treatment devices that incorporate nanoscale materials are already available, and human development needs for clean water are pressing," Alpana Mahapatra and colleagues Farida Valli and Karishma Tijoriwala, explain.

Water purification using nanotechnology exploits nanoscopic materials such as carbon nanotubes and alumina fibers for nanofiltration, it also utilizes the existence of nanoscopic pores in zeolite filtration membranes, as well as nanocatalysts and magnetic nanoparticles. Nanosensors, such as those based on titanium oxide nanowires or palladium nanoparticles are used for analytical detection of contaminants in water samples.

The impurities that nanotechnology can tackle depend on the stage of purification of water to which the technique is applied, the team adds. It can be used for removal of sediments, chemical effluents, charged particles, bacteria and other pathogens. They explain that toxic trace elements such as arsenic, and viscous liquid impurities such as oil can also be removed using nanotechnology.

"The main advantages of using nanofilters, as opposed to conventional systems, are that less pressure is required to pass water across the filter, they are more efficient, and they have incredibly large surface areas and can be more easily cleaned by back-flushing compared with conventional methods," the team says.

For instance, carbon nanotube membranes can remove almost all kinds of water contaminants including turbidity, oil, bacteria, viruses and organic contaminants. Although their pores are significantly smaller carbon nanotubes have shown to have an equal or a faster flow rate as compared to larger pores, possibly because of the smooth interior of the nanotubes. Nanofibrous alumina filters and other nanofiber materials also remove negatively charged contaminants such as viruses, bacteria, and organic and inorganic colloids at a faster rate than conventional filters.

"While the current generation of nanofilters may be relatively simple, it is believed that future generations of nanotechnology-based water treatment devices will capitalize on the properties of new nanoscale materials," the team says.

The researchers point out that several fundamental aspects of nanotechnology have raised concerns among the public and activist groups. They concede that the risks associated with nanomaterials may not be the same as the risks associated with the bulk versions of the same materials because the much greater surface area to volume ratio of nanoparticles can make them more reactive than bulk materials and lead to so far unrecognized and untested interactions with biological surfaces. Water purification based on nanotechnology has not yet led to any human health or environmental problems but the team echoes the sentiment of others that further research into the biological interactions of nanoparticles should be carried out.


'/>"/>

Contact: Alpana Mahapatra
m_alpana1@rediffmail.com
Inderscience Publishers
Source:Eurekalert

Related medicine news :

1. Gold at Forefront of Nanotechnology Revolution
2. Nanotechnology could help Arab region
3. New developments in nanotechnology tackle the 2 biggest problems associated with chemotherapy
4. Ross Nanotechnology Corporation Introduces the NeverWet™ Coating on its First Consumer Product – The Clear-n-Clean Plunger
5. Survey: Hiding risks can hurt public support for nanotechnology
6. Microfluidics Promotes Scientific University Research Using Nanotechnology with Innovation Incentives
7. Abatement Technologies Announces High-Velocity RAPTOR™ Air Movers for Water Damage Restoration Contractors
8. First Breakthrough in Water Heating Technology!
9. FriendsofWater.com Responds to the National Acadamy of Sciences Report that Millions of Americans Get Sick Yearly from Contaminated Water
10. Mouli Cohen on Innovating Israeli Water Technology
11. Angeles Launches New Portable Hot Water Sinks
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/26/2016)... ... 2016 , ... W.S. Badger Co. Inc ., the maker of certified ... Work Works Award for its use of effective workplace strategies to increase business and ... administered by the Families and Work Institute (FWI) and the Society for Human Resource ...
(Date:5/26/2016)... (PRWEB) , ... May 26, 2016 , ... ... and clinical outcomes, hosted members and suppliers for its inaugural Member Conference at ... on their mission of elevating the operational health of America’s healthcare providers. , ...
(Date:5/26/2016)... (PRWEB) , ... May 26, 2016 , ... Connor ... women’s basketball as a partner for the Tamika Catchings Legacy Tour that ... the industry leader in hardwood basketball surfaces in all forms and levels of the ...
(Date:5/26/2016)... ... May 26, 2016 , ... The Woodlands at John ... a new model of care for living and healing, celebrated its grand opening, today. ... in a Real Home provided by Empowered Staff. , “This is an incredibly fulfilling ...
(Date:5/26/2016)... (PRWEB) , ... May 26, 2016 , ... There are ... more than 32 million cancer survivors worldwide. On Sunday, June 5, 2016, communities around ... annual National Cancer Survivors Day®. , National Cancer Survivors Day® is an annual ...
Breaking Medicine News(10 mins):
(Date:5/24/2016)... 2016   , Study ... overall bowel cleansing and superiority in , ... of the ascending colon ... Norgine B.V. today announced new positive data from the ... bowel preparation) versus standard 2 litre PEG with ascorbate. The study ...
(Date:5/24/2016)... LAWRENCEVILLE, N.J. , May 24, 2016 /PRNewswire/ ... an oncology drug development company, today provided an ... Ib dose escalating clinical trial combining GEN-1, the ... for the treatment of newly-diagnosed patients with advanced ... by interval debulking surgery.  GEN-1 is an IL-12 ...
(Date:5/24/2016)... KONG , May 24, 2016 /PRNewswire/ ... COMBO ™ , la première ... des cathéters destinés à l,intervention portant sur ... (FAV)   OrbusNeich, entreprise mondiale ... permettant de changer la vie, a élargi ...
Breaking Medicine Technology: