Silver nanoparticles provide clean water for $2 a year

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Silver nanoparticles provide clean water for $2 a year

New Scientist
Magazine issue 2916
May 10, 2013

Sometimes the solution to an enormous problem is tiny.
Silver nanoparticles may be the key to supplying clean,
affordable drinking water worldwide.

Thalappil Pradeep at the Indian Institute of Technology
in Chennai and colleagues have developed a filter based
on an aluminium composite, embedded with silver
nanoparticles. As water flows through the filter, the
nanoparticles are oxidised and release ions, which kill
viruses and bacteria, and neutralise toxic chemicals such
as lead and arsenic.

Some nanoparticles leach into the water but at
concentrations that pose no threat to health. Pradeep
describes the process of making the filter as "water
positive": 1 litre of water spent on making nanoparticles
gives 500 litres of clean water.

In tests, a 50-gram composite filtered 1500 litres of
water without needing reactivation, so they estimate that
a 120g-filter that costs just $2 would provide safe
drinking water for a family of five for one year (PNAS,
DOI: 10.1073/pnas.1220222110).

The filters are undergoing field trials in India with the
aim of preventing waterborne diseases.

More at:

http://www.newscientist.com/article/mg21829165.400-silver-nanoparticles-provide-clean-water-for-2-a-year.html

Jai Maharaj, Jyotishi
Om Shanti

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