Development nanomaterial removal toxic arsenic in drinking water

Development of nanomaterial for removal of toxic arsenic in drinking water

2:07 AM, 13th February 2012
Development of nanomaterial for removal of toxic arsenic in drinking water

SENGEN, JAPAN: Professor Dr Sherif El-Safty, Principal Researcher, Materials Recycling Design Group, National Institute for Materials Science developed a nanomaterial which enables simple detection and removal of arsenic from drinking water. This nanomaterial responds to warnings that as many as 60 million people live in contaminated areas in Southeast Asia without safe drinking water. The nanomaterial is a further developed for heavy metal ion sensors for lead (Pb), mercury (Hg), etc and adsorbent materials, which El-Safty developed previously for a rare metal adsorption/recovery materials such as cobalt (Co), palladium (Pd), etc and radioactive element adsorbents for cesium (Cs), strontium (Sr), etc.

Groundwater in Asia, South America, and Africa is now widely contaminated with arsenic. Arsenic contamination of the drinking water for 35 million people in Bangladesh is especially well known. Long-term ingestion of this water causes serious disorders of the skin, nervous system, and cardiovascular system, and can also cause health problems in the form of frequent development of cancers. Although the United Nations and the governments of individual nations have taken countermeasures over many years, it was difficult to develop an arsenic removal method that is inexpensive, simple, and easy to use in treatment of everyday drinking water.

In the developed technology, the inner walls of nanoporous substances, namely a high order mesoporous (HOM) structures, are densely packed with a functional group which is sensitive and selective for capturing arsenic. When even a trace amount of arsenic is present in water, these nanomaterial captors can quickly adsorb and remove arsenic. As a distinctive feature, the detection/removal of arsenic can easily be confirmed because the colour of the nanomaterial captors changes in the adsorption stage with the same frequency of human eyes, showing the user that the removal has occurred.

As one particular advantage of this technology, the potential use is not limited to large-volume water treatment plants. Because its features include high sensitivity, low cost, visualization of results, light weight, and high speed, it can also be used easily by individual persons. As a result, the threat of arsenic can be greatly reduced when the development of new water sources in the developing countries and elsewhere is achieved. Efforts will be made to popularize this new device in many urgent regions, as a technology that can secure the safe water on an everyday basis.

© National Institute for Materials Science News

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