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Purifying water using sunlight

New technology that uses the sunlight to purify water with near-perfect efficiency has been developed

: Scientists have developed a new technology that uses the sunlight to purify water with near-perfect efficiency.

By draping black, carbon-dipped paper in a triangular shape and using it to both absorb and vaporise water, researchers have developed a method for using sunlight to generate clean water with near-perfect efficiency.

“Our technique is able to produce drinking water at a faster pace than is theoretically calculated under natural sunlight,” said Qiaoqiang Gan, an associate professor at the University at Buffalo in the US.

The low-cost technology, described in the journal Advanced Science, could provide drinking water in regions where resources are scarce, or where natural disasters have struck. The technique has many advantages. It is simple, and the power source - the sun - is available just about everywhere. However, even the latest solar still models are somewhat inefficient at vaporizing water. “Most groups working on solar evaporation technologies are trying to develop advanced materials, such as metallic plasmonic and carbon-based nanomaterials,” Gan said. “We focused on using extremely low-cost materials and were still able to realise record-breaking performance,” he said.PTI



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