New aerogel makes water purification faster and cheaper

According to foreign media reports, it is possible to obtain pure and clean drinking water by converting liquid brine or contaminated water into steam. Now because of a newly developed material, this approach may become cheaper and easier. This material was invented by Shaobo Han, a postdoctoral student from Linköping University in Sweden. It is an inexpensive and porous aerogel composed mainly of cellulose (and air), to which an organic polymer called PEDOT: PSS is added. Thing.

Cellulose is the most abundant organic compound on earth and the main component of plant cell walls. PEDOT: On the other hand, PSS is very good at absorbing energy in sunlight-it is especially adapted to the thermal infrared spectrum of sunlight.

To allow a thin layer of aerogel to float on the surface of contaminated or salt water in a closed solar distiller, the researchers added a layer of porous foam to the bottom. Once in place, the gel absorbs water from below and absorbs solar energy from above. This causes the absorbed water to quickly heat up and become steam, which is reported to be four to five times faster than the sun directly heating the water.

Then the vapor condenses onto a flat plate above the aerogel to form pure liquid water droplets, which finally drop into the collection tank. All salt or other impurities are left in the gel, and this gel can be washed and reused many times.

"We hope and believe that our results can help millions of people who do not have access to clean water," pointed out Simone Fabiano, an associate professor who directed the study.

Related research reports have been published in "Advanced Sustainable Systems".

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