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    Healthy You: Solar power to your rescue to kill bacteria?


    Isn’t it the time to make better use of natural resources become more healthy. Here is an exciting development about a new system of solar power kills bacteria super fast. Researchers in Stanford university discovered nanomaterial that can kill 99.999% of bacteria in water within only 20 minutes. Now we all can hope that the next generation of humans will be healthier, Thanks to this invention by stanford researchers.



    Researchers at the U.S. Department of Energy’s SLAC National Accelerator Laboratory and Stanford University have found another solution for achieving water purification that is related to solar disinfection. The team has discovered a nanomaterial that can kill 99.999% of bacteria in water within only 20 minutes, significantly improving on the standard model of purifying water through UV, which requires two days. The older methods using UV are slower due to the fact that they account for only about 4% of total solar energy focused on water being irradiated while the new experiments focused on increasing this energy.

    To make use of the entire visible solar spectrum, researchers aligned molybdenum disulfide (MoS2) films vertically on the surface of a glass pane. Appearing like fingerprints on the glass and including closely spaced lines, the chemical rows enabled the tiny device to absorb 50% of the sun’s energy. The device already surpasses abilities of UV-only systems, as it also employs the full spectrum of visible light.

    The purification process begins when researchers place a thin layer of copper on top of MoS2 walls to produce a photocatalyst that is triggered when sunlight reaches the device. The catalyst sets off a chemical reaction that generates bacteria-killing “reactive oxygen species.” Because MoS2 is inexpensive and easy to make, this breakthrough could apply well to similar devices targeted for use in developing countries.

    Scientists have concluded that the structure would not rid of any and all water pollutants, failing to remove chemical impurities. It has already been tested on three strains of bacteria, which were only mixed with bacteria and not actual contaminants.

    “It’s very exciting to see that by just designing a material you can achieve a good performance,” said Chong Liu, lead author of the study. “Our intention is to solve environmental pollution problems so people can live better.”

    More: here