Tencent Digital (Wang John) imagines that when drinking water, there is a small bark in the cup, maybe an insect, but this is a micro-water purifier driven by solar energy.
The device was developed by the US Department of Energy's SLAC National Accelerator Laboratory and a research fellow at the Stanford University's School of Materials and Energy. Its size is only 1 x 2 centimeters, and it is about the size of a half-stamp. By using visible light from the sun, it can quickly purify existing water resources.
This invention can help outdoor enthusiasts and people in developing countries to quickly purify water resources without using energy, without boiling water, and without using rechargeable UV rods.
There were also some devices that used sunlight to purify water, but they could only use UV disinfection. Although it is a portable device, it takes hours or even days for the water to purify, thus reaching the standard of solar water source disinfection measures of the Swiss Federal Institute of Aquatic Science and Technology. Stanford University water purifiers only need a few minutes to complete the water purification.
At present, about 663 million people in the world do not have access to pure drinking water. According to statistics from the United Nations, about 1,000 children die every day from diseases related to drinking water hygiene. These diseases can be prevented.
Liu Chong, a postdoctoral researcher at Stanford University, said: "Ultraviolet rays only account for about 4% of sunlight's energy. If visible light is used, 50% of solar energy will be used, and it will be completely free. So why not use more solar energy? For water disinfection, this will use more light and be more efficient."
The report appeared in the "Nature Nanotechnology" magazine published on Monday. A small glass bottom plate has molybdenum disulfide “nanosheets†placed on top of each other. Each nanosheet is covered with a thin layer of copper that can kill microbes under the right conditions. chemical reaction. Under sunlight, molybdenum disulfide and copper become catalysts that form hydrogen peroxide or other chemical disinfectants in water. Once you kill all the bacteria, the chemicals will automatically dissipate and there will be nothing but pure water.
This water purifier has achieved practical results. In the control experiment, this solar water purifier can kill 99.999% of bacteria in 25 ml of wastewater within 20 minutes. The device can adjust the size of the finished product according to the amount of water that needs to be processed. The cost is only a few dollars. Liu Chong also said that researchers are now conducting tests on the ground and hope that it can achieve commercial production in the next 3-5 years.
Speaking of the drawbacks of this type of water purifier, this water purifier currently only eliminates E. coli and Lactobacillus from the water. It cannot remove viruses and harmful chemicals such as lead, but the team plans to test it later. Try to eliminate other pollutants in the water.
Liu Chong said: "We can purify any outdoor water, as long as the water is not particularly turbid or heavily polluted, but it contains harmful microorganisms. Simply pour the water into the equipment to kill the bacteria."
Source: cnet
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