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Pacific Security Network News ]
Water purification technology characteristics of nano water purifier
According to a recent report by the American Physicist Organization Network, researchers at Stanford University have immersed a common cotton yarn in a mixture of silver nanowires and carbon nanotubes to make a new and efficient water purification filter. Killing 98% of the bacteria in the water, the sterilization speed is 80,000 times that of the traditional microporous mesh filter. The research results were published in the recently published Nano Express magazine.
Carbon nanotubes have good electrical conductivity, and more than 98% of Escherichia coli is killed by a few seconds in a current of 20 volts. Silver can also be sterilized. Before the appearance of pasteurization and refrigerators, people often put a silver coin at the bottom of the milk bottle to disinfect.
Sarah Haiershawn of the Stanford University Materials Research Bioengineering Expert Group said that the two-material combination of carbon nanotubes and silver "hands-on" filters maximizes germicidal efficacy. The silver nanowires are capable of killing any bacteria that are trapped in the pores, thus avoiding the major drawback common to conventional filters, where bacteria form biofilms on the filter and foul the equipment.
Traditional filters use physical methods to absorb bacteria, while the new filter contains cotton fibers wrapped in a "nano jacket" that creates an electric field that kills the bacteria that flow through it, and the cotton fibers are multi-layered and thick. Up to 6.4 cm, enough to kill most of the bacteria in the water.
Cui Yi, an associate professor of materials science and engineering at Stanford University, said the cost of the new filter is also low. On the one hand, silver nanowires use very little silver and the cost is almost negligible. On the other hand, the required current is small. The nanomaterial has high adsorption capacity. The longer end of the silver nanowire is connected with the nanotube, and the other end is inserted into the gap between the cotton fibers. A smooth and gap-free coating is formed on the cotton fiber, and the conductive effect is good. Therefore, the current intensity is only a few milliamps, and a small solar cell or a pair of 12 volt car batteries can be satisfied. The traditional filter uses an electric pump to pump water into the micropores, which consumes a large amount of electricity and filters the same amount of water in the laboratory. The new filter consumes only one-fifth the power of the conventional filter.
Cui Yi also said that the new filter is very fast. The filter pores of the traditional filter are very small, and it is easy to block the micropores when the bacteria are adsorbed and separated from the water. The new filter has a relatively large pore size and only kills the bacteria but does not adsorb the bacteria, so the speed of the water flow is not slowed down. The water speed is 80,000 times that of conventional filters. This filter is practical in remote areas where chlorine cannot be used to sterilize water, which can greatly reduce the spread of diseases such as cholera, typhoid and hepatitis that spread through water.
The researchers plan to develop filters for filtering different types of bacteria and test multiple combined filters.
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Parking lot lighting is the lighting equipment and program installed in the parking lot. Parking lot lighting is designed to provide enough light to ensure the safety of parking lot users and to ensure that they can clearly see vehicles, pedestrians and other obstacles.
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