Evaporative water purification is an ancient technology, but a research team at the University of Science and Technology of China, however, came up with a new plan for purifying drinking water using sunlight, wood and bacteria. It is reported that this new set of equipment made of wood can use bacteria to build key nanostructures. When sunlight gathers on the device, the heated liquid water will evaporate faster. Water vapor can be directed to another separate container to condense into clean drinking water again, but other harmful contaminants will be left behind.
(From: ACS)
We have seen water purification solutions based on various materials and configurations before, such as absorbing water below by machines floating on the lake, foam sponge made of graphene, and made of carbon-impregnated paper and cellulose aerogel Solar still, etc.
However, the new water purifier of the research team of the University of Science and Technology of China is equipped with a light-absorbing carbon nanotube on the top of the multilayer structure, a heat-insulating glass bubble in the middle, and a wood bottom layer floating on the water. But the key ingredient in this package is bacteria that are not visible to the naked eye.
The research team first applied fermentation on the surface of the wood, and then when adding glass bubbles and carbon nanotubes, the bacteria would build cellulose nanofibers around them, thereby joining the whole thing together.
This natural porous structure design can help the wood keep moisture and transport it upward. When it reaches the top of the light-absorbing carbon nanotube layer, it will be heated and evaporated. At the same time, the glass-like aerogel layer can play a role of heat insulation to prevent the heat from radiating downward.
The research team claims that this solar evaporator solution is more effective than most designs, with an evaporation rate of 2.9 kg/m3/h and a solar conversion rate of 80%. In addition, wood and carbon nanotube materials are quite rich and affordable.
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