According to foreign media reports, researchers at the University of Maryland have used carbonized wood to achieve an efficient and affordable light and hot water purification device. Now the new water purification system from the University of Texas at Austin provides improved performance and replicates the structure of roses.
A team led by Donglei (Emma) Fan, associate professor at the University of Texas at Austin, began using round paper sheets coated with black polymers (called polypyrroles)-polymers that convert sunlight into heat. Although these papers initially showed prospects involving solar steam generation technology, although they are not efficient in practical applications.
Inspired by a book she read "Black Tulip", Emma began to try to place multiple sheets of paper in a rose petal arrangement in a glass jar. The contaminated water is then drawn into it through a tube, which extends down into the container below.
It was found that this setting allowed more sunlight to illuminate the polypyrrole, as light that was not absorbed by one piece of paper was reflected onto another piece of paper. In addition, the surface area where water vapor is dissipated is increased.
Therefore, the rose-shaped solar steam plant can now obtain more than 1.9 liters of purified water per hour using 1 square meter of material. Any heavy metals or bacteria present in the contaminated water will be left behind when converted into steam, and will be left with any salt present in the sea water. The cost of the technology is also very low because the cost of each structure is less than 2 cents. In contrast, researchers say that other solar steam systems tend to be costly, bulky, and produce relatively little clean water.
"Our rational design and low-cost manufacturing of 3D origami photothermal materials represent the first portable low-pressure solar steam collection system," said Weigu Li, a PhD candidate and the first author of the research paper. "This can inspire new examples of solar steam technology in clean water production for individuals and households."
The paper was recently published in the journal Advanced Materials.
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