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research team from Southwest Petroleum University in Sichuan Province
has developed a low-cost, high-efficiency photocatalyst that uses
visible light to purify water.
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A photocatalyst is a substance that can help cause a light-catalyzed
reaction, such as chlorophyll capturing sunlight to turn water and
carbon dioxide into oxygen and glucose in photosynthesis.
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Ordinary photocatalysts can decompose organic pollutants in sewage under
ultraviolet light, which, however, only accounts for four percent of the
solar spectrum, making this type of sewage treatment costly and
preventing it from widespread application.
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The research team of eight doctoral students turned to visible light, a
spectrum accounting for 43 percent of sunlight. After four months of
research, they developed a new photocatalyst Reac-O2 with good visible
light absorption performance.
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O2¡£
Reac-O2 can produce reactive oxygen species, purifying water by
degrading organic pollutants into non- or low-toxic small-molecule
substances.
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In experiments, the new photocatalyst performed more efficiently than
traditional sewage treatment agents. "The amount of water that used to
be purified with one hour now can be purified in just 30 minutes," said
Shi Xian, head of the research team.
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Reac-O2 can be recycled at least 30 times and maintain a degradation
rate of 85 percent.
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Using Reac-O2 to purify a ton of sewage will cost five yuan (0.73 US
dollars) while using traditional technology costs 17 yuan, said Shi.
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The photocatalyst has brought the research wide acclaim and a host of
accolades, as well as market favor. Two companies in Chengdu have put
forward intentions to cooperate with the team.
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"It will be in the market within two years," said Shi.
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À´Ô´:CGTN
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