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Recently, scientists from the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, have developed a novel photoelectrode material capable of directly sterilizing water using sunlight. This groundbreaking research was recently published in the journal "Catalysis Today," marking an important step forward in sustainable water purification technologies.
Photocatalytic technology using semiconductors has long been considered one of the most promising methods for water treatment due to its low cost, eco-friendliness, and high efficiency. However, the most commonly used photocatalyst, titanium dioxide (TiOâ‚‚), is only activated by ultraviolet light, which makes up just about 5% of the total solar spectrum. This limitation has driven researchers to explore ways to enhance TiOâ‚‚'s ability to absorb visible light, thereby enabling it to work efficiently under natural sunlight or artificial lighting sources like fluorescent lamps.
Under the supervision of Professor An Taicheng and Researcher Li Guiying, doctoral student Nie Xin from the Guangzhou Institute of Geochemistry successfully synthesized a new type of nitrogen-doped carbon-polymer-loaded titanium dioxide composite photoelectrode. The synthesis process involved a simple hydrothermal-calcination method, using titanium and melamine as precursors.
The composite electrode consists mainly of carbon, peptides, oxygen, and a small amount of nitrogen. It also contains numerous carboxyl, amino, and hydroxyl groups, which significantly improve the interaction between the nitrogen-doped carbon polymer and titanium dioxide. This enhances the absorption of visible light and facilitates efficient electron transfer. Testing showed that the composite photoelectrode exhibits rapid photoelectrocatalytic bactericidal activity against *E. coli* under visible light. These findings offer valuable theoretical insights and experimental support for the development of next-generation visible-light-responsive catalysts, with potential applications in environmental protection, particularly in drinking water disinfection and purification.
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