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Recently, Wu Zhengyan, a researcher at the Institute of Technology Biology and Agricultural Engineering of the Chinese Academy of Sciences' Hefei Institute of Physical Science, used electron beam irradiation to prepare a novel nanocomposite photocatalyst that can rapidly degrade herbicides under visible light irradiation. This work has been received and published by the Chemical Engineering Journal.
With the rapid development of agriculture, the increasing use of herbicides will not only cause great pressure on the environment, but also endanger the health of humans and livestock. Photocatalytic degradation is one of the common methods for the treatment of herbicides. However, due to the disadvantages of the existing photocatalysts such as complicated preparation process, ultraviolet excitation, high cost, and low efficiency, it has become a bottleneck restricting the development of herbicide photocatalytic degradation technology. An efficient, low-cost, visible light-responsive photocatalyst needs to be prepared.
The research group used electron beam reduction and sputtering to successfully prepare a novel photocatalyst (MnO2/C) using potassium permanganate and modified graphite as raw materials. The results show that the catalyst has high specific surface area and strong catalytic activity, and can rapidly degrade glyphosate (a commonly used herbicide) under visible light, and reveals the degradation law and mechanism. Studies have shown that the catalyst can generate active radicals such as ·OH, ·O2-, ·HO2, etc. under the excitation of sunlight, thus rapidly degrading glyphosate into inorganic small molecules such as carbon dioxide and water.
This work was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences Green Initiative, the Chinese Academy of Sciences STS project, and the key deployment projects of the Chinese Academy of Sciences.
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