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Tuning Redox Reactions via Defects on CoS2-x for Sustainable Degradation of Organic Pollutants.
Angewandte Chemie 2020 October 24
Compared with adding a large amount of H 2 O 2 artificially to the traditional advanced oxidation system, it is particularly important to develop self-producing reactive oxygen species (ROSs) system and maintain the continuous and effective degradation of organic pollutants. Herein, for the first time, a system of ultrasound-treated CoS 2-x mixed with Fe 2+ is constructed to sustainably release singlet oxygen ( 1 O 2 ) for the effective degradation of various organic pollutants, including dyes, phenols and antibiotics. Ultrasonic treatment can produce a large number of defects on the surface of CoS 2 , which promote the production of ROSs and the circulation of Fe 3+ /Fe 2+ . With the help of Co 4+ /Co 3+ exposed on the surface of CoS 2-x , the directional conversion of superoxide radical ( · O 2 - ) to 1 O 2 is realized. The CoS 2-x /Fe 2+ system can degrade organic pollutants efficiently for up to 30 days, which is significantly better than the currently recognized CuP x system (<3 days). Therefore, CoS 2-x provides a new choice for the long-term remediation of organic pollutants in controlling large area river pollution.
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