Defects on CoS_2−<i>x</i>: Tuning Redox Reactions for Sustainable Degradation of Organic Pollutants

Abstract It is important to develop self‐producing reactive oxygen species (ROSs) systems 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 produces 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 (&lt;3 days). Therefore, CoS 2− x provides a new choice for the long‐term remediation of organic pollutants in controlling large area river pollution.