Research Description
Transition metals are usually applied for activating persulfate to degrade organic contaminants efficiently, and there are numerous researches utilizing bimetallic catalysts to harvest the higher performance. Mechanisms of reactive oxygen species (ROS) generation as well as the mutual transformation of bimetal have been reported a lot, yet the deviation of ROS contribution for contaminants degradation and the relevant role of metals seem to be explored deficiently. Herein, biochar decorated with bimetal of Co/Fe (Fe1/4Co1/2-PWBC600) was prepared for peroxymonosulfate (PMS) activation and oxytetracycline (OTC) degradation, and properties of catalysts were analyzed for elaborating the intrinsic difference of ROS generation. Results showed that the structure of ROS contribution was optimized in Fe1/4Co1/2-PWBC600/PMS system, and the co-dominance of SO4•‒ and 1O2 realized the better OTC degradation performance compared with the merely cobalt-based catalyst. Besides, durability tests showed that Fe1/4Co1/2-PWBC600 performed much better in oxidation resistance and reusability, which was owing to the co-dominance effect and the consumption buffering of oxygen vacancies. This work offered a new insight into the synthesis of bimetallic catalysts to strengthen the properties pertinently, realizing the higher performance of pollutants degradation and catalyst lifetime.
