Novelty carbon-based Fe-S-Mo catalyst to achieve adsorption oxidation cooperative reinforcement for Fenton-like reaction

The key to ensure drinking water safety is efficient and continuous water purification. Fe Mo bimetallic catalysts have attracted much attention because of high efficiency, recyclability and environmental friendliness in Fenton-like process. Herein, we obtained a novelty carbon-based ferric molybdenum sulfide bimetallic catalyst as FeMoS x @C through hydrothermal process and high temperature incineration at H 2 Ar atmosphere with Prussian blue as a crystalline core and sodium molybdate, thiourea and glucose as precursors, which had a special functionally zoned structure including biochar with lots of -CN, -CH and -OH groups as the main absorption sites, ferric molybdenum sulfide composite as the main catalytic sites. Synchronous and asynchronous adsorption oxidation experiments proved that the biochar sites absorbed and enriched the EPs, and the catalytic sites acted with PMS to produce ROS, which immediately degrade the EPs absorbed by the biochar sites, thus realizing the cooperative reinforcement of adsorption oxidation process. Therefore, the degradation efficiency of atrazine can reach 100 % within 8 min. In the degradation process, sulfur and molybdenum in the catalytic sites could promote the cycling of Fe (II) and Fe (III) with action of PMS to produce ROS. In FeMoS x @C, Fe was the active center, where sulfur and molybdenum could promote the cycling of Fe (II) and Fe (III) to produce ROS. The evaluation of cycle performance and the stable operation of water purification device showed that FeMoS x @C/PMS system had broad prospects for treating actual wastewater. This study verified the feasibility of fractional adsorption oxidation, and provided ideas for rational system design of sustainable water purification to ensure drinking water safety. • Iron‑molybdenum bimetallic sulfide coated by carbon yolk-shell microspheres was successfully synthesized. • Adsorption and degradation were achieved in different sites and synergistically improved the degradation efficiency. • The sulfur and molybdenum in the catalyst contributed to the self-cycling of Fe (II) /Fe (III). • Free radical and non-free radical systems achieved efficient water purification.