Study on the degradation of accumulated bisphenol S and regeneration of magnetic sludge-derived biochar upon microwave irritation in the presence of hydrogen peroxide for application in integrated process.

• Magnetic sludge-derived biochar offer the feasibility of an integrated process. • Ethanol-water system decouples the adsorption and degradation. • ·OH and h+ are the main active radicals involved in reactions. • Degradation and regeneration can be obtained in MW + H 2 O 2 under certain conditions. Based on the multi-functional magnetic sludge-derived biochar (MSBC), an innovative integrated process–coupling accumulation by adsorbing, degradation by microwave (MW)-induced catalytic oxidation in the presence of H 2 O 2 and the regeneration of adsorbent simultaneously, was proposed. In this study, bisphenol S (4,4′-sulfonyldiphenol) was chosen as the pollutant model, its behaviors and related mechanism of BPS and MSBC in MW + H 2 O 2 system were investigated. The BPS effective degradation on MSBC was proved by decoupling the adsorption and degradation with solvent extraction. OH and h+ play vital roles based on the scavenger tests. The synergistic effects of hot-spot of microwave irradiation, activation of H 2 O 2 , and charge transfer-induced doping effects of MSBC were attributed to the reactions. This work proves the feasibility in economics and energy-save treatment approach for low concentration organic pollutants in water. [ABSTRACT FROM AUTHOR]