Orange peels biochar doping with Fe-Cu bimetal for PMS activation on the degradation of bisphenol A: A synergy of SO4•, •OH, 1O2 and electron transfer

Recently, the usage of biomass wastes has attracted considerable attention, especially in water purification. Herein, the modified orange peels biochar with Fe-Cu bimetal (FeCu/OPB-1) was prepared by one-step carbonization for activating peroxymonosulfate (PMS) to remove bisphenol A (BPA). The prepared FeCu/OPB1 could degrade 90% of BPA by activating PMS at pH 5.2-9.0. HCO3  could significantly enhance BPA degradation and reduce the amount of leached metal ions. SO4 & BULL; and & BULL;OH were produced on the surface of FeCu/OPB1, and the catalytic process was demonstrated to take place primarily on the catalyst surface. One of the main reactive oxygen species (ROSs) identified was 1O2. Moreover, Fe-Cu bimetal and the C = O functional group on FeCu/OPB-1 accelerated the electronic migration in the activation process. Relying on the produced intermediates, three feasible degradation pathways were suggested. Besides, further insight into the use of OPBbased catalysts for the degradation of organic pollutants was hereby provided through the activation of PMS.