Highly efficient removal of bisphenol A by a novel Co-doped LaFeO3 perovskite/PMS system in salinity water

Although it can effectively degrade refractory organic pollutants, advanced oxidation processes (AOPs) can be seriously interfered with the co-existing substance in salinity water . Herein, three-dimensional hierarchical cobalt-doped LaFeO 3 perovskites (LaCo 0.5 Fe 0.5 O 3 ) micron spheres composed of nano-rods were hydrothermally synthesized and applied to activate peroxymonosulfate (PMS) for degrading bisphenol A (BPA). Nearly 100% BPA was removed by LaCo 0.5 Fe 0.5 O 3 /PMS system in presence of more than 50 mM Cl − within only 2 min compared that of 30 min without Cl − , which was attributed to reactive chlorine species (RCS) including Cl • and HOCl with higher oxidation capacity. •OH and SO 4 •− produced by LaCo 0.5 Fe 0.5 O 3 activating PMS played crucial roles as the source of RCS in LaCo 0.5 Fe 0.5 O 3 /Cl − /PMS system. The synergistic effect between ROS and RCS promoted by the enhanced oxygen vacancies and the efficient redox recycling of Fe III /Fe II and Co III /Co II . Other anions like SO 4 2− and NO 3 − hardly affected the BPA degradation. BPA degradation efficiency was also improved either in a wide pH range or in the presence of natural organic matters in salty water. This work also demonstrated the potential application of Fe Co bimetallic LaCo 0.5 Fe 0.5 O 3 activating PMS system for degradation of BPA or other organic micropollutants in seawater system.