Long-lasting performance of high-flux perovskite membrane for catalytic degradation of organic pollutants
Jinping Liang, Kai Gao, Aijuan Zhou, Yuqiao Fang, Shengyou Su, Ling Fu, Mingchao Sun, Xiaoguang Duan
Abstract
Membrane separation for wastewater remediation has been perplexed by membrane fouling, and the design of highly antifouling membranes for high-flux operation remains challenging. Herein, Sm0.5Sr0.5CoO3-δ (SSC700) membrane was coupled with peroxymonosulfate (PMS) catalysis. SSC700 demonstrated superb efficacy in batch and fixed-bed reactions, generating sulfate radicals (SO4−•) and hydroxyl radicals (HO•) for pollutants oxidation. Additionally, in robust SSC700 membrane/PMS systems, Rhodamine B (RhB) realized > 91% removal for 50 hours from laboratory wastewater under fluxes above 368 L/(m2·h), and strikingly, ciprofloxacin, RhB and sulfamerazine in the secondary effluent attained 60-80% (50 hours), almost 100% (100 hours) and 50-60% (50 hours) removal under fluxes around 1000, 600 and 900 L/(m2·h), respectively. The highly reactive Co2+/Co3+/Co4+ redox couples accounted for the prominent activity, stability and antifouling capability of SSC700 membranes. Apart from Co species, Sm/Sr played significant roles in organics degradation. Also, bio-toxicity evolution during ciprofloxacin mineralization was monitored. This study dedicates to the design of functional membranes/PMS integrated systems for synergistic wastewater decontamination and membrane defouling.