Degradation of bisphenol A through Ti–BiOI/ZIF-8/peroxymonosulfate (PMS): Catalyst preparation, experimental design and catalytic mechanism

Abstract

In this work, zeolitic imidazolate framework-8 (ZIF-8) was loaded onto Ti-modified BiOI (Ti–BiOI) by in-situ synthesis to prepare novel binary photocatalytic materials (Ti–BiOI/ZIF-8), its physical parameters, chemical parameters, crystal structure and electrochemical properties were characterized. A novel photocatalytic oxidation system (Ti–BiOI/ZIF-8/PMS/Vis) consisting of Ti–BiOI/ZIF-8 and peroxymonosulfate (PMS) could efficiently remove BPA under visible light. In the first 2 ​min of the photocatalytic reaction, Ti–BiOI/ZIF-8 and PMS were excited to generate a large number of active groups (•O2−, •OH, •SO4− and h+), more than 90% of BPA was removed, and the degradation rate of Ti–BiOI/ZIF-8/PMS/Vis was 3.5 times higher that of monomer BiOI, and the removal rate of total-organic-carbon reached about 60%. In addition, the effects of PMS dosage and catalyst dosage on the removal of BPA were also investigated. The stability and reusability of the Ti–BiOI/ZIF-8 were verified through four cycles of degradation of BPA.