Activation of peroxymonosulfate by N, S co-doped magnetic FeCoS for the degradation of ciprofloxacin hydrochloride: Catalytic performance and mechanism

Abstract

A variety of metal-doped sulfide catalysts with a wide pH application range have a good prospect for activated persulfate removal of pollutants in water. In this article, a microwave-assisted vulcanization method has been utilized to prepare nanoparticles with magnetic properties of FeCoS. It improves the material preparation efficiency and greatly reduces the experimental energy consumption. FeCoS/PMS system has good degradation performance for ciprofloxacin hydrochloride (CIP in the wide pH range of 3–11). The synergistic action of iron and cobalt ions is the main activation mechanism. Compared with single metal-doped sulfide, the recombination of two metals increases the number of electron transfers for enhanced the possibility of breakage of O–O bond in PMS. It makes the catalyst many times more effective in removing pollutants. Stability and recovery experiments show that the FeCoS composite maintains a high catalytic effect under multiple cycles and that the magnetic material can be quickly separated and recovered. And the degradation rate of other typical pollutants can reach more than 90%, showing high degradation performance in the actual waste sample.This study offers a new strategy for the simple development of magnetic and easily recyclable multi-performance catalytic materials and demonstrates their potential application in the degradation of organic pollutants.