Preparation and adsorption performance of polyacryloyloxytrimethylammonium chloride-modified magnetic chitosan microspheres: a novel strategy for treating Cr(vi) ion-containing wastewater

Abstract

In recent years, chromium pollution has become more and more serious, and how to efficiently dispose of chromium pollution, especially Cr(VI) pollution, has become a key issue that needs to be solved. In this study, magnetic chitosan microspheres (MCPs) were prepared by an emulsification cross-linking method, and polyacryloyloxytrimethylammonium chloride-modified magnetic chitosan microspheres (PMCPs) were successfully prepared by grafting onto the surface of MCPs through chemical modification. On this basis, the adsorption behavior of PMCPs toward Cr(VI) was systematically investigated. It was found that PMCPs were effective in removing Cr(VI) from wastewater, exhibiting a maximum adsorption capacity of 90.55 mg g⁻¹ at a pH value of 2 and an initial solution concentration of 100 mg L⁻¹. It was also found that the adsorption behavior of Cr(VI) by PMCPs conformed to the quasi-primary and quasi-secondary kinetic models, and the adsorption process was chemisorption. The adsorption regeneration experiments showed that the PMCPs possessed excellent reusability, and maintained an adsorption rate of 73.08% even after five cycles. This work provides a novel strategy for efficient disposition of Cr(VI)-containing wastewater.