Comprehensive spectroscopy studies of photoelimination process of toxic metals ions from aqueous solution by using CdS and CdS@magnetized powder activated carbon assisted magnetic stir bar.

Abstract

In this study, a simple and novel photocatalytic tool was proposed and developed for photoelimination of toxic metal ions in aqueous solution. CdS quantum dots capped with thioglycolic acid and CdS @ magnetized powder activated carbon (CdS@MPAC) fixed on magnetic stir bar was constructed and applied for photoelimination of toxic metal ions in aqueous solutions. The production and contribution of hydroxyl (OH) and superoxide (O2-) species generated during photoelimination process were investigated. The photoelimination of Cd(II), Co(II), Cu(II), Mn(II), Ni(II) and Pb(II) metal ions was performed at neutral pH (7.0 ± 0.1) with the same experimental circumstances. Maximum removal efficiency was achieved with 0.360 M of CdS@MPAC under 3.0 h daylight irradiation. Photoelimination mechanisms of Cu2+ with CdS QDs were also investigated. Finally, this method was successfully applied for elimination of toxic metal ions from real sample.