Efficient Removal of Cadmium (II) and Arsenic (V) from Water by the Composite of Iron Manganese Oxides Loaded Muscovite

Abstract

It is a great challenge for a material with high adsorption capacity for cadmium (Cd) and arsenic (As) simultaneously. To address the simultaneous removal of Cd and As from water and the utilization of waste muscovite, the muscovite-supported iron manganese oxides (FMM) were prepared. The FMM was easy to adsorb Cd(II) and As(V), and the adsorption capacity of Cd(II) and As(V) was 32.47 mg/g and 28.57 mg/g, respectively. Iron manganese oxides significantly improved the Cd(II) and As(V) adsorption capacity, specific surface area, and pore volume of the material. Moreover, the adsorption process of FMM for Cd(II) and As(V) fitted well with the pseudo-first-order model and pseudo-second-order model. The mechanism including chemical adsorption, electrostatic adsorption and covalent bond adsorption was proposed for As(V) removal, while Cd(II) removal was based on the combination of electrostatic adsorption and surface precipitation. In conclusion, FMM is a promising material for the treatment of As and Cd-contaminated wastewater, which provides insight into the resource utilization of waste muscovite.