Enhanced Arsenic Removal from Aqueous Solutions Via Magnesium Hydroxide Coated Iron Nanoparticles

For several decades, arsenic (As) contamination of water was considered as an issue of great concern. In this study, magnesium hydroxide coated iron nanoparticles (nFe⁰@Mg(OH)₂) were developed for enhancing arsenic removal from aqueous solutions. Several parameters were investigated, including Mg/Fe coating ratio, nFe⁰@Mg(OH)₂ dosage, initial pH, reaction temperature, and initial As(V) concentration. The characteristics of the synthesized materials were studied using different techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray absorption near edge structure (XANES). Results indicated the superiority of the highest Mg/Fe coating ratio (100%) to the other lower ratios in As(V) removal, corresponding to the adsorption contribution of Mg(OH)₂ coating shell. Furthermore, nFe⁰@Mg(OH)₂-100% could efficiently achieve around 100 % final As(V) removal efficiency at wide pH and