LAUSR

Abstract In this study the layered double hydroxide (LDH) with Mg:Al molar ratio of 2:1 synthesized using co-precipitation method was impregnated with iron oxide particles (10 and 25 wt% loading). The calcined and uncalcined composites application for As(V) removal from aqueous solutions was studied. The XRD, Mossbauer spectroscopy, SEM and vibrating sample magnetometry studies confirmed the presence of superparamagnetic maghemite (γ-Fe2O3) particles having the size of ∼30 nm on the LDH surface. The FTIR studies revealed co-intercalation of carbonates and sulfates in the interlayer space of LDH. The composites showed outstanding As(V) adsorption properties. For the calcined composites a slightly higher adsorption capacity was observed which was connected with incorporation of As(V) anions into interlayer space during LDH structure reconstruction. Moreover the experiments of As(V) removal at low concentrations (3.75–0.37 mg/L) showed high selectivity and efficiency in As(V) removal, when LDH was impregnated with iron oxide particles (