Bromate removal by Fe(ii)–akaganeite (β-FeOOH) modified red mud granule material

Abstract

A multifunction red mud granule material was prepared and modified by Fe(II)–akaganeite (β-FeOOH), which was applied to remove bromate from aqueous solution. According to the zeta-potential, scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET) analysis, Fe(II) and akaganeite changed the zeta potentials and structural properties of the red mud granule material (RMGM), which caused Fe(II)–akaganeite/RMGM to effectively remove bromate. The results of the experiments showed that the mechanism for bromate removal contained four actions: electrostatic adsorption and ligand exchange of Fe(II)–akaganeite/RMGM with bromate, ion-exchange of akaganeite with bromate and reduction of bromate by Fe(II). The RMGM with 5.3% Fe loading exhibited the highest removal capacity.