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

A multifunction red mud granule material was prepared and modified by Fe(II)-akaganeite (b-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.