Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method

► Ultrafine α-Fe2O3 nanoparticles were synthesized by the solvent thermal process. ► Combination of a large surface area and the existence of surface hydroxyl groups. ► Strong adsorption for both As(III) and As(V), especially at low equilibrium arsenic concentrations. ► Effectively removal of most arsenic contaminations from natural water samples without pre-treatments.