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The sorption of inorganic arsenic species, As(III) and As(V), from water by   sepiolite modified with hydrated iron(III) oxide was investigated at 25 °C   through batch studies. The influence of the initial pH value, the initial As   concentrations, the contact time and types of water on the sorption capacity   was investigated. Two types of water were used, deionized and groundwater.   The maximal sorption capacity for As(III) from deionized water was observed   at initial and final pH value 7.0, while the bonding of As(V) was observed to   be almost pH independent for pH value in the range from 2.0 to 7.0, and the   significant decrease in the sorption capacity was observed at pH values above   7.0. The sorption capacity at initial pH 7.0 was about 10 mg gˉ1 for As(III)   and 4.2 mg gˉ1 for As(V) in deionized water. The capacity in groundwater was   decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and   pseudo-second order kinetic model revealed good agreement with the   experimental results. The results show that Fe(III)-modified sepiolite   exhibits significant affinity for arsenic removal and it has a potential for   the application in water purification processes. [Projekat Ministarstva nauke   Republike Srbije, br. III 45019, III 43009 i TR 37010

The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide