Application of Fe-Nanoscale Materials Useful in the Removal of Arsenic from Waters

摘要

Two iron minerals (akaganeite and magnetite) were synthesized according to standard procedures and nanosized particles were obtained. The minerals were tested for their ability to remove As from water streams at pH value 3.5, with and without electrolyte (0.1 M conc.). Their capacities were calculated to 50 and 30 mg As/g of solid for akaganeite and magnetite, respectively. The sorption isotherms were modeled with Freundlich and Langmuir equations and good agreement was observed. Zeta potential studies have shown that both minerals sorbed As specifically, probably due to chemical forces between As oxyanions and surface Fe.