Preparation of porous resin loaded with crystalline hydrous zirconium oxide and its application to the removal of arsenic

A porous resin loaded with monoclinic or cubic hydrous zirconium oxide was prepared by incorporation of ZrOCl2 . 8H(2)O into porous spherical polymer beads followed by hydrolysis and hydrothermal treatment of the zirconium sa lt. Hydrous zirconium oxide appeared to deposit inside the pores with relat ively large diameter. The adsorption capacity and distribution coefficients for As(III) and As(V) were determined by batch procedures. The hydrous zir conium oxide-loaded resin (Zr resin) showed a strong adsorption for As(V) a t slightly acidic to neutral pH region while As(III) was favorably adsorbed at pH around 9 to 10. The removal of low concentrations of arsenic from th e model effluents to meet the demand of Japanese industrial effluent standa rd (0.1 ppm) was successfully achieved by the column operation packed with the Zr resin. The Zr resin was regenerated by treatment of the column with 1 M sodium hydroxide followed by conditioning with 0.2 M acetate buffer sol ution. The amount of zirconium leached out during the adsorption and regene ration cycles was negligibly small and the column can be used repeatedly. ( C) 2000 Elsevier Science B.V. All rights reserved.