Preparation of iron-copper binary oxide and its effective removal on antimony(Ⅴ) from water

摘要

Fe-Cu binary oxides with different Fe/Cu molar ratio were synthesized via a facile co-precipitation process and their performance on Sb(V) removal was systematically evaluated. It demonstrated that as-prepared binary oxides possessed better Sb(V) adsorption capacity than both iron oxide and copper oxide. Moreover, the optimum Fe/Cu molar ratio for binary oxides was about 3/1. Sb(V) adsorption on the Fe-Cu binary oxide did follow a pseudo-second-order kinetic model, indicating that chemical sorption played a major role. The adsorption isotherm data gave better fit to the Freundlich model. Furthermore, the Fe-Cu binary oxide showed an adsorption capacity of 191.9mgg(-1) at pH 6.0, which was higher than that of many other adsorbents. Coexisting anion and obviously inhibited the Sb(V) removal. In addition, Sb(V) adsorption on the Fe-Cu binary oxide was favorable under acidic condition. Little of Fe and Cu ions were released to water in pH range of 6.0-9.0. After reaction, the morphology of Fe-Cu binary oxide did change significantly and the surface complex was produced.