Adsorption and Coprecipitation of As(V) from Aqueous Solutions by Aluminum Hydroxide

The effects of solution pH and initial concentration on adsorption and coprecipitation of As(V) from aqueous solutions by aluminum hydroxide [Al(OH)3] for 50d and 1120d were studied. The XRD, FT-IR and SEM results indicated that there was only slight difference between the Al(OH) 3 adsorbents before and after adsorption, but their crystal structure had not changed. The adsorption efficiency of As(V) onto Al(OH) 3 increased with the increasing pH when pH9, the adsorption efficiency decreased with the increasing pH. For the initial As(V) concentration Co=0.1 or 0.01 mmol/L, the adsorption efficiency exceeded 99% at pH 6-9 after 50d or 1120d reaction, but the As(V) concentration in the solution after adsorption for 1120d was higher than that for 50d.