RemoVal of As(V) from Drinking Water by Attapulgite Loaded with Fe(III) Adsorbent

摘要

An effective adsorbent for the removal of arsenate from aqueous system was synthesized by loading ferrihydrite on attapulgite (ATP). The effects of Various parameters such as heat modified temperature and particle size of ATP, Fe(III) concentrations, adsorbent dosage, solution pH on the removal rate of arsenate were assessed. The results showed that 600°C modified ATP loaded with Fe(III) sorbent had better arsenate removal efficiency than 200°C and 400°C modified ATP. The removal efficiency of As(V) increased significantly with decreasing the particle size of ATP. Arsenate was effectively adsorbed by ATP loaded with Fe(III) sorbent in the pH range of 5-7. Equilibrium data of arsenic adsorption fitted perfect with Langmuir isotherm model. The removal rate of As(V) by ATP loaded with Fe(III) sorbent was 95.8% at the optimal conditions from drinking water. The results showed that ATP loaded with Fe(III) sorbent can be used for the arsenate removal from aqueous system.