Optimized Preparation of Directional Modified Attapulgiteand its Application to Adsorbance of Humic Acidin Polluted Raw Water Effluent

Abstract

Natural attapulgite modified using acid activation, heat treatment, and organicmodification was investigated as a humic acid adsorbent and an optimal modificationmethod was confirmed. Results suggest that acid activation should be performedfirst and followed by organic modification. Optimum dosage of modified attapulgite was0.7 g/L and the humic acid removal rate reached 97%. Optimum modification conditionswere as follows: acid concentration at 3 mol/L, sodium chloride concentration at 0.5mol/L, sodium treatment duration was 2 h, modifier amount was 3%, and microwavemodification time was 9 min. Modified attapulgite prepared as such may be beneficial forwater treatment processes.