Abstract:

A composite adsorbent based on acrylic acid, acrylamide, montmorillonite and sodium humate was prepared in this work and then the effects of pH values, contact time, and initial Pb2+concentration on removing Pb2+ from the aqueous solution were evaluated. The adsorption mechanism for Pb2+ onto as-prepared adsorbent was discussed. The results indicated that under the conditions of pH 6.00, contact time of 2 h, initial Pb2+ concentration of 0.01 mol/L and amount of adsorbent of 0.10 g, the adsorption capacity of as-prepared adsorbent for Pb2+ was found to be 364.05 mg/g and the adsorption system reached equilibrium within 15 min. Compared with Ca-montmorillonite and other adsorbents reported, as-prepared composite adsorbent has higher adsorption capacity and faster adsorption rate.

Key words: composite adsorbent, montmorillonite, lead, adsorption capacity, adsorption mechanism