Synthesis of poly(AA-co-AMPS)/montmorillonite composite and its application in Pb2+-adsorption behavior
ZHANG Guochun*, GONG Wei, LI Meilan, LIU Jianlin, ZHANG Jing, YAO Dan
(Shaanxi Key Laboratory of Tailings Comprehensive Utilization of Resource, College of Chemical Engineering and Modern Materials, Shangluo University, Shangluo 726000, Shaanxi, China)
Abstract:
Based on in-situ polymerization, the P(AA-co-AMPS)/MMT composites were prepared,and FT-IR, XRD, TG and SEM were employed to characterize their structure. Moreover, the adsorption behavior of Pb2+ by P(AA-co-AMPS)/MMT composites was also studied. The results indicated that the MMT was grafted onto the networks of P(AA-co-AMPS) and the composites with better heat stability was obtained.Compared to the P(AA-co-AMPS) material, due to the addition of montmorillonite, P(AA-co-AMPS)/MMT composite had larger specific surface area and adsorption sites.Under the conditions of pH=5.0, contact time of 100 min, an initial Pb2+ concentration of 0.01 mol/L and an amount of P(AA-co-AMPS)/MMT composite of 0.10 g, the adsorbent capacity of P(AA-co-AMPS)/MMT composite for Pb2+ was found to be 388.7 mg/g. The adsorption of Pb2+ conformed Langmuir isothermal adsorption model. Compared with montmorillonite reported, the as-prepared composite adsorbent had a higher adsorption capacity.
KeyWords:
polyacrylic acid; montmorillonite; composites; adsorption behavior; lead ion
