P(AA-co-AMPS)/MMT复合材料的制备及其对Pb^2＋的吸附行为

Synthesis of poly(AA-co-AMPS)/montmorillonite composite and its application in Pb^(2+)-adsorption behavior

基于原位聚合的方法,制备了一种具有网络结构的P(AA-co-AMPS)/MMT复合材料,通过FT-IR、XRD、TGA和SEM对其结构进行了表征,探究了P(AA-co-AMPS)/MMT复合材料对Pb^(2+)的吸附特性。结果表明:MMT已成功接枝于P(AA-co-AMPS)聚合物中,形成了热稳定较好的复合物;相比于P(AA-co-AMPS)聚合物而言,MMT粒子的引入使得P(AA-co-AMPS)/MMT复合材料具有更大的比表面积和吸附位点。在pH=5.0、吸附时间100min、Pb^(2+)溶液初始浓度0.01mol/L和P(AA-co-AMPS)/MMT用量0.10g的条件下,复合材料对Pb^(2+)的吸附量达到388.7mg/g,且吸附过程符合Langmuir等温吸附模型。与蒙脱土相比,P(AA-co-AMPS)/MMT复合材料具有更高的吸附容量。

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 Pb^2＋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 Pb^2＋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 Pb^2＋was found to be 388.7 mg/g.The adsorption of Pb^2＋conformed Langmuir isothermal adsorption model.Compared with montmorillonite reported,the as-prepared composite adsorbent had a higher adsorption capacity.