聚吡咯/蒙脱土吸附材料的合成制备与性能表征

Investigation on Preparation and Properties of PPy-MMT Composite Adsorption Materials

在不同的引发体系下采用氧化还原聚合法制备了聚吡咯-蒙脱土的三种吸附材料:过硫酸盐引发聚吡咯-蒙脱土(AP-PPy-MMT)、过氧化环己酮引发聚吡咯-蒙脱土(CP-PPy-MMT)、三氯化铁引发聚吡咯-蒙脱土(FC-PPy-MMT)。采用XRD、FT-IR、TG等手段对制备的吸附材料的结构与组成进行了表征;选用刚果红染料作为吸附介质进行了吸附实验。XRD表明聚合反应只改变了蒙脱土的层间结构;FTIR测试表明吡咯单体发生了聚合反应,生成了聚吡咯,聚吡咯-蒙脱土的比表面与孔结构:AP-PPy-MMT、CP-PPy-MMT和FC-PPy-MMT的比表面分别为9.63 m2/g,16.81 m2/g,18.03 m2/g;孔容分别为0.027 cm3/g,0.044 cm3/g,0.037 cm3/g;孔径分别为86.50 Å,104.89 Å,82.26 Å。通过聚吡咯-蒙脱土吸附材料对刚果红溶液吸附动力学和吸附热力学研究,确定了染料刚果红的分子与聚吡咯-蒙脱土吸附材料对刚果红溶液的吸附均符合准二级动力学方程,呈单分子层型吸附,且其吸附量随温度的升高而升高。

FC-PPy-MMT, CP-PPy-MMT, AP-PPy-MMT, which are three kinds of PPy-MMT composite adsorption materials, were prepared by REDOX polymerization. The composite adsorption materials were characterized by XRD, FT-IR, and TG. Adsorption experiments were carried out using Congo red dye as the adsorption medium. XRD showed that the polymerization changed only the interlayer structure of montmorillonite;FTIR test showed that the pyrrole monomer was polymerized to form polypyrrole. The result indicated that the surface of AP-PPy-MMT, CP-PPy-MMT and FC-PPy-MMT are 9.63 m2/g, 16.81m2/g, 18.03 m2/g;the pore volumes are 0.027 cm3/g, 0.044 cm3/g, 0.037 cm3/g;the aperture are 86.50 Å, 104.89 Å, 82.26 Å. Results indicated that the primary mechanism for Congo red adsorption on PPY-MMT was chemical monomolecular adsorption. Adsorption kinetic and thermodynamics of Congo red on PPy-MMT nanocomposites were studied. Results indicated that the primary mechanism for Congo red adsorption on PPY-MMT was chemical monomolecular adsorption.