聚吡咯/凹凸棒石纳米复合材料对阳离子红吸附性能

Adsorption of cationic red dye on polypyrrole/attapulgite nanocomposites

以纳米凹凸棒石为核体,在其表面原位聚合包覆聚吡咯层,制备聚吡咯/凹凸棒石纳米复合材料,并将其用于对阳离子红X-GRL的吸附。结果表明,聚吡咯/凹凸棒石纳米复合材料对X-GRL的吸附动力学符合准二级动力学方程,吸附热力学符合Langmuir等温吸附方程;最大吸附量为113.629mg.g-1,吸附焓变为18.66kJ.mol-1,吸附自由能变在-27.18～-35.14kJ.mol-1之间,吸附熵变约为151J.mol-1.K-1。吸附过程为吸热过程,聚吡咯/凹凸棒石纳米复合材料对X-GRL的吸附是物理和化学吸附并存的过程。

The polypyrrole/attapulgite nanocomposites were prepared via in-situ polymerization of pyrrole monomer on the surface of ATP. The prepared nanocomposites were applied in the adsorption experiments of cationic red dye X- GRL. The results showed that XGRL adsorption on PPy/ATP nanocomposites fired the law of pseudo-second order kinet- ics, and the thermodynamics of X-GRL adsorption on the nanocomposites followed the isothermal adsorption equations of Langmuir. The maximum adsorption capacity could reach 113. 629mg ·g^-1. The Gibbs free energy and adsorption enthalpy were 18. 66kJ· mol ^-1 and -27.18--35.14kJ ·mol^-1 respectively,and the adsorption entropy was 151J ·mol^-1 · K^-1. The adsorption of cationic red dye was the coexistence of physical and chemical adsorption process and it was an endother- real process.