Abstract: The conductivity of polypyrrole（PPy）will be greatly improved by doping. In addition，doping with various protonic acids may have a positive impact on the adsorption of PPy with the protonic acid doping mechanism. PPy doped with various acids（HCl，HNO3，H2SO4） and undoped PPy were synthesized by chemical polymerization. The structure and characteristics of the prepared samples were tested by scanning electron microscopy （SEM），Fourier transform infrared spectrum （FT-IR），specific surface area analysis （BET） and Zeta potential analysis. Then，the effects on the adsorption of Acid Red G onto the samples were studied. Kinetic experiments were conducted at suitable pH. The adsorption process followed the pseudo second-order kinetic equation. Also at this pH，thermodynamic experiments were conducted and data fitting indicated that the adsorption process tended to obey the Langmuir isotherm，with linear correlation coefficients more than 0.99. Thermodynamic parameters indicated that Acid Red G adsorption onto the samples was an endothermic entropy-driven spontaneous process.

Key words: polypyrrole, adsorption, doping, Acid Red G

摘要： 由于掺杂态的聚吡咯导电性能有大幅度的提高，通过质子酸掺杂机制，不同酸掺杂的聚吡咯吸附性可能会有所改善。本文首先用化学氧化法合成了不同酸（盐酸、硝酸、硫酸）掺杂的聚吡咯和未掺杂的聚吡咯，并对制得样品特性进行了扫描电子显微镜（SEM）、傅里叶转换红外光谱（FT-IR）、比表面积分析（BET）、Zeta电位测试，对测定结果进行比较分析；同时考察不同酸掺杂对聚吡咯吸附酸性红G的影响，在最适宜的pH值条件下进行了吸附动力学研究，结果表明吸附过程符合准二级动力学方程；并在同样pH值条件下进行了热力学实验，结果表明吸附过程更倾向于Langmuir吸附等温式，且线性相关系数均在0.99以上，热力学实验参数计算表明样品对酸性红G的吸附是一个自发过程。

关键词: 聚吡咯, 吸附, 掺杂, 酸性红G