Abstract

以天然石墨粉、正硅酸乙酯、吡咯单体为原料，通过溶胶-凝胶法和原位沉淀法合成高比表面积石墨烯/SiO2-聚吡咯复合材料（GS-PPy），并对其去除水中Cr（Ⅵ）的效果进行研究，探讨溶液pH、反应时间、反应温度等因素对吸附过程的影响，同时结合TEM、XPS、FTIR等多种表征手段，探讨GS-PPy去除Cr（Ⅵ）的反应机理。研究结果表明：在pH=2.0时，GS-PPy对Cr（Ⅵ）吸附效果最好；吸附过程符合伪二级动力学和Freundlich等温线模型，为多分子层化学吸附，反应过程为吸热反应。GS-PPy去除Cr（Ⅵ）的机理主要包括静电吸引、离子交换以及氧化还原作用。

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