石墨烯/SiO<sub>2</sub>-聚吡咯复合材料对水中Cr(Ⅵ)的吸附

方伟; 江鲜英; 黎京士; 骆其金

doi:10.13205/j.hjgc.202011009

石墨烯/SiO₂-聚吡咯复合材料对水中Cr(Ⅵ)的吸附

doi: 10.13205/j.hjgc.202011009

生态环境部华南环境科学研究所, 广州 510655

基金项目:

公益性科研院所基本科研业务费专项（PM-zx703-201701-048）；广东省重点自然科学基金（2015A030311002，2017A020216018）。

详细信息

作者简介:
方伟(1993-),男,硕士研究生,主要研究方向为新型材料的制备与污水处理。fang_w@foxmail.com

通讯作者:
骆其金(1983-),男,硕士,高级工程师,主要研究方向为水污染治理与控制。luoqijin@scies.org

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- 文章访问数: 91
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- 被引次数: 0
出版历程
- 收稿日期: 2019-10-13
- 网络出版日期: 2021-04-23
- 刊出日期: 2021-04-23

ADSORPTION CAPABILITY OF GRAPHENE/SiO₂-POLYPYRROLE COMPOSITES FOR Cr(Ⅵ) IN WATER

South China Institute of Environmental Sciences, MEE, Guangzhou 510655, China

摘要

摘要: 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。
- 石墨烯 /
- 聚吡咯 /
- 吸附 /
- Cr(Ⅵ)
Abstract: Natural graphite powder, tetraethylorthosilicate and pyrrole monomer were used as the raw materials to synthesize graphene/SiO₂-polypyrrole nanocomposite (GS-PPy) through the sol-gel method and in situ precipitation method. And GS-PPy was used to remove Cr(Ⅵ) in the solution. The effects of solution pH, reaction time, solution concentration, and temperature on adsorption effect were investigated. Meanwhile, methods the removal mechanisms of Cr(Ⅵ) removal by GS-PPy were investigated by TEM, XPS, FTIR and other characterization. The results showed that the adsorption effect was the best at pH=2.0. The adsorption process conformed to the pseudo-second-order kinetic model and the Freundlich isotherm model, which was defined as multi-molecular layer chemical adsorption and endothermic reaction. The mechanisms of Cr(Ⅵ) removal by GS-PPy mainly includes electrostatic attraction, ion exchange and redox.
- graphene /
- polypyrrole /
- adsorption /
- Cr(Ⅵ)

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