ADSORPTION CAPABILITY OF GRAPHENE/SiO<sub>2</sub>-POLYPYRROLE COMPOSITES FOR Cr(Ⅵ) IN WATER

FANG Wei; JIANG Xian-ying; LI Jing-shi; LUO Qi-jin

doi:10.13205/j.hjgc.202011009

Volume 38 Issue 11

Apr. 2021

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FANG Wei, JIANG Xian-ying, LI Jing-shi, LUO Qi-jin. ADSORPTION CAPABILITY OF GRAPHENE/SiO2-POLYPYRROLE COMPOSITES FOR Cr(Ⅵ) IN WATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(11): 53-59. doi: 10.13205/j.hjgc.202011009

Citation:

FANG Wei, JIANG Xian-ying, LI Jing-shi, LUO Qi-jin. ADSORPTION CAPABILITY OF GRAPHENE/SiO₂-POLYPYRROLE COMPOSITES FOR Cr(Ⅵ) IN WATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(11): 53-59. doi: 10.13205/j.hjgc.202011009

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

doi: 10.13205/j.hjgc.202011009

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

Received Date: 2019-10-13
Available Online: 2021-04-23
Publish Date: 2021-04-23

Abstract

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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References(30)

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