Chitosan-coated-magnetite with Covalently Grafted Polystyrene Based Carbon Nanocomposites for Hexavalent Chromium Adsorption

Hongbo Gu; Xiaojiang Xu; Hongyuan Zhang; Chaobo Liang; Han Lou; Chao Ma; Yujie Li; Zhanhu Guo; Junwei Gu

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Engineered Science

Chitosan-coated-magnetite with Covalently Grafted Polystyrene Based Carbon Nanocomposites for Hexavalent Chromium Adsorption

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Hongbo Gu, Xiaojiang Xu, Hongyuan Zhang, Chaobo Liang, Han Lou, Chao Ma, Yujie Li, Zhanhu Guo and Junwei Gu

Hongbo Gu ^{1, Email}

Xiaojiang Xu¹

Hongyuan Zhang¹

Chaobo Liang³

Han Lou ¹

Chao Ma¹

Yujie Li¹

Zhanhu Guo ²

Junwei Gu^{3, Email}

¹ Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, China

² Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee, 37966, USA

³MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Shaanxi Key Laboratory of Macromolecular Science and Technology, Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi’ an, Shaanxi, 710072, China

Abstract

A chitosan-coated-magnetite with covalently grafted polystyrene (g-PS) based magnetic carbon nanocomposites composed of carbon coated magnetite nanoparticles with carbonized g-PS microsphere are prepared for effective hexavalent chromium (Cr(VI)) adsorption. The adsorption measurements have indicated that the fabricated magnetic nanocomposites FC515 exhibit an effective Cr(VI) adsorption performance and the optimal pH for Cr(VI) adsorption on FC515 is 3.0 at 298 K. The Cr(VI) adsorption kinetics on FC515 is found to follow the pseudo-second-order behavior with a room temperature initial adsorption rate of 7.106 g mg^-1 min^-1 for the solution with an initial Cr(VI) concentration of 6.5 mg L^-1 and pH value of 3.0. The adsorption isotherm test illustrates that the Langmuir isotherm model with a monolayer adsorption is well fitted for Cr(VI) adsorption on FC515 than the Freundlich isotherm model. The thermodynamic parameters including negative standard Gibb’s free energy change and standard enthalpy change suggest that the Cr(VI) adsorption on FC515 is spontaneous and exothermic. After 5 cycles, FC515 still maintain 86% of Cr(VI) adsorption capacity, exhibiting a good reusability in practice. The zeta-potential and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the Cr(VI) adsorption on FC515 is mainly from the electrostatic interaction between FC515 and Cr(VI). This work provides a new method to design the novel structure of magnetic carbon nanocomposites with natural polymer chitosan and thermoplastic PS for Cr(VI) wastewater treatment.

Chitosan-coated-magnetite with Covalently Grafted Polystyrene Based Carbon Nanocomposites for Hexavalent Chromium Adsorption

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Article type:
Research Paper

Published online:
08 Mar 2018

DOI:
10.30919/espub.es.180308

Volume:
1

Page:
46-54

Citation:
Engineered Science, 2018, 1, 46-54
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Magnetic carbon nanocomposites were synthesized and exhibit an effective Cr(VI) adsorption perf....

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