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Thiol-functionalized magnetite/graphene oxide hybrid as a reusable adsorbent for Hg2+ removal

Jian Bao1*, You Fu2 and Zhihao Bao2*

Author Affiliations

1 Jiangsu Provincial Academy of Environmental Science, 241 Fenghuang West Street, Nanjing, Jiangsu 210036, China

2 Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, 1239 Siping Road, Shanghai 200092, China

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Nanoscale Research Letters 2013, 8:486  doi:10.1186/1556-276X-8-486

Published: 19 November 2013

Abstract

A thiol-functionalized magnetite/graphene oxide (MGO) hybrid as an adsorbent of Hg2+ was successfully synthesized by a two-step reaction. It exhibited a higher adsorption capacity compared to the bare graphene oxide and MGO due to the combined adsorption of thiol groups and magnetite nanocrystals. Its capacity reached 289.9 mg g-1 in a solution with an initial Hg2+ concentration of 100 mg l-1. After being exchanged with H+, the adsorbent could be reused. The adsorption of Hg2+ by the thiol-functionalized MGO fits well with the Freundlich isotherm model and followed pseudo-second-order kinetics.

Keywords:
Mercury ion; Magnetite; Adsorption capacity; Graphene oxide; Hybrid