Title: Removal of Hg(II) and methylene blue from single aqueous solution by ethylenediamine modified magnetic graphene oxide nanocomposites

Authors: Wenjie Shao; Yingxia Ma; Pengsheng Jin; Haipeng Yang

Addresses: State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China ' State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China ' State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China ' Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China

Abstract: Herein, the ethylenediamine modified magnetic graphene oxide (Fe₃O₄/GO-NH₂) materials were used to eliminate Hg(II) and methylene blue (MB) dye from single aqueous solutions. The various adsorption conditions of Fe₃O₄/GO-NH₂ materials were explored and the experimental process highly depended on the initial pH, contact times and initial concentrations of Hg(II) and MB. The Langmuir and Freundlich isotherm models were employed to explore the adsorption behaviours and the kinetics experimental process were described by the pseudo-first-order and pseudo-second-order model. The experiments show that adsorption amounts of Fe₃O₄/GO-NH₂ materials for Hg(II) and MB reached 147.68 mg·g⁻¹ and 236.97 mg·g⁻¹, respectively. The adsorption process was well correlated with pseudo-second-order kinetic model and the Langmuir isotherm model, which indicates the removal processes of Fe₃O₄/GO-NH₂ nanocomposites for Hg(II) and MB were monolayer chemisorption.

Keywords: ethylenediamine; magnetic graphene oxide; adsorption; Hg(II); methylene blue.

DOI: 10.1504/IJETM.2020.114126

International Journal of Environmental Technology and Management, 2020 Vol.23 No.5/6, pp.386 - 396

Accepted: 29 Aug 2020
Published online: 09 Apr 2021 *

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