Adsorption of Pb(II) and Hg(II) from aqueous solution using magnetic CoFe₂O₄-reduced graphene oxide

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• 作者：Yakun Zhang ; Liangguo Yan ; Weiying Xu ; Xiaoyao Guo ; Limei Cui ; Liang Gao ; Qin Wei ; Bin Du
• 关键词：Adsorption ; Magnetic CoFe2O4-reduced graphene oxide ; Pb(II) ; Hg(II)
• 刊名：Journal of Molecular Liquids
• 出版年：March, 2014
• 年：2014
• 卷：191
• 期：Complete
• 页码：177-182
• 全文大小：771 K

文摘

Magnetic cobalt ferrite (CoFe₂O₄)-reduced graphene oxide (rGO) nanocomposites (CoFe₂O₄-rGO) were developed as an adsorbent to remove Pb(II) and Hg(II) from aqueous solution. The CoFe₂O₄-rGO was prepared by a facile approach and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area and Zeta potential measurement. In this work, contact time, adsorbent dose, and solution pH temperature were optimized. The sorption kinetics and isotherm model fitting studies, demonstrated that data fit well to pseudo-second order kinetics and Langmuir isotherm models. The highest adsorption equilibrium for Pb(II) were 299.4 mg/g at pH of 5.3 and 25 掳C; while for Hg(II) were 157.9 mg/g at pH of 4.6 and 25 掳C. Due to magnetic property, CoFe₂O₄-rGO could be simply recovered from water by magnetic separations at low magnetic field within 2 min.