MnO2@Fe3O4/石墨烯复合材料对水中Pb(Ⅱ)的吸附

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Abstract In this study, MnO₂@Fe₃O₄/reduced graphene oxide (RGO) was produced by graphene oxide (GO). The adsorption quantity and removal rate of Pb(Ⅱ) onto MnO₂@Fe₃O₄/RGO were examined by several variables like the dosage of MnO₂@Fe₃O₄/RGO, pH of the solution, adsorption time and the initial concentration of Pb(Ⅱ). The specific surface area of the MnO₂@Fe₃O₄/RGO was determined via the Brunauer-Emmett-Teller(BET) specific surface area measurement. The characteristics of modified samples were evaluated by scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that the specific surface area and average pore volume of MnO₂@Fe₃O₄/RGO were 89.164m²/g and 0.284cm³/g, respectively. With the pH increased in the range of 2 to 10, the removal rate of Pb(Ⅱ) by the composite increased first and then decreased, reaching a maximum at pH of 6. In addition, the experimental data were fitted by the four kinds of isothermal adsorption models (Langmuir, Freundlich, Temkin and D-R models) and the four kinds of adsorption kinetics models (Pseudo first-order, Pseudo second-order, Elovich and Intra-particle diffusion models). The adsorption of MnO₂@Fe₃O₄/RGO on Pb (Ⅱ) conformed to the pseudo-second-order kinetic model. The adsorption isotherm was more consistent with the Langmiur model, which was a typical monomolecular adsorption, mainly chemical adsorption, and the maximum adsorption capacity was 265.3mg/g.

Key words： reduced graphene oxide Fe₃O₄ MnO₂ Pb(II) adsorption

Received: 24 December 2019

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X703

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	LONG Hao-yu
	HUANG Bin-bin
	WENG Bai-sha
	WANG Yue

Cite this article:

LONG Hao-yu,HUANG Bin-bin,WENG Bai-sha等. Adsorption properties of MnO₂@Fe₃O₄/reduced graphene oxide composites for Pb(Ⅱ) from water solution[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2888-2900.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/2888

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