MnO2@Fe3O4/石墨烯复合材料对水中Pb(Ⅱ)的吸附

龙昊宇; 黄彬彬; 翁白莎; 王悦

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中国环境科学 ›› 2020, Vol. 40 ›› Issue (7) : 2888-2900.

水污染与控制

MnO₂@Fe₃O₄/石墨烯复合材料对水中Pb(Ⅱ)的吸附

龙昊宇^1,2, 黄彬彬¹, 翁白莎², 王悦¹

作者信息 +

Adsorption properties of MnO₂@Fe₃O₄/reduced graphene oxide composites for Pb(Ⅱ) from water solution

LONG Hao-yu^1,2, HUANG Bin-bin¹, WENG Bai-sha², WANG Yue¹

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文章历史 +

摘要

以氧化石墨烯（GO）为原料制备MnO₂@Fe₃O₄/石墨烯（RGO），考察吸附过程中MnO₂@Fe₃O₄/RGO投加量、溶液pH值、初始浓度和吸附时间等因素对Pb（Ⅱ）的去除率和吸附量的影响，并运用BET比表面积测试法计算MnO₂@Fe₃O₄/RGO的比表面积和平均孔径，采用扫描电子显微镜（SEM），振动样品磁强计（VSM），X射线衍射（XRD）和X射线光电子能谱（XPS）等对样品进行表征.结果表明：MnO₂@Fe₃O₄/RGO的比表面积为89.164m²/g，孔容为0.284cm³/g；随着pH值在2~10范围内增加，复合材料对Pb（Ⅱ）的去除率先增大后减小，pH=6时达到最大值.通过4种等温吸附模型（Langmuir、Freundlich、Temkin、D-R模型）和4种吸附动力学模型（伪一级动力学、伪二级动力学、Elovich、颗粒内扩散模型）拟合发现，MnO₂@Fe₃O₄/RGO对Pb（Ⅱ）吸附符合伪二级动力学模型.吸附等温线更符合Langmiur模型，属于典型的单分子层吸附，以化学吸附为主，最大吸附量为265.3mg/g.

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.

导出引用

龙昊宇, 黄彬彬, 翁白莎, 王悦. MnO₂@Fe₃O₄/石墨烯复合材料对水中Pb(Ⅱ)的吸附[J]. 中国环境科学. 2020, 40(7): 2888-2900

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

中图分类号： X703

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