MnO2@Fe3O4/石墨烯复合材料对水中Pb(Ⅱ)的吸附

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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.

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	龙昊宇
	黄彬彬
	翁白莎
	王悦

关键词 ：石墨烯, Fe₃O₄, MnO₂, Pb(II), 吸附

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

收稿日期: 2019-12-24

PACS:

X703

基金资助:国家自然科学基金资助项目（51569015，41761058，51969016）；江西省水安全与可持续发展软科学研究基地开放基金资助项目（19JDZD01）；江西省科技厅自然科学基金资助项目（20192ACBL21044）

通讯作者: 黄彬彬,教授,wanilyzxh@163.com E-mail: wanilyzxh@163.com

作者简介: 龙昊宇(1996-),女,江西吉安人,南昌工程学院硕士研究生,主要从事水污染、水文与水资源方面的研究.

引用本文:

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. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2888-2900.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2020/V40/I7/2888

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