化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (2) : 195-199. DOI: 10.19817/j.cnki.issn 1006-3536.2021.02.045

科学研究

纳米二氧化锰@还原氧化石墨烯对水中Pb(Ⅱ)的吸附性能与吸附机制研究

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Adsorption performance and mechanism of Pb(Ⅱ) on nano-MnO₂@RGO

Li Jing^1,2, Bao Dongjie¹, Tian Yunge¹, Lu Xiuguo², Liu Zhangmeng²

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文章历史 +

Received		Published
2019-10-28		2021-02-20
Issue Date	Revised Date
2021-03-03	2019-10-28

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摘要

以重金属Pb(Ⅱ)为目标污染物,制备了MnO₂@还原氧化石墨烯(MnO₂@RGO)复合吸附剂。考察了吸附剂投加量、溶液pH、初始浓度和反应温度等因素对Pb(Ⅱ)去除效果的影响。结果表明:MnO₂@RGO对废水中的Pb(Ⅱ)吸附效果显著,在Pb(Ⅱ)浓度50mg/L,MnO₂@RGO投加量0.15g/L,pH为6.0,吸附时间3h的条件下,吸附量可达到124.3mg/g,Pb(Ⅱ)去除率可达到75%。纳米MnO₂@RGO可用Langmiur等温模型和伪二级动力学方程来描述,为单分子层吸附,以化学吸附为主。在MnO₂@RGO吸附剂的X射线衍射图谱中出现了MnO₂的特征吸收峰,其附着于RGO表面,印证了MnO₂@RGO吸附剂的成功制备。

Abstract

The composite adsorbent of nano-MnO₂@graphene(RGO) was prepared,and introduced to remove Pb(Ⅱ) in water.The effects of various factors,including adsorbent dosage,initial ion concentration,pH,and temperature were evaluated.Under the condition of 50mg/L Pb(Ⅱ) ion concentration,0.15g/L nano-MnO₂@RGO,pH 6.0,and 3h adsorption time,the removal efficiency of Pb(Ⅱ) ion reached 75% and the adsorption capacity of them reached 124.3mg/g.The adsorption data from our experiments fitted the Langmuir isotherm,and the adsorption kinetics data for nano-MnO₂@RGO were better fitted to a pseudo-second-order model,indicating the dominant role of chemisorption.There appeared the characteristic absorption peak of MnO₂ in the X-ray diffraction spectrum (XRD) of MnO₂@RGO,which adhered to the surface of RGO.It can be concluded that the MnO₂@RGO was successfully prepared.

关键词

二氧化锰@还原氧化石墨烯 / 重金属 / 吸附 / 动力学

Key words

MnO₂@RGO / heavy metal / adsorption / kinetics

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纳米二氧化锰@还原氧化石墨烯对水中Pb(Ⅱ)的吸附性能与吸附机制研究[J]. 化工新型材料, 2021, 49(2): 195-199 DOI:10.19817/j.cnki.issn 1006-3536.2021.02.045

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