Functional group-rich hyperbranched magnetic material for simultaneous efficient removal of heavy metal ions from aqueous solution.
Functional group-rich hyperbranched magnetic material for simultaneous efficient removal of heavy metal ions from aqueous solution.
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DOI：
10.1016/j.jhazmat.2019.121288
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发表时间：
2020-02
影响因子：
13.6
通讯作者：
Huicai Wang;Zhenwen Wang;Ruirui Yue;Feng Gao;R. Ren;Junfu Wei;Xiao-lei Wang;Zhiyun Kong
中科院分区：
文献类型：
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作者：
Huicai Wang;Zhenwen Wang;Ruirui Yue;Feng Gao;R. Ren;Junfu Wei;Xiao-lei Wang;Zhiyun Kong
为了达到同时去除共存重金属离子的目的，本工作设计并制备了高密度、多吸附位点的功能化磁性介孔纳米材料（Fe3O4-HBPA-ASA）。通过SEM、FTIR、VSM、TGA和zeta电位对所得Fe3O4-HBPA-ASA进行了表征。选择Cu(II)、Pb(II)和Cd(II)作为模型重金属离子，吸附实验表明Fe3O4-HBPA-ASA在单个体系中表现出较高的理论吸附量，最大吸附量分别为136.66mg/g、88.36mg/g和165.46mg/g。在二元和三元体系中，竞争吸附导致Cu(II)、Pb(II)和Cd(II)的吸附能力下降。但在浓度低于15mg/L的三元体系中，同时去除率仍高于90%。吸附等温线和动力学分别通过 Langmuir 和伪二阶模型很好地拟合。 XPS和密度泛函理论（DFT）分析证实，金属离子的吸附与Fe3O4-HBPA-ASA表面的各类官能团有关，而对Cu(II)、Cd(II)和Pb(II)的吸附机制不同。
In order to achieve the purpose of simultaneous removal of coexisting heavy metal ions, in this work, functionalized magnetic mesoprous nanomaterials (Fe3O4-HBPA-ASA) with high density and multiple adsorption sites were designed and prepared. The obtained Fe3O4-HBPA-ASA was characterized by SEM, FTIR, VSM, TGA and zeta potential. Cu(II), Pb(II) and Cd(II) were chosen as the model heavy metal ions, the adsorption experiments showed that Fe3O4-HBPA-ASA showed hightheoretical adsorption capacitiesin individual system, and the maximum adsorption capacity was 136.66 mg/g, 88.36 mg/g and 165.46 mg/g, respectively. In the binary and ternary systems, the competitive adsorption leads to a decrease in the adsorption capacity of Cu(II), Pb(II) and Cd(II). However, in the ternary system with a concentration lower than 15 mg/L, the simultaneous removal rate was still higher than 90%. The adsorption isotherms and kineticswere well fitted by Langmuir and pseudo-second-order models, respectively. The XPS and density functional theory (DFT) analysis have confirmed that the adsorption of metal ions was related to various types of functional groups on the surface of Fe3O4-HBPA-ASA, while the adsorption mechanisms of Cu(II), Cd(II) and Pb(II) were different.