Preparation of core-shell magnetic Fe_3O_4@SiO_2-dithiocarbamate nanoparticle and its application for the Ni~(2+), Cu~(2+) removal

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英文篇名：Preparation of core-shell magnetic Fe_3O_4@SiO_2-dithiocarbamate nanoparticle and its application for the Ni~(2+), Cu~(2+) removal 作者：Yimin ; Dai ; Lanli ; Niu ; Jiaqi ; Zou ; Tianxiao ; Chen ; Hui ; Liu ; Yi ; Zhou 英文作者：Yimin Dai;Lanli Niu;Jiaqi Zou;Tianxiao Chen;Hui Liu;Yi Zhou;School of Chemistry and Biological Engineering, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science and Technology; 英文关键词：Core-shell;;Magnetic nanoparticle;;Dithiocarbamate;;Adsorption;;Heavy metals removal 中文刊名：FXKB 英文刊名：中国化学快报(英文版) 机构：School of Chemistry and Biological Engineering, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science and Technology; 出版日期：2018-06-15 出版单位：Chinese Chemical Letters 年：2018 期：v.29 基金：the financial support provided by the National Natural Science Foundation of China (No. 21671026);; the Science and Technology Key Project of Hunan Province (No. 2015SK20823);; Scientific Research Key Fund of Hunan Provincial Education Department (No. 15A001);; the Foundation of Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation (No. 2017CL06) 语种：英文; 页：FXKB201806036 页数：5 CN：06 ISSN：11-2710/O6 分类号：183-187

摘要

A novel magnetic nanoparticles-based dithiocarbamate absorbent(Fe_3O_4@SiO_2-DTC) with core-shell structure was synthesized under mild conditions and used in aqueous solution Ni~(2+) and Cu~(2+) ions treatment. The structure, morphology and magnetic properties of the adsorbent were characterized by Xray diffraction(XRD), fourier transformed infrared spectroscopy(FTIR), scanning electron microscopy(SEM), transmission electron microscopy(TEM), and vibrating sample magnetometer(VSM).Fe_3O_4@SiO_2-DTC exhibited a typical superparamagnetic with a saturation magnetization value of52.7 emu/g, which could be rapidly separated from aqueous solution under external magnetic field. We investigated the effects of solution p H, adsorption time, and the initial concentration of heavy metal ions on the adsorption of Ni~(2+) and Cu~(2+). The adsorption equilibrium times of Ni~(2+)and Cu~(2+) on Fe3 O_4@SiO_2-DTC were reached at 15 min and 90 min, respectively. The adsorption kinetic data were fitted to the pseudosecond-order model, and the adsorption data were consistent with the Frenudlich isotherm model. When the initial concentration of heavy metal ions was 250 mg/L, the maximum adsorption capacity of Ni~(2+) and Cu~(2+) at room temperature was 235.23 mg/g and 230.49 mg/g, respectively. In addition, we discussed the plausible adsorption mechanism. The results indicated that the adsorption was mainly dominated by chelation.
        A novel magnetic nanoparticles-based dithiocarbamate absorbent(Fe_3O_4@SiO_2-DTC) with core-shell structure was synthesized under mild conditions and used in aqueous solution Ni~(2+) and Cu~(2+) ions treatment. The structure, morphology and magnetic properties of the adsorbent were characterized by Xray diffraction(XRD), fourier transformed infrared spectroscopy(FTIR), scanning electron microscopy(SEM), transmission electron microscopy(TEM), and vibrating sample magnetometer(VSM).Fe_3O_4@SiO_2-DTC exhibited a typical superparamagnetic with a saturation magnetization value of52.7 emu/g, which could be rapidly separated from aqueous solution under external magnetic field. We investigated the effects of solution p H, adsorption time, and the initial concentration of heavy metal ions on the adsorption of Ni~(2+) and Cu~(2+). The adsorption equilibrium times of Ni~(2+)and Cu~(2+) on Fe3 O_4@SiO_2-DTC were reached at 15 min and 90 min, respectively. The adsorption kinetic data were fitted to the pseudosecond-order model, and the adsorption data were consistent with the Frenudlich isotherm model. When the initial concentration of heavy metal ions was 250 mg/L, the maximum adsorption capacity of Ni~(2+) and Cu~(2+) at room temperature was 235.23 mg/g and 230.49 mg/g, respectively. In addition, we discussed the plausible adsorption mechanism. The results indicated that the adsorption was mainly dominated by chelation.

引文

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