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首页> 外文期刊>RSC Advances >One-step synthesis of magnetic 1,6-hexanediamine-functionalized reduced graphene oxide-zinc ferrite for fast adsorption of Cr(VI)
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One-step synthesis of magnetic 1,6-hexanediamine-functionalized reduced graphene oxide-zinc ferrite for fast adsorption of Cr(VI)

机译：磁性1,6-己二胺官能化的氧化石墨烯 - 氧化锌铁素体的一步合成，用于快速吸附Cr（VI）

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摘要

A one-step solvothermal method was developed to prepare nearly cubic ZnFe2O4 nanoparticles loaded on 1,6-hexanediamine-functionalized reduced graphene oxide (HDA-RGO-ZnFe2O4) for fast removal of Cr(VI). The materials were characterized by transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, Raman, and vibrating sample magnetometry. Experimental results indicated that Cr(VI) adsorption by HDA-RGO-ZnFe2O4 is strongly pH dependent and the adsorption equilibrium could be reached within 12 min. The kinetic adsorption of different initial concentrations can be accurately described by the pseudo-second-order model. The overall rate process was apparently influenced by external mass transfer and intraparticle diffusion. The Langmuir isotherm model is consistent with the experimental data at different temperatures and the maximum adsorption capacity was determined to be 172.4 mg g(-1). Moreover, the thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic. The adsorption mechanism and desorption experiments were also studied. After adsorption, the HDA-RGO-ZnFe2O4 could be quickly separated from the media by an external magnetic field and the adsorption capacity can remain up to 82% after five times of usage. The results implied that HDA-RGO-ZnFe2O4 is a promising adsorbent for the removal of Cr(VI).
机译：的一步溶剂热法的开发是为了制备用于快速吸附去除Cr（VI）装载于1,6-己二胺官能化还原氧化石墨烯（HDA-RGO-铁酸锌）近铁酸锌立方纳米颗粒。这些材料的特点是透射电子显微镜，傅里叶变换红外光谱法，X射线衍射，拉曼光谱，和振动样品磁强计。实验结果表明，由HDA-RGO-铁酸锌的Cr（VI）的吸附强烈依赖于pH和吸附平衡可以12分钟内达到。不同初始浓度的动态吸附可以通过伪二阶模型准确地描述。整个运动过程显然被外界传质和内扩散的影响。 Langmuir等温模型是具有在不同温度下的实验数据和最大吸附量一致的测定为172.4毫克克（-1）。此外，热力学参数表明，吸附过程是自发的吸热。吸附机理和解吸实验进行了研究。吸附后，将HDA-RGO-铁酸锌可以快速地从媒体通过的外部磁场分离，并且之后使用的五倍的吸附能力可保持高达82％。结果暗示，HDA-RGO-铁酸锌是用于去除的Cr（VI）有希望的吸附剂。

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  • 来源
    《RSC Advances》 |2015年第40期|共11页
  • 作者

    Li Haizhen; Zhang Li; Sun Zebin; Liu Yan; Yang Bo; Yan Shiqiang;

  • 作者单位

    Lanzhou Univ Coll Chem &

    Chem Engn Lanzhou 730000 Peoples R China;

    Lanzhou Univ Coll Chem &

    Chem Engn Lanzhou 730000 Peoples R China;

    Lanzhou Univ Coll Chem &

    Chem Engn Lanzhou 730000 Peoples R China;

    Lanzhou Univ Coll Chem &

    Chem Engn Lanzhou 730000 Peoples R China;

    Lanzhou Univ Coll Chem &

    Chem Engn Lanzhou 730000 Peoples R China;

    Lanzhou Univ Coll Chem &

    Chem Engn Lanzhou 730000 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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