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首页> 外文期刊>New Journal of Chemistry >Insight into the adsorption mechanisms of aqueous hexavalent chromium by EDTA intercalated layered double hydroxides: XRD, FTIR, XPS, and zeta potential studies
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Insight into the adsorption mechanisms of aqueous hexavalent chromium by EDTA intercalated layered double hydroxides: XRD, FTIR, XPS, and zeta potential studies

机译：EDTA插层双氢氧化物欣赏六价铬水溶液的吸附机制：XRD，FTIR，XPS和Zeta潜在研究

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摘要

To understand the possible mechanisms of hexavalent chromium (Cr(VI)) adsorption on the surface of modified layered double hydroxides (LDHs), we synthesized ethylenediaminetetraacetic acid intercalated MgAl-LDH (LDH-EDTA) and its magnetic product (Mag-LDH-EDTA), and evaluated their adsorption performance for Cr(VI) by batch equilibrium experiments. The characterization analysis proved that the EDTA was intercalated into MgAl-LDH and the adsorbents had an ordered structure and abundant functional groups. The adsorption mechanisms of Cr(VI) by LDH-EDTA and Mag-LDH-EDTA could be attributed as electrostatic attraction, surface complexation, anion exchange, and reduction reaction speculating from the detailed X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and zeta potential analysis. The removal ratio remained above 96% and 79% for 50 mg L-1 Cr(VI) using 0.03 g LDH-EDTA and Mag-LDH-EDTA, respectively. The adsorption process was less influenced by the pH value of the aqueous solution. The pseudo-second-order model and the Langmuir equation well fitted to the adsorption kinetic and isotherm data. Thus, the EDTA intercalated LDH materials had potential applications for Cr(VI) removal in real wastewater treatment.
机译：要了解在改性层状双氢氧化物（LDHs）表面上吸附的六价铬（Cr（vi））吸附的可能机制，我们合成乙二胺四乙酸层插入MgAl-LDH（LDH-EDTA）及其磁性产品（Mag-Ldh-EDTA ），并通过批量平衡实验评估Cr（VI）的吸附性能。表征分析证明，EDTA嵌入到MGAL-LDH中，吸附剂具有有序结构和丰富的官能团。通过LDH-EDTA和MAG-LDH-EDTA的Cr（VI）的吸附机制可归因于静电吸引，表面络合，阴离子交换和从详细的X射线衍射图案（XRD），傅里叶变换红外线的还原反应。光谱学（FTIR），X射线光电子能谱（XPS）和Zeta电位分析。使用0.03g LDH-EDTA和MAG-LDH-EDTA，除去比率分别仍高于96％和79％，50mg L-1 Cr（VI）。吸附过程较小受水溶液的pH值的影响。伪二阶模型和廊口方程适合于吸附动力学和等温数据。因此，EDTA插层的LDH材料具有在实际废水处理中的Cr（VI）去除的潜在应用。

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  • 来源
    《New Journal of Chemistry》 |2019年第40期|共9页
  • 作者

    Li Jing; Yan Liangguo; Yang Yanting; Zhang Xue; Zhu Rixin; Yu Haiqin;

  • 作者单位

    Univ Jinan Sch Water Conservancy &

    Environm Key Lab Water Resources &

    Environm Engn Univ Shan Jinan 250022 Peoples R China;

    Univ Jinan Sch Water Conservancy &

    Environm Key Lab Water Resources &

    Environm Engn Univ Shan Jinan 250022 Peoples R China;

    Univ Jinan Sch Water Conservancy &

    Environm Key Lab Water Resources &

    Environm Engn Univ Shan Jinan 250022 Peoples R China;

    Univ Jinan Sch Water Conservancy &

    Environm Key Lab Water Resources &

    Environm Engn Univ Shan Jinan 250022 Peoples R China;

    Univ Jinan Sch Water Conservancy &

    Environm Key Lab Water Resources &

    Environm Engn Univ Shan Jinan 250022 Peoples R China;

    Univ Jinan Sch Water Conservancy &

    Environm Key Lab Water Resources &

    Environm Engn Univ Shan Jinan 250022 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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