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凹凸棒石/CoFe2O4磁性复合材料对Cr(Ⅵ)的吸附性能

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梁丽珠, 王诗生, 盛广宏. 凹凸棒石/CoFe2O4磁性复合材料对Cr(Ⅵ)的吸附性能[J]. 环境工程学报, 2016, 10(10): 5586-5592. doi: 10.12030/j.cjee.201505200
引用本文: 梁丽珠, 王诗生, 盛广宏. 凹凸棒石/CoFe2O4磁性复合材料对Cr(Ⅵ)的吸附性能[J]. 环境工程学报, 2016, 10(10): 5586-5592. doi: 10.12030/j.cjee.201505200
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LIANG Lizhu, WANG Shisheng, SHENG Guanghong. Adsorption capability of Cr(Ⅵ) on attapulgite/CoFe2O4 composite materials[J]. Chinese Journal of Environmental Engineering, 2016, 10(10): 5586-5592. doi: 10.12030/j.cjee.201505200
Citation: LIANG Lizhu, WANG Shisheng, SHENG Guanghong. Adsorption capability of Cr(Ⅵ) on attapulgite/CoFe2O4 composite materials[J]. Chinese Journal of Environmental Engineering, 2016, 10(10): 5586-5592. doi: 10.12030/j.cjee.201505200
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凹凸棒石/CoFe2O4磁性复合材料对Cr(Ⅵ)的吸附性能

  • 1.

    安徽工业大学能源与环境学院, 马鞍山 243032

  • 2.

    安徽工业大学生物膜法水质净化及利用技术教育部工程研究中心, 马鞍山 243032

  • 基金项目:

    安徽省高校自然科学研究重点项目（KJ2010A049，KJ2011A047）

  • 中图分类号: X703

Adsorption capability of Cr(Ⅵ) on attapulgite/CoFe2O4 composite materials

  • 1.

    School of Energy and Environment, Anhui University of Technology, Ma'anshan 243032, China

  • 2.

    Water Purification by Biofilm Method and Utilization, Engineering Research Center of Ministry of Education, Anhui University of Technology, Ma'anshan 243032, China

  • Fund Project:

  • 摘要: 采用低温回流法制备凹凸棒石/CoFe2O4磁性复合材料，利用比表面积（BET）、磁滞回线、红外光谱（FTIR）等手段对磁性复合材料进行表征，并研究磁性复合材料对Cr（Ⅵ）的吸附性能，利用吸附前后FTIR和光电子能谱（XPS）对其吸附机理进行初步探讨。结果表明，磁性复合材料的比表面积为175.85 m2·g-1，略大于凹凸棒石；饱和磁化强度为14 emu·g-1，易于磁分离。pH在2~12范围内，吸附量随pH值的增大而减小。Freundlich等温吸附模型能较好描述吸附实验结果。ΔG为-15.19~-14.28 kJ·mol-1，ΔH为-19.15 kJ·mol-1，ΔS为-13.96~-14.20 J·（mol·K）-1，说明该吸附是自发、放热的，低温有利于吸附；动力学实验表明吸附行为符合准二级动力学。由吸附前后的FTIR可知凹凸棒石/CoFe2O4中羟基参与Cr（Ⅵ）吸附过程；XPS分析可知吸附过程包含Cl-与铬酸根的离子交换和Cr（Ⅵ）还原为Cr（Ⅲ）的反应。
    Abstract: A low-temperature reflow method was adopted to prepare an attapulgite/CoFe2O4 magnetic composite material.The specific surface area (BET),the magnetic hysteresis loop,and Fourier transform infrared spectroscopy (FTIR) were used to characterize the composite materials,and the adsorption properties of Cr(Ⅵ) were studied.The adsorption mechanisms were investigated using FTIR and X-ray photoelectron spectroscopy (XPS) before and after adsorption.The results showed that the specific surface area of the composite material was 175.85 m2·g-1,which is slightly larger than that of attapulgite.The saturation magnetization ratio was 14 emu·g-1,indicating strong magnetic and easier magnetic separation properties.When the pH was in the range of 2 to 12,the adsorption capacity of Cr(Ⅵ) decreased as the pH values increased.The Freundlich adsorption model can fit the experimental results better than the Langmuir model can.The Gibbs free energy was -15.19 to -14.28 kJ·mol-1,the enthalpy was -19.15 kJ·mol-1,and the entropy was -13.96 to -14.20 J·(mol·K)-1,which indicated that the adsorption was spontaneous and exothermic.Thus,a low temperature favors Cr(Ⅵ) adsorption.The kinetic results showed that the adsorption behavior followed the pseudo-second-order model.FTIR showed that the hydroxyl of attapulgite/CoFe2O4 participated in the adsorption.XPS analysis showed that the adsorption process involved the exchange of chloride for chromate and reduction to Cr(Ⅲ).
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出版历程
  • 收稿日期:  2015-07-05
  • 刊出日期:  2016-10-20

凹凸棒石/CoFe2O4磁性复合材料对Cr(Ⅵ)的吸附性能

  • 1.  安徽工业大学能源与环境学院, 马鞍山 243032
  • 2.  安徽工业大学生物膜法水质净化及利用技术教育部工程研究中心, 马鞍山 243032
  • 收稿日期:  2015-07-05
基金项目:

安徽省高校自然科学研究重点项目（KJ2010A049，KJ2011A047）

摘要: 采用低温回流法制备凹凸棒石/CoFe2O4磁性复合材料，利用比表面积（BET）、磁滞回线、红外光谱（FTIR）等手段对磁性复合材料进行表征，并研究磁性复合材料对Cr（Ⅵ）的吸附性能，利用吸附前后FTIR和光电子能谱（XPS）对其吸附机理进行初步探讨。结果表明，磁性复合材料的比表面积为175.85 m2·g-1，略大于凹凸棒石；饱和磁化强度为14 emu·g-1，易于磁分离。pH在2~12范围内，吸附量随pH值的增大而减小。Freundlich等温吸附模型能较好描述吸附实验结果。ΔG为-15.19~-14.28 kJ·mol-1，ΔH为-19.15 kJ·mol-1，ΔS为-13.96~-14.20 J·（mol·K）-1，说明该吸附是自发、放热的，低温有利于吸附；动力学实验表明吸附行为符合准二级动力学。由吸附前后的FTIR可知凹凸棒石/CoFe2O4中羟基参与Cr（Ⅵ）吸附过程；XPS分析可知吸附过程包含Cl-与铬酸根的离子交换和Cr（Ⅵ）还原为Cr（Ⅲ）的反应。

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