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氨基改性MCM-48对水溶液中Pd2+的吸附

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陈提先, 李耀威, 刘健, 邵华森. 氨基改性MCM-48对水溶液中Pd2+的吸附[J]. 环境工程学报, 2017, 11(3): 1450-1458. doi: 10.12030/j.cjee.201511062
引用本文: 陈提先, 李耀威, 刘健, 邵华森. 氨基改性MCM-48对水溶液中Pd2+的吸附[J]. 环境工程学报, 2017, 11(3): 1450-1458. doi: 10.12030/j.cjee.201511062
shu
CHEN Tixian, LI Yaowei, LIU Jian, SHAO Huasen. Adsorption of palladium(Ⅱ)from aqueous solution by amino-functionalized MCM-48[J]. Chinese Journal of Environmental Engineering, 2017, 11(3): 1450-1458. doi: 10.12030/j.cjee.201511062
Citation: CHEN Tixian, LI Yaowei, LIU Jian, SHAO Huasen. Adsorption of palladium(Ⅱ)from aqueous solution by amino-functionalized MCM-48[J]. Chinese Journal of Environmental Engineering, 2017, 11(3): 1450-1458. doi: 10.12030/j.cjee.201511062
shu

氨基改性MCM-48对水溶液中Pd2+的吸附

  • 1.

    华南师范大学化学与环境学院, 广东省水环境生态治理与修复工程技术研究中心, 广州 510006

  • 基金项目:

    国家自然科学基金资助项目（21006037）

    广东省自然科学基金资助项目（06300845）

  • 中图分类号: X703

Adsorption of palladium(Ⅱ)from aqueous solution by amino-functionalized MCM-48

  • 1.

    Guangdong Technology Research Center for Ecological Management and Remediation of Water System, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China

  • Fund Project:

  • 摘要: 采用3-氨丙基三乙氧基硅烷对MCM-48进行改性，制备出氨基改性介孔硅材料NH2-MCM-48，通过X射线衍射（XRD）、透射电镜（TEM）、红外光谱（FT-IR）和N2吸附脱附（BET）对NH2-MCM-48进行表征，并探讨了NH2-MCM-48对水溶液中Pd2+的吸附性能。实验考察了初始pH、吸附时间、初始浓度、温度等因素对Pd2+吸附的影响，并讨论了吸附动力学和热力学特征。结果表明：在pH为4~5范围内，吸附效果最好，在150 min内达到吸附平衡。吸附动力学符合拟二级动力学方程，Langmuir等温吸附方程能较好地描述NH2-MCM-48对Pd2+的吸附特性，30℃静态吸附容量为59.67 mg·g-1；热力学分析结果表明，NH2-MCM-48对Pd2+的吸附是自发、吸热反应。吸附-脱附实验表明，0.1 mol·L-1 HCl+5%硫脲对Pd2+的洗脱效果好。
    Abstract: MCM-48 functionalized with 3-aminopropyltriethoxysilane (NH2-MCM-48)was synthesized and characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),nitrogen adsorption-desorption,and Fourier Transform infrared spectrometry (FT-IR). Its application for Pd2+ adsorption from aqueous solution was investigated. The effect of such parameters as solution pH,contact time and temperature,and initial concentration were studied. The results revealed that the optimum adsorption pH of NH2-MCM-48 for Pd2+ was from 4 to 5,and the adsorption equilibrium was reached within 150 min. The adsorption kinetics indicated that the adsorption process followed a pseudo-second-order model. The adsorption isotherm of Pd2+ onto NH2-MCM-48 was well described by the Langmuir equation,and the highest loading capacity was 59.67 mg·g-1 at 30℃. The thermodynamic parameters indicated that Pd2+ adsorption onto NH2-MCM-48 was spontaneous and endothermic. Moreover,NH2-MCM-48 was successfully regenerated using 0.1 mol·L-1 HCl with 5% thiourea.
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  • 收稿日期:  2016-01-26
  • 刊出日期:  2017-03-10

氨基改性MCM-48对水溶液中Pd2+的吸附

  • 1. 华南师范大学化学与环境学院, 广东省水环境生态治理与修复工程技术研究中心, 广州 510006
  • 收稿日期:  2016-01-26
基金项目:

国家自然科学基金资助项目（21006037）

广东省自然科学基金资助项目（06300845）

摘要: 采用3-氨丙基三乙氧基硅烷对MCM-48进行改性，制备出氨基改性介孔硅材料NH2-MCM-48，通过X射线衍射（XRD）、透射电镜（TEM）、红外光谱（FT-IR）和N2吸附脱附（BET）对NH2-MCM-48进行表征，并探讨了NH2-MCM-48对水溶液中Pd2+的吸附性能。实验考察了初始pH、吸附时间、初始浓度、温度等因素对Pd2+吸附的影响，并讨论了吸附动力学和热力学特征。结果表明：在pH为4~5范围内，吸附效果最好，在150 min内达到吸附平衡。吸附动力学符合拟二级动力学方程，Langmuir等温吸附方程能较好地描述NH2-MCM-48对Pd2+的吸附特性，30℃静态吸附容量为59.67 mg·g-1；热力学分析结果表明，NH2-MCM-48对Pd2+的吸附是自发、吸热反应。吸附-脱附实验表明，0.1 mol·L-1 HCl+5%硫脲对Pd2+的洗脱效果好。

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