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氨基修饰介孔分子筛SBA-15对水中Pb2+吸附性能

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魏建文, 韦真周, 廖雷, 赵淞盛, 王敦球. 氨基修饰介孔分子筛SBA-15对水中Pb2+吸附性能[J]. 环境工程学报, 2014, 8(5): 1825-1830.
引用本文: 魏建文, 韦真周, 廖雷, 赵淞盛, 王敦球. 氨基修饰介孔分子筛SBA-15对水中Pb2+吸附性能[J]. 环境工程学报, 2014, 8(5): 1825-1830.
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Wei Jianwen, Wei Zhenzhou, Liao Lei, Zhao Songsheng, Wang Dunqiu. Aqueous Pb(Ⅱ) removal by adsorption on amine-functionalized mesoporous silica SBA-15[J]. Chinese Journal of Environmental Engineering, 2014, 8(5): 1825-1830.
Citation: Wei Jianwen, Wei Zhenzhou, Liao Lei, Zhao Songsheng, Wang Dunqiu. Aqueous Pb(Ⅱ) removal by adsorption on amine-functionalized mesoporous silica SBA-15[J]. Chinese Journal of Environmental Engineering, 2014, 8(5): 1825-1830.
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氨基修饰介孔分子筛SBA-15对水中Pb2+吸附性能

  • 1.

    桂林理工大学环境科学与工程学院, 广西矿冶与环境科学实验中心, 桂林 541004

  • 基金项目:

    国家自然科学基金资助项目（41161075）

    广西科技厅科技攻关项目（桂科攻1140002-1-2）

  • 中图分类号: X703

Aqueous Pb(Ⅱ) removal by adsorption on amine-functionalized mesoporous silica SBA-15

  • 1.

    Guangxi Scientific Experiment Center of Mining, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China

  • Fund Project:

  • 摘要: 以二乙烯三胺基丙基三甲氧基硅烷为偶联剂，利用后修饰方法，制备出氨基修饰SBA-15。利用傅立叶红外光谱仪，N2-吸附脱附对样品结构进行表征，并讨论了吸附动力学特性及吸附等温特性。结果表明，修饰后的SBA-15吸附水中Pb2+时在120 min内可以达到吸附平衡，吸附过程符合拟二阶动力学方程。Langmuir模型及Dubinin-Radushkevich （D-R）模型很好地描述了Pb2+在修饰后SBA-15上的吸附行为，其中基于Langmuir模型计算得出的25℃时最大吸附量为84.25 mg/g。D-R模型计算得出的平均吸附自由能在25℃、35℃和45℃时分别为-13.9、-14.4和-16.0 kJ/mol，表明吸附可能属于表面络合作用，可以归为化学过程。
    Abstract: Mesoporous silica SBA-15 was functionalized by a post-synthesis method using N1-[3-(Trimethoxysiyl)propyl]diethylenetriamine as the coupling agent. The materials were characterized by Fourier-transform infrared spectroscopy (FT-IR) and N2 adsorption-desorption isotherms. Adsorption kinetics and adsorption isotherms were also studied. The adsorption capacity tends to reach equilibrium after 120 min. The results indicated that the pseudo-second-order kinetic model was found to be suited well for the entire adsorption process. Adsorption equilibrium data could be also described well by Langmuir and D-R isotherm models. Based on the Langmuir model, the maximum adsorption quantity of Pb(Ⅱ) ions was 84.25 mg/g at 25℃. The adsorption free energies of -13.9 kJ/mol, -14.4 kJ/mol and -16.0 kJ/mol were calculated with the D-R model at 25℃, 35℃ and 45℃, respectively, which indicated that the adsorption process was probably mainly a surface complexation, namely a chemsorption.
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  • 收稿日期:  2013-02-20
  • 刊出日期:  2014-05-06

氨基修饰介孔分子筛SBA-15对水中Pb2+吸附性能

  • 1. 桂林理工大学环境科学与工程学院, 广西矿冶与环境科学实验中心, 桂林 541004
  • 收稿日期:  2013-02-20
基金项目:

国家自然科学基金资助项目（41161075）

广西科技厅科技攻关项目（桂科攻1140002-1-2）

摘要: 以二乙烯三胺基丙基三甲氧基硅烷为偶联剂，利用后修饰方法，制备出氨基修饰SBA-15。利用傅立叶红外光谱仪，N2-吸附脱附对样品结构进行表征，并讨论了吸附动力学特性及吸附等温特性。结果表明，修饰后的SBA-15吸附水中Pb2+时在120 min内可以达到吸附平衡，吸附过程符合拟二阶动力学方程。Langmuir模型及Dubinin-Radushkevich （D-R）模型很好地描述了Pb2+在修饰后SBA-15上的吸附行为，其中基于Langmuir模型计算得出的25℃时最大吸附量为84.25 mg/g。D-R模型计算得出的平均吸附自由能在25℃、35℃和45℃时分别为-13.9、-14.4和-16.0 kJ/mol，表明吸附可能属于表面络合作用，可以归为化学过程。

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