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表面印迹材料对水中Cd(Ⅱ)的吸附动力学

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李璐玮, 祝方, 任腾飞, 欧文波, 路晏红, 李惠斌, 翟斌. 表面印迹材料对水中Cd(Ⅱ)的吸附动力学[J]. 环境化学, 2016, 35(4): 793-799. doi: 10.7524/j.issn.0254-6108.2016.04.2015102603
引用本文: 李璐玮, 祝方, 任腾飞, 欧文波, 路晏红, 李惠斌, 翟斌. 表面印迹材料对水中Cd(Ⅱ)的吸附动力学[J]. 环境化学, 2016, 35(4): 793-799. doi: 10.7524/j.issn.0254-6108.2016.04.2015102603
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LI Luwei, ZHU Fang, REN Tengfei, OU Wenbo, LU Yanhong, LI Huibin, ZHAI Bin. Adsorption kinetics of Cd(Ⅱ) ions from water by surface imprinted polymers[J]. Environmental Chemistry, 2016, 35(4): 793-799. doi: 10.7524/j.issn.0254-6108.2016.04.2015102603
Citation: LI Luwei, ZHU Fang, REN Tengfei, OU Wenbo, LU Yanhong, LI Huibin, ZHAI Bin. Adsorption kinetics of Cd(Ⅱ) ions from water by surface imprinted polymers[J]. Environmental Chemistry, 2016, 35(4): 793-799. doi: 10.7524/j.issn.0254-6108.2016.04.2015102603
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表面印迹材料对水中Cd(Ⅱ)的吸附动力学

  • 1.

    太原理工大学环境科学与工程学院, 太原, 030024

  • 基金项目:

    国家自然科学基金(21276174),山西省基础研究计划项目(2013011040-1)资助.

Adsorption kinetics of Cd(Ⅱ) ions from water by surface imprinted polymers

  • 1.

    College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

  • Fund Project: Supported by the National Science Foundation of China (21276174) and Basic Research Project in Shanxi Province (2013011040-1).

  • 摘要: 采用表面印迹技术,以硅胶为载体、Cd(Ⅱ)为模板离子、γ-脲基丙基三甲氧基硅烷为偶联剂和功能单体、环氧氯丙烷为交联剂,合成了脲基功能化的镉离子表面印迹材料.用制备好的印迹材料为吸附剂进行静态吸附实验,考察了溶液的不同pH值、反应时间、温度和Cd(Ⅱ)的初始浓度等因素对镉离子吸附效果的影响.并用准一级动力学和准二级动力学对实验数据进行拟合,计算出相应的速率常数.结果表明,表面印迹材料对Cd(Ⅱ)的吸附是一个快速的过程,在20 min内即可达到吸附平衡,且准二级动力学方程(R2>0.99)能更好地描述其吸附动力学行为.吸附等温线符合Langmuir等温吸附模型,这表明了吸附过程是以单层吸附为主.在最佳的吸附条件下,Cr(Ⅱ)的吸附量可达到83 mg·g-1.此外吸附热力学研究表明该吸附过程是一个自发的、吸热过程.
    Abstract: Urea-functionalized cadmium ion imprinted polymer was synthesized by surface imprinting technique with Cd(Ⅱ) as the template, silica gel as carrier, epichlorohydrin as the crosslinking agent, γ-ureidopropyltrimethoxysilane as coupling agent and functional monomer. The influence of pH value, time, temperature and Cd(Ⅱ) initial concentration on the adsorption were investigated in static adsorption experiments. In addition, pseudo-first-order and pseudo-second-order models were used to illustrate the adsorption kinetic behavior, and the characteristic rate constants were presented, respectively. Results showed that the pseudo-second-order model(R2>0.99)had the best agreement with the experimental data. Moreover, the adsorption was a fast process and the adsorption equilibrium was reached within 20 minutes. Langmuir adsorption isotherm model described the experimental data well, which indicated that the adsorption was mainly monolayer adsorption. The adsorption capacity reached 83 mg·g-1 under the optimal conditions. Furthermore, the adsorption thermodynamics suggested that the adsorption process was spontaneous and endothermic.
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  • 收稿日期:  2015-10-26
  • 刊出日期:  2016-04-15

表面印迹材料对水中Cd(Ⅱ)的吸附动力学

  • 1. 太原理工大学环境科学与工程学院, 太原, 030024
  • 收稿日期:  2015-10-26
基金项目:

国家自然科学基金(21276174),山西省基础研究计划项目(2013011040-1)资助.

摘要: 采用表面印迹技术,以硅胶为载体、Cd(Ⅱ)为模板离子、γ-脲基丙基三甲氧基硅烷为偶联剂和功能单体、环氧氯丙烷为交联剂,合成了脲基功能化的镉离子表面印迹材料.用制备好的印迹材料为吸附剂进行静态吸附实验,考察了溶液的不同pH值、反应时间、温度和Cd(Ⅱ)的初始浓度等因素对镉离子吸附效果的影响.并用准一级动力学和准二级动力学对实验数据进行拟合,计算出相应的速率常数.结果表明,表面印迹材料对Cd(Ⅱ)的吸附是一个快速的过程,在20 min内即可达到吸附平衡,且准二级动力学方程(R2>0.99)能更好地描述其吸附动力学行为.吸附等温线符合Langmuir等温吸附模型,这表明了吸附过程是以单层吸附为主.在最佳的吸附条件下,Cr(Ⅱ)的吸附量可达到83 mg·g-1.此外吸附热力学研究表明该吸附过程是一个自发的、吸热过程.

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