高等学校化学学报

高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (03): 586.doi: 10.3969/j.issn.0251-0790.2012.03.029

• 物理化学 • 上一篇    下一篇

二乙烯三胺改性多壁碳纳米管对溶液中Au(Ⅲ)和Pd(Ⅱ)的吸附

李翠, 徐昕, 鲍长利, 王焕锋, 刘丽, 刘晓婷   

  1. 吉林大学化学学院, 长春 130012
  • 收稿日期:2011-05-16 出版日期:2012-03-10 发布日期:2012-03-10
  • 通讯作者: 鲍长利, 男, 教授, 主要从事分离和富集方面的研究. E-mail:baochangli@sina.com
  • 基金资助:

    国家自然科学基金(批准号: 50673032)资助.

Adsorption of Au(Ⅲ) and Pd(Ⅱ) in Solution of 2,2'-Diaminodiethylamine Modified Multiwalled Carbon Nanotubes

LI Cui, XU Xin, BAO Chang-Li, WANG Huan-Feng, LIU Li, LIU Xiao-Ting   

  1. College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2011-05-16 Online:2012-03-10 Published:2012-03-10

PDF (PC)

被引次数

20

摘要：

以二乙烯三胺(DETA)为改性剂, 对多壁碳纳米管(MWCNTs) 进行共价键修饰,合成了一种对Au(Ⅲ)和Pd(Ⅱ)有选择性的吸附剂MWCNTs-DETA, 并对Au(Ⅲ)和Pd(Ⅱ)的吸附参数进行了研究和优化. 结果表明, 最佳洗脱剂浓度为1.0 mol/L 硫脲-1.0 mol/L 盐酸, Au(Ⅲ)和Pd(Ⅱ)的洗脱率分别为94.48%和89.06%, 最佳条件下Au(Ⅲ)和Pd(Ⅱ)的饱和吸附容量分别为50.45和25.68 mg/g. 在对吸附等温线的考察中, Au(Ⅲ)拟合Langmuir等温线较好, 而Pd(Ⅱ)则拟合Freundlich等温线较好. 吸附动力学均拟合二级模型较好.

关键词: 多壁碳纳米管, 二乙烯三胺, 修饰, 吸附, 贵金属离子

Abstract:

2,2'-Diaminodiethylamine(DETA) covalently modified multi-walled carbon nanotubes(MWCNTs-DETA) were synthesized and used for the adsorption of Au(Ⅲ) and Pd(Ⅱ). The experimental parameters affecting the adsorption capacities were studied and optimized. The highest elution ratios were determined as 94.48% for Au(Ⅲ) and 89.06% for Pd(Ⅱ) using 1.0 mol/L thiourea-hydrochloric acid solution as the eluent. Under the optimal experimental conditions, the maximum adsorption capacities for Au(Ⅲ) and Pd(Ⅱ) were 50.45 and 25.68 mg/g, respectively. Langmuir isotherm model agreed well with the equili-brium experimental data of Au(Ⅲ) while Freundlich isotherm model agreed with those of Pd(Ⅱ). Adsorption kinetics of Au(Ⅲ) and Pd(Ⅱ) could be well described by the pseudo-second-order model.

Key words: Multiwalled carbon nanotube(MWCNTs), 2,2’-Diaminodiethylamine(DETA), Modification, Adsorption, Precious metal ion

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