Adsorption of Pb(II)and Cu(II)Ions by Cross-Linked Chitosan Beads

doi:10.7652/xjtuxb201311022

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Adsorption of Pb(II)and Cu(II)Ions by Cross-Linked Chitosan Beads

更新时间：2025-07-09

- Adsorption of Pb(II)and Cu(II)Ions by Cross-Linked Chitosan Beads
- Vol. 47, Issue 11, Pages: 127-132(2013)
- 作者机构：
  
  西安交通大学理学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201311022
  CLC： O636.1
- Online First：10 November 2013，
  
  Published：2013
- 稿件说明：
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Adsorption of Pb(II)and Cu(II)Ions by Cross-Linked Chitosan Beads[J]. 2013, 47(11): 127-132.
DOI：

Adsorption of Pb(II)and Cu(II)Ions by Cross-Linked Chitosan Beads[J]. 2013, 47(11): 127-132. DOI： 10.7652/xjtuxb201311022.

摘要

针对壳聚糖上的氨基在酸性溶液中易质子化

从而限制了应用的问题

对壳聚糖的交联改性进行了研究。首先用柠檬酸三钠和环氧氯丙烷为交联剂制备了改性壳聚糖(CTS-CA-ECH)珠粒

然后运用热重分析、红外光谱和X射线衍射等手段进行了表征

由此探讨了pH值、温度、吸附时间、离子溶液初始浓度对CTS-CA-ECH珠粒吸附铜和铅离子的影响

研究了CTS-CA-ECH对铜和铅离子的吸附动力学和吸附等温特性

并进行了吸附剂的再生实验。结果表明:改性后的壳聚糖对铜和铅离子的吸附可由二级吸附动力学和Langmuir吸附等温模型描述

CTS-CA-ECH珠粒具有良好的再生吸附性能。

Abstract

For the facts that the amino groups in chitosan(CTS)are prone to be protonated and the application of chitosan in water treatment is therefore greatly limited

modification of chitosan via cross-linking was carried out in this study. Modified CTS beads were prepared using sodium citrate(CA)and epichlorohydrin(ECH)as cross-linkers. The chemical structure of the cross-linked chitosan beads was characterized by TGA

FTIR spectroscopy and XRD. The effects of pH value

temperature

contact time and initial concentration of metal ions on the adsorption of Cu(II)and Pb(II)ions by CTS-CA-ECH beads were investigated. The adsorption kinetics was evaluated using the pseudo-first-order and pseudo-second-order models

and the adsorption equilibrium isotherms were examined by Langmuir and Freundlich models. The desorption and regeneration tests were performed. The results show that the adsorption process fits well with the pseudo-second-order kinetic model

and the adsorption equilibrium isotherms agree well with the Langmuir models. The present adsorbent has excellent reusability for the adsorption of Cu(II)and Pb(II)ions.

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references

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