化工学报 ›› 2012, Vol. 63 ›› Issue (3): 834-840.DOI: 10.3969/j.issn.0438-1157.2012.03.023

• 分离工程 • 上一篇    下一篇

磁性交联壳聚糖对水溶液中铀(Ⅵ)离子的吸附行为

黄国林1,陈中胜1,梁喜珍1,SHI Jeffrey2   

  1. 1东华理工大学放射性地质与勘探技术国防重点学科实验室;2悉尼大学化学与生物分子工程系
  • 收稿日期:2011-07-23 出版日期:2012-03-05 发布日期:2012-03-05
  • 通讯作者: 黄国林

Adsorption behavior of U(Ⅵ) ions from aqueous solution on novel cross-linked magnetic chitosan beads

HUANG Guolin1,CHEN Zhongsheng1,LIANG Xizhen1,SHI Jeffrey2   

  • Received:2011-07-23 Online:2012-03-05 Published:2012-03-05

摘要: 采用纳米Fe3O4作为磁流体包埋、戊二醛和硫脲进行交联壳聚糖,制备磁性交联壳聚糖(TTG-MCTS)。红外光谱(FTIR)和X射线能谱(EDS)分析结果表明,壳聚糖改性后,吸附能力得到提高,铀(Ⅵ)成功地被吸附在TTG-MCTS上。系统研究了溶液pH值、铀(Ⅵ)初始浓度及振荡时间对吸附容量的影响,继而得到最佳工艺条件。吸附过程用Langmuir等温式拟合优于用Freundlich等温式,最大吸附容量为161.3 mg·g-1。较之拟一级动力学模型,拟二级动力学模型能更好地拟合实验数据。

Abstract: The performance of a novel cross-linked magnetic chitosan(TTG-MCTS),which is coated with magnetic fluids and cross-linked with glutaraldehyde and thiourea,is investigated for the adsorption of U(Ⅵ) from aqueous solutions. Infrared spectra of chitosan before and after modification show that the coating is successful and the cross-linking process is effective. The energy dispersive spectroscopy(EDS) analysis before and after adsorption indicates that U(Ⅵ) is adsorbed successfully onto the TTG-MCTS. The influences of the pH of solution,the initial concentration of U(Ⅵ) ions and the contact time on the adsorption amounts are discussed,and appropriate process conditions for the adsorption of U(Ⅵ) are obtained. Experimental equilibrium data are obtained and modeled using classical Freundlich and Langmuir adsorption isotherms. The data fits to the Langmuir isotherm better,and the uptake of U(Ⅵ) is 161.3 mg·g-1. Two simplified models including pseudo-first order and pseudo-second order equations are selected to follow the adsorption process. The experimental data for the kinetics of adsorption are correlated well with the pseudo-second order equation.

Key words: cross-linked magnetic chitosan, uranium, adsorption capacity, isotherms