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›› 2008, Vol. 8 ›› Issue (1): 60-64.

• 反应与分离 • 上一篇    下一篇

新型交联壳聚糖树脂颗粒对铂的吸附行为

党明岩,张廷安,王娉,李薇,谭艳坤,贺燕   

  1. 沈阳理工大学环境与化学工程学院
  • 出版日期:2008-02-20 发布日期:2008-02-20

Adsorption of Platinum by Novel Cross-linked Chitosan Resin Particles

DANG Ming-yan,ZHANG Ting-an,WANG Ping,LI Wei,TAN Yan-kun,HE Yan   

  1. School of Environment & Chemical Engineering,Shenyang Ligong University
  • Online:2008-02-20 Published:2008-02-20

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摘要： 以甲醛为预交联剂、环硫氯丙烷为交联剂，合成了新型交联壳聚糖树脂，用扫描电镜、X射线衍射仪及红外光谱表征了树脂的结构，考察了交联剂用量对铂吸附量的影响，研究了树脂对铂的吸附动力学、等温吸附特性及解吸特性. 结果表明，壳聚糖与交联剂的最佳用量比为壳聚糖:甲醛:环硫氯丙烷=1 g:7 mL:2 mL；树脂吸附铂的动力学符合Boyd液膜扩散方程，其吸附控制过程以液膜扩散为主，表观吸附活化能为14.28 kJ/mol，其等温吸附过程符合Freundlich等温吸附方程；以硫脲(1%)-盐酸(1 mol/L)作为铂的解吸剂，解吸时间为1 h，解吸率达到99.75%.

关键词: 壳聚糖, 交联, 吸附, 解吸, 铂

Abstract: Formaldehyde and chloromethyl thiirane were used to synthesize a novel cross-linked chitosan resin with adsorption ability to platinum. The structure of the resin was characterized by using SEM and XPS techniques, the effect of dosage of cross-linking agents on adsorption of platinum in Pt-containing solution was investigated, and adsorption kinetics, properties of isothermal adsorption and desorption were also studied. The results show that the optimum ratio of dosages for chitosan:formaldehyde:chloromethyl thiirane is 1 g:7 mL:2 mL. The adsorption kinetics follows Boyd liquid film diffusion model, liquid film diffusion is the control procedure, and apparent activation energy of adsorption is 14.28 kJ/mol. The isothermal adsorption follows the isothermal adsorption equations of Freundlich. Thiourea (1%)-hydrochloric acid (1 mol/L) was used to be desorption agent, and the desorption rate of adsorbed platinum could reach to 99.75% for 1 h.

Key words: chitosan, cross-linking, adsorption, desorption, platinum