顾海欣,施文健,吴薇,王精志,杨琴淋.壳聚糖交联β-环糊精对水中铬酸盐的吸附研究[J].环境科学学报,2014,34(9):2233-2239
壳聚糖交联β-环糊精对水中铬酸盐的吸附研究
- Research on the adsorption of chromate on CTS-CD in aqueous solution
- 基金项目：国家自然科学基金（No.10872133）
- 顾海欣
- 上海理工大学环境与建筑学院, 上海 200093
- 施文健
- 上海理工大学环境与建筑学院, 上海 200093
- 吴薇
- 上海理工大学环境与建筑学院, 上海 200093
- 王精志
- 上海理工大学环境与建筑学院, 上海 200093
- 杨琴淋
- 上海理工大学环境与建筑学院, 上海 200093
- 摘要：以戊二醛为交联剂，通过在壳聚糖分子链上引入β-环糊精，制备出壳聚糖交联β-环糊精高聚物（CTS-CD），并研究了CTS-CD对水中铬酸盐的吸附性能.实验结果表明，在pH=5、318 K的条件下，CTS-CD对铬酸盐的饱和吸附容量为105 mg·g-1；吸附过程符合Lagergren二级动力学模型，吸附速率常数随温度的升高而增大，其表观活化能为32.2 kJ·mol-1；吸附等温模型符合Langmuir等温式，为单分子层吸附；吸附铬酸盐的ΔH、ΔS、ΔG 分别为40.6 kJ·mol-1、158 J·mol-1·K-1、-9.54 kJ·mol-1，表明CTS-CD对水中铬酸盐的吸附主要为化学吸附.
- Abstract：Chitosan-β-cyclodextrin polymer (CTS-CD), a kind of natural polymer, was synthesized by immobi-lizing β-cyclodextrin (β-CD) onto the molecular structure of chitosan by the cross-linking function of glutar-aldehyde. The adsorption properties of chromate on CTS-CD in drinking water were investigated. The experiment results showed that at 318 K, pH of 5, the saturated adsorption capacity of chromate on CTS-CD was 105 mg·g-1. Furthermore, the adsorption process fitted pseudo-second-order kinetics model and the adsorption rate constant increased with the temperature. The apparent activation energy of the adsorption was 32.2 kJ·mol-1. The adsorption pattern fitted Langmuir isotherms, which was monomolecular layer adsorption. ΔH,ΔS and ΔG of the adsorption were 40.6 kJ·mol-1,158 J·mol-1·K-1 and -9.54 kJ·mol-1, respectively.The experimental results showed that the adsorption was mainly chemical adsorption.
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