北京大学学报(自然科学版)

壳聚糖衍生物的制备及其对Cr(Ⅵ)离子的吸附

刘小鹏,张剑波,王维敬,李凤   

  1. 北京大学环境学院环境科学系,北京,100871
  • 收稿日期:2002-08-29 出版日期:2003-11-20 发布日期:2003-11-20

Adsorption of Cr(Ⅵ) to Prepared Chitosan Ramifications

LIU Xiaopeng, ZHANG Jianbo, WANG Weijing, LI Feng   

  1. Department of Environmental Science, College of Environmental Science, Peking University, Beijing, 100871
  • Received:2002-08-29 Online:2003-11-20 Published:2003-11-20

摘要: 采用化学法对壳聚糖进行改性,分别制备了交联壳聚糖、丁烷基壳聚糖和O-羧甲基壳聚糖,用γ射线辐照降解制备了低摩尔质量的壳聚糖,研究了它们对废水中较难处理的污染物Cr(Ⅵ)的吸附情况,壳聚糖对Cr(Ⅵ)吸附的最佳pH值范围为5.0~6.0,最佳吸附时间大约为2h,每克壳聚糖可吸附约3mg Cr(Ⅵ),吸附率最大可达90%以上。交联壳聚糖、丁烷基壳聚糖和低摩尔质量壳聚糖对Cr(Ⅵ)的吸附效果都比壳聚糖本身要好得多:交联壳聚糖吸附1h即可达到吸附饱和;丁烷基壳聚糖吸附Cr(Ⅵ)的最佳pH值出现在5.0附近,更能适应酸性环境;辐照降解后,壳聚糖在(0.4~0.8)×105g/mol的范围内存在一个吸附最大值。

关键词: 壳聚糖衍生物, 吸附, Cr(Ⅵ), 水处理

Abstract: Crosslinked chitosan, butylchitosan and O-carboxymethyl chitosan were prepared by chemical method respectively, and some chitosan with low molar mass was abtained by using γ-ray. Their characters of adsorption Cr(Ⅵ) were observed. For chitosan, the optimum pH of adsorption Cr(Ⅵ) is 5.0~6.0; the time is 2h; 3mg Cr(Ⅵ) can be adsorbed by a gram chitosan and the adsorption rate can be up to 90%. All the adsorption abilities of crosslinked chitosan, butylchitosan and O-carboxymethyl chitosan are stronger than that of original chitosan. For examples, crosslinked chitosan may reach the adsorption saturation in 1h; the optimum pH of adsorption for butylchitosan is near 5.0, so it is more available in acidic condition. After radiation degradation, chitosan has a range of best adsorption in molar mass of (0.4~0.8)×105g/mol.

Key words: chitosan ramifications, adsorption, Cr(Ⅵ), wastewater treatment

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