壳聚糖的吸附行为及其FTIR光谱研究

Adsorption Behaviors of Chitosan and the Analysis of FTIR Spectra

用自制的壳聚糖对几种酸性染料和碱性染料模拟废水进行了吸附行为的研究,考察了吸附时间、壳聚糖脱已酰度及废水pH值对吸附效果的影响。研究表明,在吸附开始的20min内,壳聚糖对碱性品红和番红花红的吸附已基本达到平衡,且用量只为活性炭用量的2/3的情况下,对染料的吸附效果与活性炭几乎相当;它对酸性大红的吸附过程呈现一级反应动力学特征。文章还采用傅里叶变换红外光谱对壳聚糖吸附染料的机理进行了探讨,研究发现,壳聚糖分子中存在的大量羟基参与了对碱性品红和番红花红的吸附。

This paper studied the adsorption behavior of lab-made chitosan for acid dyeing waste water and basic dyeing waste waters, based on the effects of adsorbing time, deacetylation degree of chitosan, and pH of waste water. The results showed that the adsorption of basic fuchsin and saffron by the chitosan almost reached equilibrium state in 20 min. The adsorption capacities of the chitosan for dyes was comparable with activated carbon. Moreover, its dosages were only 2/3 of the latter. The adsorption process for Acid Red presented a dynamics character of first order reaction. FTIR spectroscopy was used to analyze the adsorption mechanisms of chitosan for different kinds of dyes. It was found that a great deal of hydroxide radicals in the chitosan molecule participated in the adsorption of basic fuchsin and saffron.