Adsorption of lead and humic acid on chitosan hydrogel beads.
Adsorption of lead and humic acid on chitosan hydrogel beads.
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DOI：
10.1016/j.watres.2004.11.007
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发表时间：
2005-02
期刊：
影响因子：
12.8
通讯作者：
W. Yan;R. Bai
中科院分区：
文献类型：
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作者：
W. Yan;R. Bai
研究了壳聚糖水凝胶小球对水溶液中铅离子和腐植酸的吸附行为及吸附机理。实验在室温下进行，溶液pH范围为5~7.5(近中性pH范围)。研究了三种类型的间歇吸附实验，包括单物种吸附、逐个物种的顺序吸附和两种物种的共吸附。结果表明：(1)两种物种的吸附主要是由于吸附物与水凝胶小球表面官能团的络合作用；(2)先前被吸附的物种既可以作为后续被吸附物种的额外结合部位，也可以与后续被吸附物种占据相同的结合部位，从而增强或抑制后续物种的吸附；(3)对于共吸附，金属-有机相互作用在决定吸附程度方面起着非常重要的作用。结果表明，多组分的吸附会受到吸附物相互作用的显著影响，对这些相互作用的理解是今后吸附研究中需要重点关注的问题。
Chitosan hydrogel beads were studied for the adsorption of lead ions and humic acid from aqueous solutions to examine the adsorption behaviors and mechanisms. The experiments were carried out at room temperature with solution pH ranging from 5 to 7.5 (in near neutral pH range). Three types of batch adsorption experiments, including single species adsorption, sequential adsorption of one species after another and co-adsorption of both species, were investigated. The results show that: (1) adsorption of either species mainly results from the complexations between adsorbate and functional groups at the surface of the hydrogel beads; (2) previously adsorbed species can either act as additional binding sites for, or occupy the same binding sites as the subsequent species to be adsorbed, resulting in enhanced or retarded adsorption of the subsequent species; and (3) for co-adsorption, metal-organic interactions play a very important role in determining the extent of adsorption. It is concluded that multi-species adsorption can be significantly affected by adsorbate interactions and the understanding of these interactions needs great attention in adsorption study in the future.