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Swelling-adsorption interactions during mercury and nickel ions removal by chitosan derivatives

机译：壳聚糖衍生物去除汞和镍离子时的溶胀-吸附相互作用

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摘要

Chitosan derivatives are extensively used as adsorbents for dyes and metal ions. These materials undergo swelling after their immersion in water. The maximum adsorption potential corresponds to completely swollen material. The process rates of swelling and adsorption are comparable leading to a dependence of the apparent adsorption rate on immersion history of the material. The way of performing the adsorption experiments for this type of materials is not clear in literature raising questions on the validity of the results. To clarify the situation a total of six adsorbate-adsorbent systems is studied here with respect to the effect of the swelling degree on the adsorption kinetics. Mercury (Hg(II)) and nickel (Ni(II)) ions were selected to be the model pollutants of this work and cross-linked chitosan microspheres grafted with chlorosulfonic acid (CSSULF) or ethylenimine (CSPEI) as adsorbent materials. It is shown that the adsorption kinetics is sensitive to the time of the adsorbent immersion in water. An attempt for development of a combined swelling-adsorption model is made. It is shown that the interaction between swelling and adsorption is more complex than a single water content dependence of diffusion coefficient. The evolution of diffusion coefficient that reproduces the experimental data is derived. Differences to the behavior between the three material used, are indicated and discussed. (C) 2015 Elsevier B.V. All rights reserved.
机译：壳聚糖衍生物被广泛用作染料和金属离子的吸附剂。这些材料浸入水中后会发生溶胀。最大吸附电位对应于材料完全溶胀。溶胀和吸附的处理速率是可比的，从而导致表观吸附速率对材料的浸没历史的依赖性。对于这类材料进行吸附实验的方式在文献中尚不清楚，这引发了有关结果有效性的疑问。为了阐明这种情况，这里针对溶胀度对吸附动力学的影响研究了总共六个吸附剂-吸附剂系统。选择汞（Hg（II））和镍（Ni（II））离子作为此项工作的典型污染物，并以氯磺酸（CSSULF）或亚乙基亚胺（CSPEI）接枝的交联壳聚糖微球作为吸附材料。结果表明，吸附动力学对吸附剂浸入水中的时间敏感。尝试开发组合的溶胀-吸附模型。结果表明，溶胀和吸附之间的相互作用比扩散系数的单一水含量依赖性更为复杂。得出了再现实验数据的扩散系数的演变。指出并讨论了所使用的三种材料之间的行为差​​异。 （C）2015 Elsevier B.V.保留所有权利。

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