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CO2-Responsive Graft Modified Chitosan for Heavy Metal (Nickel) Recovery

机译:CO2响应接枝改性壳聚糖为重金属(镍)回收

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摘要

Chitosan was chemically functionalized with poly(diethylaminoethyl methacrylate) (PDEAEMA) using a grafting to approach to produce a CO2-responsive material for adsorbing metals from wastewater streams. A need for improved economical and greener approaches to recover heavy metals from wastewater streams exists due to increasing resource scarcity. Chitosan is currently used as an adsorbent for heavy metals but suffers from some properties that can be disadvantageous to its effectiveness; it is difficult to effectively disperse in water (which limits available surface area) and to regenerate. We set out to improve its effectiveness by grafting CO2-responsive tertiary amine containing polymers onto the chitosan backbone, with the goals of preparing and assessing a new type of adsorbent based on a novel concept; using carbon dioxide switchable polymers to enhance the performance of chitosan. PDEAEMA chains prepared by nitroxide-mediated polymerization were grafted onto chitosan functionalized with glycidyl methacrylate. In carbonated water, the grafted chitosan displayed improved dispersibility and exhibited a Ni(II) adsorption capacity higher than several other chemically functionalized chitosan variants reported in the literature with the regenerated material having a higher capacity than all physical and chemical derivatives reported in the literature. The results of this study validate the continued development of this material for applications in heavy metal removal and recovery from wastewater streams.
机译:使用嫁接方法用聚(二乙基氨基甲基丙烯酸甲基丙烯酸甲酯)(PDEAEMA)化学官能化,以产生用于吸附来自废水流的CO2响应材料。由于资源稀缺的增加,对从废水流中恢复重金属的改进的经济和更环保的方法。壳聚糖目前用作重金属的吸附剂,但患有对其有效性不利的一些性质;难以有效地分散在水中(限制可用表面积)并再生。我们首先通过将含二氧化碳浓度的叔胺聚合物移植到壳聚糖骨架上,提高其有效性,其基于新颖的概念制备和评估新型吸附剂的目标;用二氧化碳可切换聚合物增强壳聚糖的性能。将通过己酰基介导的聚合制备的PDeAMA链嫁接到用甲基丙烯酸缩水甘油酯官能化的壳聚糖上。在碳酸水中,接枝的壳聚糖显示出改善的分散性,并表现出高于几种其他化学官能化的壳聚糖变体的Ni(II)的吸附能力,其具有比文献中报道的所有物理和化学衍生物更高的容量的再生材料。本研究的结果验证了这种材料的持续发展,用于从废水流中的重金属去除和回收中的应用。

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