掺杂聚乙烯醇的壳聚糖小球对铜离子-腐殖酸的单一和连续吸附行为
发布时间：2019-06-06 16:43
【摘要】：以三聚磷酸钠作为离子交联剂,合成了一种掺杂聚乙烯醇的壳聚糖小球,采用SEM和FTIR表征了小球的表面性能及官能团分布情况,进一步研究了这种小球对腐殖酸和铜离子的单独吸附行为、连续吸附行为及两者共存状态下的吸附行为,并通过XPS能谱分析了吸附过程的机理.结果表明:在单独吸附过程中,壳聚糖小球与腐殖酸和铜的作用方式主要是通过静电引力和络合作用;在连续吸附过程中,先吸附了腐殖酸的小球,后续对铜离子的吸附效果变弱;而先吸附了铜离子的小球,后续对腐殖酸的吸附能力变强,说明这种小球在吸附过程中可以被连续使用.而在腐殖酸和铜离子共存的吸附实验中发现,壳聚糖小球除了会吸附溶液中的铜离子和腐殖酸外,还导致它们的聚集沉降.
[Abstract]:A kind of chitosan microspheres doped with polyvinyl alcohol was synthesized by using sodium tripolyphosphate as ion crosslinker. The surface properties and functional group distribution of the microspheres were characterized by SEM and FTIR. The adsorption behavior, continuous adsorption behavior and adsorption behavior of humic acid and copper ions by the pellets were further studied, and the mechanism of the adsorption process was analyzed by XPS energy spectrum. The results show that in the process of adsorption alone, the interaction of chitosan pellets with humic acid and copper is mainly through electrostatic gravity and complexation. In the process of continuous adsorption, humic acid pellets were adsorbed first, and then the adsorption effect of copper ions became weaker. The microspheres adsorbed copper ions first, and then the adsorption capacity of humic acid became stronger, which indicated that the microspheres could be used continuously in the adsorption process. In the adsorption experiment of the coexistence of humic acid and copper ion, it was found that chitosan microspheres not only adsorbed copper ion and humic acid in solution, but also led to their aggregation and deposition.
【作者单位】： 湖南大学环境科学与工程学院环境生物与控制教育部重点实验室;
【基金】：国家自然科学基金(No.51579095)~~
【分类号】：O647.3;X52
，
本文编号：2494450
[Abstract]:A kind of chitosan microspheres doped with polyvinyl alcohol was synthesized by using sodium tripolyphosphate as ion crosslinker. The surface properties and functional group distribution of the microspheres were characterized by SEM and FTIR. The adsorption behavior, continuous adsorption behavior and adsorption behavior of humic acid and copper ions by the pellets were further studied, and the mechanism of the adsorption process was analyzed by XPS energy spectrum. The results show that in the process of adsorption alone, the interaction of chitosan pellets with humic acid and copper is mainly through electrostatic gravity and complexation. In the process of continuous adsorption, humic acid pellets were adsorbed first, and then the adsorption effect of copper ions became weaker. The microspheres adsorbed copper ions first, and then the adsorption capacity of humic acid became stronger, which indicated that the microspheres could be used continuously in the adsorption process. In the adsorption experiment of the coexistence of humic acid and copper ion, it was found that chitosan microspheres not only adsorbed copper ion and humic acid in solution, but also led to their aggregation and deposition.
【作者单位】： 湖南大学环境科学与工程学院环境生物与控制教育部重点实验室;
【基金】：国家自然科学基金(No.51579095)~~
【分类号】：O647.3;X52
，
本文编号：2494450
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