研究报告
杨虎城,龚继来,曾光明.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[J].环境科学学报,2017,37(10):3735-3745
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
- Single and continuous adsorption behavior of copper ion humic acid with chitosan blended with polyvinyl alcohol
- 基金项目：国家自然科学基金（No.51579095）
- 作者
- 单位
- 杨虎城
- 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, 长沙 410082
- 龚继来
- 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, 长沙 410082
- 曾光明
- 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, 长沙 410082
- 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：In this study, polyvinyl alcohol (PVA)/chitosan STPP beads (PVA/CS beads) were successfully synthesized and the surface properties as well as the distribution of functional groups were analyzed by scanning electron microscopy (SEM) and fourier transform infrared spectrum (FTIR). The beads were applied for adsorption of copper and humic acid (HA) in single component, sequential adsorption and simultaneous adsorption experiments. The adsorption mechanisms were probed mainly by XPS and the results reveal that in single component adsorption,the interactions between adsorbate and adsorbent consist of both complexation and electrostatic attraction. In sequential adsorption, the pre-adsorption of copper on PVA/CS beads could promote the sequential adsorption of HA. While the pre-adsorption of HA on PCS beads inhibited the adsorption of copper. This indicates that the adsorbate can be used in sequence. Furthermore, in simultaneous adsorption, the PCS beads not only absorbed, but also caused the aggregation and sedimentation of copper ions and HA.
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