高强度水凝胶作为一种可重复使用的铜离子吸附剂。
High-strength hydrogel as a reusable adsorbent of copper ions.
机构信息
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China.
出版信息
J Hazard Mater. 2012 Apr 30;213-214:258-64. doi: 10.1016/j.jhazmat.2012.01.092. Epub 2012 Feb 6.
A mechanically strong hydrogel was prepared by photoinitiated polymerization of oligo(ethylene glycol) methacrylate (OEGMA), 2-vinyl-4,6-diamino-1,3,5-triazine (VDT) and cross-linker N,N'-methylenebisacrylamide (MBAA). Introduction of the monomer VDT considerably strengthened the mechanical properties of the hydrogel by self-hydrogen bonding of diaminotriazine, and enhanced the adsorption of copper ion onto the hydrogel by chelation between amino groups and metal ion. Adsorption studies were carried out by varying the OEGMA/VDT ratio, contact time, pH value, counterion and initial concentration of Cu(2+) ions. The evaluation of adsorption properties showed that the hydrogel exhibited better correlation with Langmuir isotherm model. This adsorbent could be used repeatedly with little loss in adsorption capacity.
一种机械强度高的水凝胶是通过引发聚合聚乙二醇甲基丙烯酸酯（OEGMA）、2-乙烯基-4,6-二氨基-1,3,5-三嗪（VDT）和交联剂 N,N'-亚甲基双丙烯酰胺（MBAA）制备的。单体 VDT 的引入通过二氨基三嗪的自氢键作用极大地增强了水凝胶的机械性能，并通过氨基和金属离子之间的螯合作用增强了铜离子对水凝胶的吸附。通过改变 OEGMA/VDT 比、接触时间、pH 值、抗衡离子和 Cu(2+)初始浓度来进行吸附研究。吸附性能的评估表明，水凝胶与朗缪尔等温模型具有更好的相关性。这种吸附剂可以重复使用，而吸附容量损失很小。
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