采用光聚合技术成功制备了羧甲基壳聚糖(CSC)、 丙烯酰胺(AM)、 丙烯酸(AA)的三元接枝共聚物, 即壳聚糖基重金属捕集絮凝剂CSC-P(AM-AA)。 为了证明接枝共聚产物的成功制备和表征其结构特征, 采用红外光谱(IR)、 X射线衍射(XRD)、 差热-热重分析(TG-DSC)、 扫描电镜(SEM)对其进行表征, 结果表明成功制备出羧甲基壳聚糖的接枝共聚物CSC-P(AM-AA), 且具有较好的溶解性； 由于羧甲基壳聚糖的接枝改性使得CSC-P(AM-AA)具有与P(AM-AA)显著不同的结构特征。 同时絮凝实验证明其具有较好的重金属螯合捕集效果, 在pH为8、 投加量为8 mg·L-1、 转速为150 r·min-1时, CSC-P(AM-AA)对Cu2+的最佳去除率为87.0%。

In this paper, the graft terpolymer, which is called Chitosan-based heavy metal capture flocculant CSC-P(AM-AA), of carboxymethyl chitosan (CSC) and acrylamide (AM) and acrylic acid (AA) were successfully prepared by photopolymerization. In order to demonstrate the successful preparation and characterization of the graft copolymer, the IR spectra, XRD, TG-DSC, and scanning electron microscopy (SEM) were used to characterize the product polymer. The results showed that the graft copolymer of CSC-P (AM-AA) was successfully prepared, and the graft copolymer had good soluble ability. In addition, P (AM-AA) had a structural characteristics that were significantly different from those of P(AM-AA), due to the graft polymerization of carboxymethyl chitosan. The flocculation results showed that CSC-P(AM-AA) had good heavy metal removal performance. At pH 8, dosage of 8 mg·L-1, and rotation speed of 150 r·min-1, the optimal removal rate of Cu2+ by CSC-P(AM-AA) was 87.0%.