CSC-P(AM-AA)重金属捕集絮凝剂的光谱表征及其对重金属去除研究

Spectral Characterizations of CSC-P(AM-AA)with Function of Trapping Heavy Metals and Its Removal Efficiency of Cu^(2+)

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150r·min^(-1)时,CSC-P(AM-AA)对Cu^(2+)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 8mg·L-1,and rotation speed of 150r·min-1,the optimal removal rate of Cu2＋by CSC-P（AM-AA）was 87.0%.