College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China; Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, College of Environment, Nanjing Tech University, Nanjing, 211800, China.
College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China.
Carbohydr Polym. 2017 May 15;164:222-232. doi: 10.1016/j.carbpol.2017.02.010. Epub 2017 Feb 3.
In this work, a highly efficient and environmentally friendly chitosan-based graft flocculant, namely, acrylamide- and dimethyl diallyl ammonium chloride-grafted chitosan [CS-g-P(AM-DMDAAC)], was prepared successfully through plasma initiation. FTIR results confirmed the successful polymerization of CS-g-P(AM-DMDAAC) and P(AM-DMDAAC). P(AM-DMDAAC) was the copolymer of acrylamide- and dimethyl diallyl ammonium chloride. SEM results revealed that a densely cross-linked network structure formed on the surface. XRD results verified that the ordered crystal structure of chitosan in CS-g-P(AM-DMDAAC) was changed into an amorphous structure after plasma-induced polymerization. The flocculation results of low-algal-turbidity water further showed the optimal flocculation efficiency of turbidity removal rate, COD removal rate, and Chl-a removal rate were 99.02%, 96.11%, and 92.20%, respectively. The flocculation efficiency of CS-g-P(AM-DMDAAC) were significantly higher than those obtained by cationic polyacrylamide (CPAM) and Polymeric aluminum and iron (PAFC). This work provided a valuable basis for the design of eco-friendly naturally modified polymeric flocculants to enhance the flocculation of low-algal-turbidity water.
在这项工作中，通过等离子体引发成功制备了一种高效、环保的壳聚糖接枝絮凝剂，即丙烯酰胺和二甲基二烯丙基氯化铵接枝壳聚糖[CS-g-P(AM-DMDAAC)]。傅里叶变换红外光谱（FTIR）结果证实了 CS-g-P(AM-DMDAAC)和 P(AM-DMDAAC)的成功聚合。P(AM-DMDAAC)是丙烯酰胺和二甲基二烯丙基氯化铵的共聚物。扫描电子显微镜（SEM）结果表明，在表面形成了密集的交联网络结构。X 射线衍射（XRD）结果验证了壳聚糖在 CS-g-P(AM-DMDAAC)中的有序晶体结构在等离子体引发聚合后变为无定形结构。低浊度水的絮凝结果进一步表明，浊度去除率、COD 去除率和 Chl-a 去除率的最佳絮凝效率分别为 99.02%、96.11%和 92.20%。CS-g-P(AM-DMDAAC)的絮凝效率明显高于阳离子聚丙烯酰胺（CPAM）和聚合铝铁（PAFC）的絮凝效率。这项工作为设计环保的天然改性聚合物絮凝剂以增强低浊度水的絮凝提供了有价值的基础。
