State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
Water Res. 2017 Jul 1;118:160-166. doi: 10.1016/j.watres.2017.04.032. Epub 2017 Apr 18.
The molecular structure of a material substantially determines its final application performance. In this work, a series of starch-based flocculants with different charge densities and average graft chain lengths were prepared by the co-graft polymerization of acrylamide and [(2-methacryloyloxyethyl) trimethyl ammonium chloride] (St-g-PAM-co-PDMC). The flocculation performance of St-g-PAM-co-PDMC was studied systematically at neutral pH using kaolin suspension and sodium humate (NaHA) aqueous solution as synthetic wastewaters. The effects of the two structural factors on the flocculation efficiency of the starch-based flocculants have been investigated. The experimental results showed that the charge density and average graft chain length contributed distinctly to flocculation performance during the removal of both kaolin particles and NaHA under insufficient and excessive flocculant dose conditions. The flocculation mechanisms of this starch-based flocculant were discussed in detail on the basis of the structure-activity relationship, which are significant to optimize the flocculation conditions and guide the development of novel high-performance flocculants.
物质的分子结构在很大程度上决定了其最终的应用性能。在这项工作中，通过丙烯酰胺和[(2-甲基丙烯酰氧乙基)三甲基氯化铵]（St-g-PAM-co-PDMC）的共接枝聚合，制备了一系列具有不同电荷密度和平均接枝链长的淀粉基絮凝剂。在中性 pH 下，使用高岭土悬浮液和腐植酸钠（NaHA）水溶液作为合成废水，系统地研究了 St-g-PAM-co-PDMC 的絮凝性能。考察了这两个结构因素对淀粉基絮凝剂絮凝效率的影响。实验结果表明，在不足和过量絮凝剂剂量条件下，电荷密度和平均接枝链长对高岭土颗粒和 NaHA 的去除均有明显的贡献。基于结构-活性关系，详细讨论了这种淀粉基絮凝剂的絮凝机理，这对于优化絮凝条件和指导新型高性能絮凝剂的开发具有重要意义。
