A novel inorganic–organic composite flocculant was prepared with polyaluminum chloride (PAC) and poly(methacrylamido propyl trimethyl ammonium chloride) (PMAPTAC). To understand the physicochemical characterization of PAC/PMAPTAC and evaluate its flocculation efficiency, the interactions of PAC and cationic polymer were investigated, then the characterization and flocculation performance of PAC/PMAPTAC and PAC/Poly-dimethyldiallylammonium chloride (PDMDAAC) were compared. The results showed that there were obvious interactions between PAC and cationic polymer in composite flocculant. The cationic polymer chain exhibited a coiled state in PAC solution, and the curly degree of PMAPTAC chain was lower than that of PDMDAAC due to the intermolecular association of methyl of PMAPTAC. The cationic polymer enhanced the charge neutralization ability of PAC and changed the aluminum hydrolysis polymerization species of PAC from low and medium polymeric species to high-polymeric species. The flocculation sedimentation experiments turned out that the charge neutralization and bridging ability of PAC/PMAPTAC was higher than that of PAC/PDMDAAC, and the increase of molecular weight or content of PMAPTAC in PAC/PMAPTAC could enhance the charge neutralization and adsorption bridging ability simultaneously. The enhanced effects may come from the exist of polymer and the interactions between PAC and cationic polymer in composite flocculant.

中文翻译：

---

PAC/PMAPTAC复合絮凝剂的理化表征及絮凝性能评价

以聚氯化铝（PAC）和聚（甲基丙烯酰胺丙基三甲基氯化铵）（PMAPTAC）为原料制备了一种新型无机-有机复合絮凝剂。为了了解PAC/PMAPTAC的理化特性并评价其絮凝效率，研究了PAC与阳离子聚合物的相互作用，然后比较了PAC/PMAPTAC和PAC/聚二甲基二烯丙基氯化铵（PDMDAAC）的特性和絮凝性能。结果表明，复合絮凝剂中PAC与阳离子聚合物之间存在明显的相互作用。阳离子聚合物链在PAC溶液中呈卷曲状态，由于PMAPTAC甲基的分子间缔合，PMAPTAC链的卷曲度低于PDMDAAC。阳离子聚合物增强了PAC的电荷中和能力，使PAC的铝水解聚合物种从低、中聚合物种转变为高聚合物种。絮凝沉淀实验结果表明，PAC/PMAPTAC的电荷中和和架桥能力高于PAC/PDMDAAC，并且增加PAC/PMAPTAC中PMAPTAC的分子量或含量可以同时增强电荷中和和吸附架桥能力. 增强效果可能来自聚合物的存在以及复合絮凝剂中PAC与阳离子聚合物之间的相互作用。絮凝沉淀实验结果表明，PAC/PMAPTAC的电荷中和和架桥能力高于PAC/PDMDAAC，并且增加PAC/PMAPTAC中PMAPTAC的分子量或含量可以同时增强电荷中和和吸附架桥能力. 增强效果可能来自聚合物的存在以及复合絮凝剂中PAC与阳离子聚合物之间的相互作用。絮凝沉淀实验结果表明，PAC/PMAPTAC的电荷中和和架桥能力高于PAC/PDMDAAC，并且增加PAC/PMAPTAC中PMAPTAC的分子量或含量可以同时增强电荷中和和吸附架桥能力. 增强效果可能来自聚合物的存在以及复合絮凝剂中PAC与阳离子聚合物之间的相互作用。