模板分子量对阳离子聚丙烯酰胺序列结构及其絮凝性能的影响

The effect of molecular weight of templates on the sequence structure and the sludge dewatering performance of P(AM-DMC)

论文通过紫外光引发模板聚合的方式,以不同分子量(3000、5200、8000g/mol)的阴离子聚丙烯酸钠(PAAS)作为模板,丙烯酰胺(AM)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)为共聚单体,在最佳配比条件下,制备得到了三组不同模板分子量的聚合物T3PDA、T5PDA、T8PDA,并通过红外光谱(FTIR)、差热-热重(TGA-DSC)、核磁共振氢谱(1H-NMR)和核磁共振碳谱(13C-NMR)进一步分析了T3PDA、T5PDA、T8PDA的结构特征。然后将三组不同模板分子量的聚合物CPAM用于城市污水处理厂的二沉池剩余活性污泥活性絮凝脱水的研究。实验结果表明,当模板分子量为5200g/mol时,T5PDA展示出最佳的絮凝脱水效果。此时,污泥处理过后的上清液的剩余浊度、zeta电位、泥饼含水率和污泥比阻(SRF)达到了最优。

Methacryloxyethyl trimethyl ammoium chloride（DMC） as monomers,and sodium polyacrylate（PAAS） as template.When the MW of the template PAAS was 3000,5200 and 8000 g/mol,the corresponding copolymers was denoted as T3PDA,T5PDA and T8PDA,respectively.The sequence structure of properties T3PDA,T5PDA and T8PDA were further characterize by FTIR,TGADSC,1H-NMR and 13C-NMR.The results indicated that the products（T3PDA,T5PDA and T8PDA） were the template copolymer of AM and DMC.Finally,the sludge dewatering performance of the flocculants was evaluated in terms of supernatant turbidity,electric potential moisture content of sludge cake and SRF.The results demonstrated that the copolymer（T5PDA） with a template MW of 5200 g/mol showed the most excellent sludge flocculation performance.