College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
Molecules. 2020 Jan 31;25(3):624. doi: 10.3390/molecules25030624.
A composite flocculant P(AM-DMDAAC) was synthesized by the copolymerization of acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC). By using microwave (MV) assistance with ammonium persulfate as initiator, the synthesis had a short reaction time and yielded a product with good solubility. Fourier-transform infrared spectroscopy, scanning electron microscopy, and differential thermal analysis-thermogravimetric analysis were employed to determine the structure and morphology of P(AM-DMDAAC). The parameters affecting the intrinsic viscosity of P(AM-DMDAAC), such as MV time, mass ratio of DMDAAC to AM, bath time, reaction temperature, pH value, and the dosages of ammonium persulfate initiator, EDTA, sodium benzoate, and urea were examined. Results showed that the optimum synthesis conditions were MV time of 1.5 min, m(DMDAAC):m(AM) of 4:16, 0.5 wt‱ initiator, 0.4 wt‱ EDTA, 0.3 wt‱ sodium benzoate, 2 wt‱ urea, 4 h bath time, reaction temperature of 40 °C, and pH of 2. The optimal dimethyl phthalate (DMP) removal rate can reach 96.9% by using P(AM-DMDAAC), and the P(AM-DMDAAC) had better flocculation than PAM, PAC, and PFS.
一种复合絮凝剂 P(AM-DMDAAC)是通过丙烯酰胺 (AM) 和二甲基二烯丙基氯化铵 (DMDAAC) 的共聚合成的。采用微波 (MV) 辅助过硫酸铵作为引发剂，反应时间短，产物水溶性好。傅里叶变换红外光谱、扫描电子显微镜和差示热分析-热重分析用于确定 P(AM-DMDAAC)的结构和形态。考察了影响 P(AM-DMDAAC)特性粘度的参数，如 MV 时间、DMDAAC 与 AM 的质量比、浴时间、反应温度、pH 值以及引发剂过硫酸铵、EDTA、苯甲酸钠和尿素的用量。结果表明，最佳合成条件为 MV 时间 1.5 min、m(DMDAAC):m(AM)为 4:16、引发剂用量 0.5 wt‱、EDTA 用量 0.4 wt‱、苯甲酸钠用量 0.3 wt‱、尿素用量 2 wt‱、浴时间 4 h、反应温度 40°C、pH 值 2。使用 P(AM-DMDAAC)时，邻苯二甲酸二甲酯 (DMP) 的去除率最高可达 96.9%，且 P(AM-DMDAAC)的絮凝效果优于 PAM、PAC 和 PFS。
