摘要
采用过硫酸铵((NH_4)_2S_2O_8)-亚硫酸氢钠(Na HSO_3)复合引发体系引发丙烯酰胺(AM)单体聚合,合成了一种新型有机-无机杂化絮凝剂聚丙烯酰胺-聚合氯化铝铁(PAM-PAFC)。以产物的特性黏度(η)为依据,逐个探讨了聚合时间、聚合温度、引发剂质量分数和单体质量分数对特性黏度的影响。结果表明,在聚合时间为4 h、聚合温度为50℃、引发剂质量分数为0.5%以及单体质量分数为20%的时候,产物的特性黏度达到最大值513.78 m L·g^(-1),此条件即为杂化絮凝剂PAM-PAFC的最佳合成条件。电导率分析、红外光谱分析以及差热-热重分析都表明PAM-PAFC链端的—SO_4^(2-)与带正电荷的羟基铁、羟基铝粒子以离子键的形式相连接。扫描电镜分析表明杂化絮凝剂PAM-PAFC有着明显的空间网状结构。对高岭土-腐殖酸模拟水样的絮凝效果研究表明,达到相同的剩余浊度的条件下,需要投加的杂化絮凝剂PAM-PAFC的量远远低于复配絮凝剂PAM-PAFC。
A novel hybrid flocculant PAM-PAFC was synthesized by acrylamide monomer（AM） with a redox initiation system （NH4）2S2O8-NaHSO3. The effects of polymerization time, polymerization temperature, initiator mass fraction and monomer mass fraction on the intrinsic viscosity（η） of the products were individually investigated. The maximum intrinsic viscosity of 513.78 mL·g-1 was observed at the polymerization time of 4 h, the polymerization temperature of 50℃, the initiator mass fraction of 0.5% and the monomer mass fraction of 20%, which were the optimum synthesis parameters. The radical groups of sulfate at the end of the hybrid PAM-PAFC chain were joint with hydroxy aluminum or hydroxy ferrum particles by ionic bonds, and this was exhibited by conductivity test, FT-IR spectroscopy and TGA-DSC. The spatial network structure of the hybrid flocculant PAM-PAFC was also graphically present by SEM. The consumption of hybrid PAM-PAFC was much lower than that of composite PAM-PAFC in a flocculating test with kaolin-humic acid given the same residual turbidity.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第12期6301-6308,共8页
Chinese Journal of Environmental Engineering
基金
国家科技支撑计划项目(2012BAJ25B06-001)
关键词
聚合氯化铝铁
聚丙烯酰胺
有机-无机杂化
絮凝剂
polymeric aluminum ferric chloride
polyacrylamide
organic-inorganic hybrid
flocculant
