响应面法优化制备PAC-PDMDAAC杂化絮凝剂及其表征  

Preparation of PAC-PDMDAAC hybrid flocculant by response surface method and its characterization

作　　者：蒋绍阶[1] 冯欣蕊 李晓恩[1] 蒋世龙[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《化工学报》2014年第2期731-736,共6页CIESC Journal

基　　金：村镇饮用水安全保障重大科技工程项目(2012BAJ 25B06-001);国家水体污染控制与治理科技重大专项项目(2009ZX 07424-004)~~

摘　　要：以硅烷偶联剂KH570为改性剂,以过硫酸铵为引发剂,合成了聚合氯化铝-聚二甲基二烯丙基氯化铵(PAC-PDMDAAC)杂化絮凝剂。采用响应面分析法通过建立特征黏度与各因素之间的Box-Behnken数学模型,对杂化PAC-PDMDAAC的制备工艺进行优化,最优制备条件为:DMDAAC质量分数为33%,引发剂质量分数为0.6%,反应温度为64℃,反应时间为3 h。电导测试、傅里叶红外光谱(FT-IR)及热重分析(TGA)结果表明PAC-PDMDAAC杂化产物的有机-无机组分间以共价键形式键合,性质稳定;扫描电镜(SEM)照片显示其结构疏松,粒度较大,更易发挥吸附架桥作用。Polyaluminum chloride （PAC）-poly（dimethyl diallyl ammonium chloride） （PDMDAAC）, a new type of organic-inorganic hybrid flocculant, was prepared by using KH570 as modifying agent and ammonium persulfate as initiator. The Box-Behnken mathematical relational model between intrinsic viscosity and affecting factors was established, and the technology of preparing PAC-PDMDAAC was optimized. The optimum preparation conditions were： DMDAAC mass fraction 33%, initiator mass fraction 0.6%, reaction temperature 64℃ and reaction time 3 h. Conductivity measurement, FT-IR and TGA showed covalent bond between PAC and PDMDAAC. SEM photos revealed that the PAC-PDMDAAC hybrid flocculant had loose structure and large particle size, which made it easier to play bridging and adsorption roles.

关 键 词：混凝 制备 优化 响应曲面法 有机-无机杂化 

分 类 号：TU991.22[建筑科学—市政工程]