反相悬浮聚合法制备阳离子性CPDAC凝胶微球及其对水污染化合物的吸附性能

Preparation of Cationic CPDAC Gel Microspheres via Inverse Suspension Polymerization and Their Adsorption Characteristics to Toxic Anion Species

以环已烷为分散介质、Span-60为分散剂,采用反相悬浮聚合法,通过阳离子单体丙烯酰氧乙基三甲基氯化铵(DAC)的交联聚合(CP),制备了粒径200～300μm的凝胶微球CPDAC,考察了主要条件对微球成球性能及粒径的影响,对微球进行了表征,研究了CPDAC对4种阴离子物质的吸附特性.结果表明,制备CPDAC需严格控制成球条件.分散相水相采用滴加方式,适宜的分散剂为Span-60,随其用量增加微球粒径变小;油水相体积比小于2:1不能成球,随体积比增大,微球粒径减小;搅拌速率小于250 r/min不能成球,微球粒径随搅拌速率加快而变小.CPDAC凭借强离子交换作用及静电相互作用对CrO42-,MoO42-和酸性染料活性艳红、活性黄4种阴离子物质都有很强的吸附作用,吸附容量分别为213,275,1850和1690 mg/g,吸附容量随温度升高而降低.

The crosslinking copolymerization （CP） of acryloxyethyltrimethyl ammonium chloride （DAC） and N,N＇-methylene bisacrylamide （MBA） was performed via inverse suspension polymerization method, and 200-300 μm CPDAC gel microspheres were prepared with cyclohexane as dispersion medium and Span-60 as dispersant. The effects of main factors on the balling performance and grain diameter of CPDAC were examined, and CPDAC characterized. The adsorption （anion exchange） characteristics of CPDAC were studied. The results show that in order to prepare CPDAC, the dispersion phase （water） must be added in the manner of dropwise adding, Span-60 is a suitable dispersant, and the grain diameter of CPDAC decreases with increasing of the amount of Span-60. The volume ratio of oil phase to water phase can not be smaller than 2：1, the grain diameter of CPDAC decreases with increasing of the volume ratio. The agitating rate can not be below 250 r/min, the grain diameter decreases with increasing of the rate. Through the strong ion exchange action and electrostatic interaction, CPDAC possess strong adsorption to four anionic species, CrO42-, MoO42- and acidic dyes Reactive Brilliant Red and Reactive Yellow, with the adsorption capacities of 213, 275, 1 850 and 1690 mg/g, respectively. The adsorption capacity decreases with increasing of temperature.