丙烯酸表面修饰聚丙烯滤芯棉的制备和吸附性能

Preparation and Adsorption Behaviors for Cd^(2+) of Surface-modified Polypropylene Cotton with Acrylic Acid

采用紫外光接枝法,以丙烯酸(AA)为功能单体,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,在聚丙烯(PP)滤芯棉表面进行交联接枝共聚,制备出交联接枝率为220%的丙烯酸表面修饰PP棉。用红外光谱对交联接枝共聚物的结构进行了表征。其最佳工艺条件为引发剂二苯甲酮(BP)用量为0.50 g/100gAA,MBA用量为5.0 g/100 gAA,AA与PP质量比为5:1,光照时间为25 min。采用平衡吸附法研究了丙烯酸表面修饰PP棉对重金属Cd^-(2+)的吸附性能。结果表明,当Cd^(2+)初始质量浓度低于50 mg·L^(-1)时,丙烯酸修饰PP棉对Cd^(2-)的吸附率可达到95%以上。在研究的浓度范围内,丙烯酸修饰PP棉对Cd^(2+)的吸附不符合Langmuir和Freundlich模型。

Surface-modified polypropylene （PP） cotton with acrylic acid （AA） was prepared by cross-linked grafting copolymerization of AA onto PP filter cotton, using AA as a functional monomer and N, N＇-Methylenebisacrylamide （MBA） as a cross-linked agent in the present of UV light, and the cross-linked grafting ratio of PP cotton can reach 220%. The optimum process conditions is： benzophe- none （BP） content 0.50 g/100 g AA, MBA content 5.0 g/100 g AA, the mass ratio of AA to PP 5 ： 1, and the irradiation time 25 min. The structure of surface-modified PP cotton with AA was characterized with FT-IR. The adsorption behaviors for Cd2＋ were investigated. The experimental results show that sur- face-modified PP cotton with AA has a good adsorption capacity and the adsorption ratio reached above 95% when Cd2＋ concentration was less than 50 mg . L-1. The adsorption equilibrium data of Cd2. do not obey Langmuir model and Freundlich model in the investigated concentration range.