表面羧基化聚丙烯酸酯多孔微球的制备及其铜离子吸附性能研究

Preparation and adsorption properties of surface⁃functionalized polyacrylate porous beads for Cu^(2+)

以浓乳液作为悬浮聚合的油相,采用水(W)/油(O)/W浓乳液/悬浮聚合方法制备出了内部具有通孔结构、粒径均一的聚甲基丙烯酸叔丁酯多孔微球。结果表明,通过研究乳化剂含量、搅拌速度等参数对多孔微球的内部微孔形貌与微球粒径的影响,发现当乳化剂含量为4%时,得到的聚合物微球内的微孔结构分布均匀;而聚合物微球的平均粒径会随着搅拌速度的增大而减小。将不同粒径的多孔微球进行酸化水解后得到了表面羧基官能化的聚合物多孔微球,利用其丰富的通孔结构实现了对铜离子(Cu^(2+))的有效吸附,当微球平均粒径介于200~300μm时,铜离子的去除率最高,可达99.3%。

In this work,poly(tert‑butyl methacrylate)porous beads with an open‑hole structure and a uniform particle size were prepared through a W/O/W concentrated emulsion/suspension polymerization method using a concentrated emul‑sion as an oil phase for suspension polymerization.The effects of emulsifier content and stirring speed on the internal mi‑croporous morphology and particle size of the resultant porous beads were investigated.The results indicated that a uni‑form micropore distribution was obtained in the polymer beads at an emulsifier content of 4 wt%.The average particles size of the porous beads decreased with an increase in stirring speed.The beads with different particle sizes were treated through acidic hydrolyzation to obtain the surface‑functionalized porous beads with carboxyl groups.The functionalized beads achieved effective adsorption to copper ions(Cu^(2+))thanks to their multiporous structure.The functionalized beads with an average particle size between 200~300μm obtained a maximum removal rate of 99.3%for the absorption of copper ions.