悬浮聚合法制备罗丹明B磁性分子印迹微球及其性能

Properties of Rhodamine B' Magnetic Molecularly Imprinted Polymers Prepared from the Suspension Polymerization Method

以罗丹明B(RhB)为模板分子,采用悬浮聚合法制备了罗丹明B磁性印迹微球(M-MIPs),对其进行了结构表征,并与本体聚合的印迹材料进行了对比。结果表明,2种聚合物中的Fe3O4均呈现良好的晶形。悬浮法制得的M-MIPs呈球形,粒径在50μm左右,其饱和磁化强度(5.406 emu/g)比本体法制得的M-MIP(1.772 emu/g)更大,有利于快速磁性分离。悬浮法所得M-MIPs的吸附量是本体法所得M-MIPs吸附量的近1.8倍,且在吸附速率、选择性、重复使用性能等方面,均明显优于后者。2种材料均符合Langmuir吸附模型;悬浮法所得M-MIPs对RhB的吸附过程更符合二级动力学方程,而本体法所得M-MIPs较符合一级动力学方程。悬浮法制得的M-MIPs更适合于RhB的识别、富集与分析应用。

We used a suspension polymerization method to prepare magnetic molecularly imprinted polymers by using Rhodamine B as the template molecule. The obtained materials were characterized, and their properties were compared with those obtained from bulk polymerization. The results reveal that, F% O4 magnetic nanoparticles of the two kinds of polymers show good crystal morhpologies. The shape of M-MIPs prepared by suspension polymerization are regular with the microspheres size about 50 μm. Saturation magnetization of the M-MIPs （suspension polymerization ） is 5.406 emu/g, which is larger than that obtained from bulk polymerization（1. 772 emu/g）. In addition, the former is in favour of the fast magnetic separation than the latter. Compared with bulk polymerization, the adsorption of M-MIPs （ suspension polymerization） is 1.8 times higher. In terms of adsorption＇s capacity, selectivity and reusability, the results of M-MIPs （suspension polymerization） are superior to those of bulk polymerization. Two kinds of adsorbents follow the Langmuir adsorption model. The processes of suspension polymerization and bulk polymerization can be fitted to the second-order and first-order kinetics adsorption, respectively. Through comparative studies, the M-MIPs of suspension polymerization possess high selective adsorption properties to Rhodamine B molecules, which can be used in enrichment and analysis application.