离子液体功能化微球的制备及其吸附性能的研究

Preparation of ionic liquid functionalized microspheres and their adsorption property

以N-乙烯基咪唑为共聚单体,聚(乙二醇)二甲基丙烯酸酯为交联剂,利用分散聚合法制备了粒径均匀的纳米微球(PEGDMA-Ⅵ),并通过表面改性制备了离子液体功能化纳米微球(PEGDMA-Ⅵ)@IL。采用SEM、FT-IR和XPS分别对微球形貌、结构、表面元素的化学组成和化学状态进行了表征。结果表明:(PEGDMA-Ⅵ)@IL纳米微球对L-苯丙氨酸(L-Phe)的吸附量为19.3mg/g,在短时间内即可达到吸附饱和。pH对微球吸附量的影响较显著,而且离子强度的增大也不利于微球对L-Phe的吸附。

Uniform microspheres （PEGDMA-VI） were prepared by dispersion polymerization using ethanol as sol- vent, N-vinylimidazole as monomer and polyethyleneglycol dimethacrylate as crosslinker,and then the ionic liquid function- alized microspheres （PEGDMA-VI）@IL were obtained after the surface modification of （PEGDMA-Ⅵ）. The morphology, structure, surface chemical composition and state of obtained microspheres were characterized by scanning electron micros- copy （SEM）,fourier-transform infrared （FT-IR） spectroscopy and X-ray photoelectron spectroscopy （XPS）. The adsorp- tion properties of microspheres for L-phenylalanine（L-Phe） were also investigated. The results indicated that the binding amount of microspheres for L-Phe reached 19.3mg/g and the microspheres showed fast adsorption rate which could reached the adsorption equilibrium in 80min. Moreover, the pH had great effect on the adsorption capacity and increasing of ionic concentration was not conducive to improving the adsorption of microspheres for L-Phe.