核-壳结构PGMA@GO复合微球的制备及其对亚甲基蓝吸附性能研究

Synthesis of PGMA@GO composite microspheres with core-shell structure and their adsorption properties for methylene blue

通过酰胺反应成功制备了聚甲基丙烯酸缩水甘油酯-氧化石墨烯复合微球(PGMA@GO)。利用扫描电镜、透射电镜观察复合材料的形貌和粒径,并探究溶液初始pH值、吸附时间和溶液初始浓度等因素对PGMA@GO吸附亚甲基蓝(MB)性能的影响。结果表明,PGMA@GO为核-壳结构,粒径约为1.5μm,其对MB的最大吸附量为161.0mg·g^(-1),吸附过程符合准二级动力学方程,等温吸附曲线符合Langmuir方程,说明其吸附过程主要是以单分子层的化学吸附为主导。

Polyglycidyl methacrylate-graphene oxide composite microspheres(PGMA@GO)were successfully synthesized by amide reaction.The morphology and size of PGMA@GO composites were observed by SEM and TEM.The effects of initial pH,adsorption time and initial concentration on adsorption capacity of methylene blue(MB)were investigated.The results showed that the particle diameters of PGMA@GO microspheres were approximately 1.5μm with core-shell structure.The adsorption process was pseudo-second order and matched the Langmuir model with the maximum adsorption capacity of 161.0mg·g^(-1) for methylene blue(MB).This indicated that MB was adsorbed onto PGMA@GO mainly by chemical interactions via monolayer.