原位聚合法制备纳米核-壳型PS-CHO@RGO复合微球及其催化活化过硫酸氢钾降解亚甲基蓝  

Preparation of nano core-shell PS-CHO@RGO composite microspheres by in-situ polymerization as a potassium hydrogen persulfate catalytic activator for methylene blue degradation

作　　者：倪镜博 刘如一 张明[1] 严长浩[1] NI Jingbo;LIU Ruyi;ZHANG Ming;YAN Changhao(College of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225000,China)

机构地区：[1]扬州大学化学化工学院,扬州225000

出　　处：《复合材料学报》2021年第7期2132-2139,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51273172);江苏省研究生创新计划(SJCX19_0886)。

摘　　要：还原氧化石墨烯(RGO)具有比表面积大、电子传输效率高、吸附速率快等优点,在处理油污、重金属离子、有机染料等领域均有应用,但由于自团聚而造成的分散性差等问题限制了其进一步应用。采用原位聚合法制备纳米核-壳型聚苯乙烯醛基微球(PS-CHO)@RGO复合微球。利用TEM、Raman、XRD、XPS及绝缘电阻测试仪对PS-CHO@RGO复合微球的形貌及理化性能进行表征。以亚甲基蓝(MB)为目标污染物,探究了PS-CHO@RGO复合微球在少量过硫酸氢钾(PMPS)存在下的氧化活性,并提出了降解机制。结果表明,RGO片层均匀包覆于PS-CHO微球表面,有效改善了分散性。制备所得PS-CHO@RGO复合微球的渗透阈值低,导电网络完善。降解实验中,PS-CHO@RGO复合微球可以激发PMPS生成硫酸根自由基(SO_(4)^(−)·),MB的氧化降解率显著提高,60 min内可达98%以上。PS-CHO@RGO复合微球同时表现出良好的稳定性,通过高速离心的方式实现循环利用。The reduced graphene oxide(RGO)has been widely used in the treatment of oil,heavy metal ions,organic dyes and other fields due to the large specific surface area,high electron transport efficiency and fast adsorption rate.However,the poor dispersion caused by agglomeration limited the further research.In-situ polymerization was used to prepare nano core-shell polystyrene aldehyde microspheres(PS-CHO)@RGO composite microspheres.The morphology and physicochemical properties of the PS-CHO@RGO composite microspheres were characterized by TEM,Raman,XRD,XPS and insulation resistance tester.The methylene blue(MB)was selected as the target pollutant,the oxidation activity of PS-CHO@RGO composite microspheres in the presence of potassium hydrogen persulfate(PMPS)was investigated,and the degradation mechanism was proposed.The results indicate that RGO layer is uniformly coated on the surface of PS-CHO microspheres,which effectively improved the dispersion.The prepared PS-CHO@RGO composite microspheres are described as low penetration threshold and perfect conductive network.In the degradation experiment,PS-CHO@RGO composite microspheres can stimulate PMPS to generate sulfate radicals(SO_(4)^(−)·),over 98%of MB is catalytically degraded within 60 minutes.Meanwhile,the PSCHO@RGO composite microspheres also show good stability and can be recycled by high-speed centrifugation.

关 键 词：复合微球 还原氧化石墨烯(RGO) 核-壳型 亚甲基蓝 催化 降解 

分 类 号：TB332[一般工业技术—材料科学与工程]