摘要
采用乳液插层水解法成功制备了一种层状磁响应性光催化纳米复合材料。首先通过水热法制备磁性Fe3O4纳米粒子,将其超声分散在溶有钛酸丁酯的无水乙醇中,形成钛酸丁酯包裹Fe3O4纳米粒子的微乳液,然后将该微乳液插层于石墨烯中,利用石墨烯的层状结构作为载体形成一种稳定体系,通过控制水解,使TiO2纳米粒子与磁性Fe3O4纳米粒子共同镶嵌于石墨烯层间,形成一种新型的磁响应TiO2/石墨烯纳米复合材料。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、震动样品磁强计(VSM)等手段对该复合材料进行表征,并通过模拟太阳光下降解亚甲基蓝(MB)评价复合材料的光催化性能。该复合材料通过磁分离可反复使用,重复使用7次后,对亚甲基蓝的降解率仍大于90%。
A new type of magnetic responsive TiO2/graphene nanocomposites with response to external optical and magnetic fields was prepared by using emulsion intercalation hydrolysis method. Magnetic Fe3O4 nanoparticles were synthesized by hydrothermal method and dispersed in ethanol containing tet- ra-n-butyl titanate through ultrasonic processing to establish a tetra-n-butyl titanate micro-emulsion wrapping Fe3O4 nanoparticles. Then, the micro-emulsion was intercalated into graphene layers by vig- orous stirring and a stable system was formed. Thereafter, the Fe3O4 and TiO2 nanoparticles were embedded into the layers of graphene through a controllable hydrolysis process. The morphology and structure of the samples were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）. The photocatalytic properties of the synthesized nanocomposites were evaluated by degrading methylene blue in simulated solar light. The magnetic responsive TiO2/graphene nanoeomposites exhibit excellent photocatalytic performance, and can be used repeatedly after the magnetic separation. The removal rate of methylene blue still maintains more than 90% even after repeated use for 7 times.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2015年第3期72-77,共6页
Journal of Materials Engineering
基金
国家自然科学基金项目(51262027)
甘肃省科技支撑计划项目(1104GKCA019)
甘肃省战略性新兴产业和产业技术研究与开发专项项目(甘发改高技[2012]1738)
甘肃省自然科学基金项目(1010RJZA023)
关键词
磁响应
TIO2
石墨烯
复合材料
光催化性能
magnetic response titanium dioxide
graphene
composite
photocatalytic performance
