TiO2插层氧化石墨烯降解亚甲基蓝性能研究

Photocatalytic performance of TiO2-intercalated graphene oxide toward methylene blue

采用改进的Hummers法制备氧化石墨烯,再利用钛酸丁酯原位水解制得TiO2插层氧化石墨烯。通过扫描电镜（SEM）、透射电镜（TEM）和X射线衍射（XRD）等表征手法对TiO2插层氧化石墨烯的形貌、结构进行表征分析;并通过降解亚甲基蓝试验评估了样品的光催化性能。XRD与TEM表征结果表明,氧化石墨烯氧化均匀,在超声状态下,酞酸丁酯可在氧化石墨烯片层间原位生成锐钛矿相的纳米级TiO2。降解试验结果表明：TiO2插层氧化石墨烯对亚甲基蓝有优异的光催化降解性能,所制备的TiO2插层氧化石墨烯重复降解亚甲基蓝4次,降解率依然可维持在99.97%,具有较高的重复使用性能。

Graphene oxide is prepared by the modified Hummers method and the TiO2-intercalaled graphene oxide （TiO2-GO） is prepared by in-situ formation. The morphology of TiO2-GO are characterized by scanning electron microscopy （ SEM ） , transmission electron microscopy （TEM） and X-ray diffraction （XRD） respectively. The photocatalytic degradation activity of TiO2-GO is studied. The resuhs of XRD and TEM show that GO is uniformly oxidized and anatase phase of nano-TiO2 could be generated among the GO sheets in situ by hydrolysis of butyl titauate under ultrasonic state. The results of photocatalytic activity show that TiO2-GO has an excellent photocatalytie degradation property toward methylene blue, the degradation of methylene blue is repeated four times by TiO2-GO anti the degradation rate could still be maintained at 99.97%, which proved that TiO2-GO has a high reuse performance.