导电石墨掺杂介孔二氧化钛复合体的制备及光催化性能

Preparation and photocatalytic properties of mesoporous titanium dioxide nanocomposites doped with conductive graphite

以十六烷基三甲基溴化铵(CTAB)为造孔模板,四氯化钛为钛源,无水乙醇为溶剂,采用水热合成法制备出导电石墨掺杂介孔二氧化钛纳米复合材料。利用热重-差热分析(TG-DTA)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)等分析手段表征了复合体的结构和形貌。并以紫外灯为光源,甲基橙为目标降解物,对复合体的光催化性能进行了评价。结果表明:CTAB与导电石墨的掺杂比显著影响复合体的性能;当二者的摩尔比为3∶1时,复合体的孔径最为规整、光催化性能最好;利用2.2 g/L该试样催化降解10 mg/L甲基橙溶液的效果最佳,降解率达到88.5%。

Conductive graphite-doped mesoporous titanium dioxide nanocomposites were prepared by hydrothermal method using cetyltrimethylammonium bromide(CTAB)as template,titanium tetrachloride as titanium source and anhydrous ethanol as solvent.The structure and morphology of the composites were characterized by thermogravimetric-differential thermal analysis(TG-DTA),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR)and scanning electron microscopy(SEM).The photocatalytic performance of the composite was evaluated by using methyl orange as the target degradation substance under UV light.The results showed that the doping ratio of CTAB and conductive graphite significantly affected the performance of the composite.When the molar ratio of CTAB and conductive graphite was 3∶1,the pore size of the complex was the most regular and the photocatalytic performance was the best.When 2.2 g/L of the sample was used to catalyze the degradation of 10 mg/L methyl orange solution,the degradation rate reached 88.5%.