可见光响应RGO/TiO_2复合材料制备及性能研究

Study on preparation of visible light response reduced graphene oxide/TiO_2 composite

以内蒙古兴和县天然石墨为前驱体,用改进的Hummers法制备氧化石墨烯(GO),并以硫酸钛[Ti(SO4)2]为钛源,采用水热法制备了系列还原氧化石墨烯(RGO)/二氧化钛(TiO_2)复合材料,采用XRD、SEM、FT-IR及UV-Vis等对样品进行测试,并以甲基橙溶液为目标污染物评价其可见光光催化性能。结果表明:制得的RGO/TiO_2复合材料中TiO_2均以锐钛矿型存在,颗粒尺寸7nm左右,光响应范围扩至可见区,具有较高的可见光光催化活性;当GO掺杂量为0.10g时制得的复合材料,在氙灯照射10min后对甲基橙的降解率可达88.41%,照射30min时的降解率可达到96%以上。

Graphene oxide（GO）was prepared from natural flake graphite by the modified Hummers method.The different amount of graphene oxide doped reduced graphene oxide/titanium dioxide（RGO/TiO2）photocatalysts were synthesized using titanic sulfate [Ti（SO4）2]and graphene oxide by a hydrothermal method.The morphology,structure and spectroscopy performance of prepared samples were characterized by X-ray powder diffraction（XRD）,scanning electron microscope（SEM）,infrared spectroscopy（FT-IR）and UV-Vis diffuse reflectance spectroscopy（UV-Vis）.In addition,the visible-light photocatalytic property of samples were investigated using methyl orange as a target pollutant.The results showed that after GO introduction,the band-gap of RGO/TiO2 was narrowed,the visiblelight absorption and photocatalytic activity were obviously improved.When the GO content was 0.1 g,the sample exhibited the highest photocatalytic degradation rate to methyl orange.Upon 10 min xenon lamp irradiation,the photodegradation rate of methyl orange reached 88.41%.After irradiation for 30 min,it can reached more than 96%.