Structure and photocatalytic properties of TiO_2-Graphene Oxide intercalated composite  

作　　者：ZHANG Qiong HE YunQiu CHEN XiaoGang HU DongHu LI LinJiang YIN Ting JI LingLi 

机构地区：[1]School of Materials Science and Engineering, Tongji University, Shanghai 200092, China

出　　处：《Chinese Science Bulletin》2011年第3期331-339,共9页

基　　金：supported by the National Natural Science Foundation of China (50672066)

摘　　要：TiO2-Graphene Oxide intercalated composite (TiO2-Graphene Oxide) has been successfully prepared at low temperature (80°C) with graphite oxide (GO) and titanium sulfate (Ti(SO4)2) as initial reactants.GO was firstly exfoliated by NaOH and formed single and multi-layered graphite oxide mixture which can be defined as graphene oxide,[TiO]2+ induced by the hydrolysis of Ti(SO4)2 diffused into graphene oxide interlayer by electrostatic attraction.The nucleation and growth of TiO2 crystallites took place at low temperature and TiO2-Graphene Oxide composite was successfully synthesized.Furthermore,the photocatalytic properties of TiO2-Graphene Oxide under the irradiation of UV light were also studied.The results show that the degradation rate of methyl orange is 1.16 mg min-1 g-1(refer to the efficiency of the initial 15 min).Compared with P25 powder,this kind of intercalation composite owns much better efficiency.On the other hand,the reusable properties and stable properties of TiO2-Graphene Oxide intercalated composite are also discussed in this paper.At last,crystalline structure,interface status,thermal properties and microscopic structure of TiO2-Graphene Oxide were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),thermogravimetric analysis (TGA),field emission scanning electron microscopy (FESEM) and high-resolution Transmission Electron Microscopy (HRTEM).Also,we have analyzed major influencing factors and mechanism of the composite structures which evidently improve the photocatalytic properties.TiO2-Graphene Oxide intercalated composite （TiO2-Graphene Oxide） has been successfully prepared at low temperature （80~C） with graphite oxide （GO） and titanium sulfate （Ti（SOa）2） as initial reactants. GO was firstly exfoliated by NaOH and formed sin- gle and multi-layered graphite oxide mixture which can be defined as graphene oxide, [TiO]2＋ induced by the hydrolysis of Ti（SO4）2 diffused into graphene oxide interlayer by electrostatic attraction. The nucleation and growth of TiO2 crystanites took place at low temperature and TiO2-Graphene Oxide composite was successfully synthesized. Furthermore, the photocatalytic properties of TiO2-Graphene Oxide under the irradiation of UV light were also studied. The results show that the degradation rate of methyl orange is 1.16 mg min^-1 g^-1（refer to the efficiency of the initial 15 rain）. Compared with P25 powder, this kind of inter- calation composite owns much better efficiency. On the other hand, the reusable properties and stable properties of TiO2-Graphene Oxide intercalated composite are also discussed in this paper. At last, crystalline structure, interface status, ther- mal properties and microscopic structure of TiO2-Graphene Oxide were characterized by X-ray diffraction （XRD）, X-ray photo- electron spectroscopy （XPS）, thermogravimetric analysis （TGA）, field emission scanning electron microscopy （FESEM） and high-resolution Transmission Electron Microscopy （HRTEM）. Also, we have analyzed major influencing factors and mechanism of the composite structures which evidently improve the photocatalytic properties.

关 键 词：光催化性能 复合氧化物 二氧化钛 石墨插层 晶体结构 高分辨透射电子显微镜 场发射扫描电子显微镜 Ti(SO4)2 

分 类 号：TQ134.11[化学工程—无机化工] O643.36[理学—物理化学]