CAJ | 학술논문

采用氧化石墨(GO)和硫酸钛作为初始反应物,在低温下(80℃)制备了纳米级的氧化钛.氧化石墨插层(TiO_2-GO)复合材料,研究了这一复合材料的紫外光催化性能.结果表明,在采用TiO_2-GO插层复合材料对甲基橙溶液进行紫外光催化降解时,其降解效率η=1.17 mg·min~(-1)·g~(-1),明显优于德固赛P25氧化钛粉.通过对TiO_2-GO插层复合材料进行x射线衍射(XRD)、傅里叶红外(FT-IR)光谱、X射线光电子能谱(XPS)和场发射扫描电子显微镜(FESEM)等测试,表征了产物的晶相结构、界面状况及其显微结构.结果表明:插层结构中的TiO_2晶粒为锐钛矿和金红石的混合相,且锐钛矿相含量大于金红石相含最;氧化石墨层间的含氧基团如C=O,基本被还原.对TiO_2-GO插层复合材料的形成机理以及该材料具有优越光催化性能的原因进行了探讨.
채용양화석묵(GO)화류산태작위초시반응물,재저온하(80℃)제비료납미급적양화태.양화석묵삽층(TiO_2-GO)복합재료,연구료저일복합재료적자외광최화성능.결과표명,재채용TiO_2-GO삽층복합재료대갑기등용액진행자외광최화강해시,기강해효솔η=1.17 mg·min~(-1)·g~(-1),명현우우덕고새P25양화태분.통과대TiO_2-GO삽층복합재료진행x사선연사(XRD)、부리협홍외(FT-IR)광보、X사선광전자능보(XPS)화장발사소묘전자현미경(FESEM)등측시,표정료산물적정상결구、계면상황급기현미결구.결과표명:삽층결구중적TiO_2정립위예태광화금홍석적혼합상,차예태광상함량대우금홍석상함최;양화석묵층간적함양기단여C=O,기본피환원.대TiO_2-GO삽층복합재료적형성궤리이급해재료구유우월광최화성능적원인진행료탐토.
TiO_2-graphite oxide (TiO_2-GO) composites were successfully prepared at low temperature (80 CC) using graphite oxide (GO) and titanium sulfate (Ti(SO_4)_2) as initial reactants. The photocatalytic properties of TiO_2-GO under UV light irradiation were also studied. Results show that the degradation rate of methyl orange is 1.17 mg·min~(-1)·g~(-1) (referring to the efficiency of the initial 15 min). Compared with Degussa P25 powders, this intercalation composite is far more efficiently. In addition, the crystalline structure, interface status and microscopic structure of TiO_2-GO were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FESEM). Result showed that the TiO_2 crystallites in the intercalated structure were composed of anatase and rutile phase with the former phase being enriched. The functional groups present in GO such as carboxyl (C=O) were mostly reduced in the intercalation composite. On the other hand, the synthesis mechanism and the main reasons responsible for the superior photocatalytic properties of TiO_2-GO are also discussed.