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Photocatalytic Activity of N-doped TiO2 Photocatalysts Prepared from the Molecular Precursor (NH4)2TiO(C2O4)2
卜晶,方钧,石富城,姜志全,黄伟新*
作者单位E-mail
卜晶 中国科学技术大学合肥微尺度物质科学国家实验室中国科学院能量转换材料重点实验室化学物理系合肥230026  
方钧 中国科学技术大学合肥微尺度物质科学国家实验室中国科学院能量转换材料重点实验室化学物理系合肥230026  
石富城 中国科学技术大学合肥微尺度物质科学国家实验室中国科学院能量转换材料重点实验室化学物理系合肥230026  
姜志全 中国科学技术大学合肥微尺度物质科学国家实验室中国科学院能量转换材料重点实验室化学物理系合肥230026  
黄伟新* 中国科学技术大学合肥微尺度物质科学国家实验室中国科学院能量转换材料重点实验室化学物理系合肥230026 huangwx@ustc.edu.cn 
摘要:
用不同温度控制分解草酸氧钛铵制备N掺杂TiO2光催化剂.利用XRD、IR、热分析、N2吸-脱附等温线、XPS、紫外可见漫反射光谱和SEM表征了N-TiO2光催化剂的结构.400~600 oC焙烧的N-TiO2光催化剂为纯锐钛矿相,而700 oC焙烧的N-TiO2光催化剂为锐钛矿和金红石混合相.N掺杂在TiO2的间隙位使锐钛矿相TiO2带隙变窄.在光降解甲基橙的反应中,600和400 oC焙烧的N-TiO2催化剂分别在紫外光和全波长光照射下有最好活性;700 oC焙烧的N-TiO2催化剂无论在紫外光和全波长光下都表现出最好的比活性,即最高的光量子效率,这可以归因于700 oC焙烧的N-TiO2光催化剂良好的结晶程度和锐钛矿-金红石异相结的存在.
关键词:  N掺杂TiO2,草酸氧钛铵,光催化
DOI:10.1088/1674-0068/23/01/95-101
分类号:
基金项目:
Photocatalytic Activity of N-doped TiO2 Photocatalysts Prepared from the Molecular Precursor (NH4)2TiO(C2O4)2
Jing Bu,Jun Fang,Fu-cheng Shi,Zhi-quan Jiang,Wei-xin Huang*
Abstract:
We developed a novel approach for the preparation of N-doped TiO2 photocatalysts by calcining ammonium titanium oxalate at different temperatures. The structures of N-TiO2 were characterized by powder X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy, diffuse reflectance UV-Vis spectroscopy, and scanning electron microscope. The N-doped TiO2 photocatalysts calcined below 700 oC are the pure anatase phase but that calcined at 700 oC is a mixture of anatase and rutile phases. The doped N locates at the interstitial site of TiO2 which leads to the narrowing of bad gap of pure anatase N-TiO2. Among all photocatalysts, N-TiO2 photocatalysts calcined at 600 and 400 oC exhibit the best performance in the photodegradation of methyl orange under the UV light and all-wavelength light illuminations, respectively; however, because of the perfect crystallinity and the existence of anatase-rutile phase junctions, N-TiO2 photocatalyst calcined at 700 oC exhibits the highest specific photodegradation rate, i.e., the highest quantum yield, under both the UV light and all-wavelength light illuminations.
Key words:  N-doped TiO2, Ammonium titanyl oxalate, Photocatalysis