氮掺杂TiO2/HTi2NbO7纳米片复合材料的制备及其可见光催化性能
Synthesis and Visible Light Photocatalytic Activity of Nitrogen-Doped TiO2/HTi2NbO7 Nanosheet Nanocomposite
作者单位E-mail
吕洪杰 江苏大学材料科学与工程学院, 镇江 212013
盐城工学院材料科学与工程学院, 盐城 224051 
 
高欣 江苏大学材料科学与工程学院, 镇江 212013
盐城工学院材料科学与工程学院, 盐城 224051 
 
孟承启 盐城工学院材料科学与工程学院, 盐城 224051
安徽理工大学材料科学与工程学院, 淮南 232001 
 
程婷 江苏大学材料科学与工程学院, 镇江 212013
盐城工学院材料科学与工程学院, 盐城 224051 
 
刘超 盐城工学院材料科学与工程学院, 盐城 224051 cliu@ycit.edu.cn 
陈小卫 盐城工学院材料科学与工程学院, 盐城 224051  
董鹏玉 江苏省新型环保重点实验室, 盐城工学院, 盐城 224051  
孟强强 江苏省新型环保重点实验室, 盐城工学院, 盐城 224051  
奚新国 盐城工学院化学化工学院, 盐城 224051 xi_xinguo@ycit.edu.cn 
摘要: 首先采用高温固相法制备层状前驱体CsTi2NbO7,通过与硝酸进行质子交换反应可得到层状HTi2NbO7,然后将HTi2NbO7分散在四丁基氢氧化铵(TBAOH)溶液中进行剥离反应,得到HTi2NbO7纳米片悬浮液,并进行冷冻干燥处理。以尿素为N源,将冷冻干燥的HTi2NbO7纳米片与TiO2前驱体(钛酸异丙酯)混合物进行高温焙烧处理,成功地合成了新型氮掺杂TiO2/HTi2NbO7纳米片(N-TTN)复合材料。采用扫描电子显微镜(SEM)、高倍透射电子显微镜(HRTEM)、X射线衍射(XRD)、N2吸附-脱附测试、X射线光电子能谱(XPS)、紫外可见吸收光谱(UV-Vis)及电化学测试等对材料的形貌、晶体结构、比表面积、孔分布和光吸收性能等进行表征与分析。研究发现锐钛矿型TiO2纳米颗粒均匀地分散在HTi2NbO7纳米片表面,在两组分间形成异质结结构。通过在可见光下降解有机污染物罗丹明B(RhB)来评价不同样品的光催化活性。结果表明,N-TTN复合材料具有最优的光催化降解活性,活性的增强主要归功于N元素的掺杂、异质结的构筑、增大的比表面积和丰富的介孔结构。
关键词: TiO2  HTi2NbO7纳米片  氮掺杂  复合材料  光催化性能
基金项目: 国家重点研发计划项目(No.2016YFC0209202),国家自然科学基金(No.21403184,51772258),住房和城乡建设部科学技术项目(No.2018-K1-004),江苏省自然科学基金(No.BK20160434),江苏省高校自然科学研究项目(No.14KJB150025,15KJA430007,14KJB430023),江苏省省级新型墙体材料专项基金(No.2016-14)和盐城市农业科技创新专项引导资金项目(No.YK2016031)资助
Abstract: The nitrogen-doped nanocomposite based on TiO2 nanoparticles and HTi2NbO7 nanosheets was success-fully synthesized by the following procedures:Layered CsTi2NbO7 was firstly prepared by high temperature solid-state method, and then treated with HNO3 solution to obtain layered HTi2NbO7 by proton-exchange reaction. The resulted layered HTi2NbO7 was well dispersed in tetrabutylammonium hydroxide (TBAOH) solution in order to prepare HTi2NbO7 nanosheets by exfoliation reaction and then freeze-dried treatment. Finally, to prepare nitrogen-doped TiO2/HTi2NbO7 nanosheets (denoted as N-TTN) nanocomposites, the mixtures of the freeze-dried HTi2NbO7 nanosheets and titanium(Ⅳ) isopropoxide were calcinated in the presence of urea as N source. The as-prepared samples were characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), photoelectrochemical properties measurements, UV-Vis spectroscopy as well as N2 adsorption-desorption measurements. It was found that anatase TiO2 nanoparticles were well-distributed on the surface of HTi2NbO7 nanosheets, resulting in the formation of heterojunction structure between two components. The photocatalytic activities of samples were evaluated by the photodegradation of rhodamine B (RhB) under visible light irradiation. It indicated that the resultant N-TTN nanocomposite showed a highest photocatalytic activity toward the degradation of RhB, owing to the synergistic effects of nitrogen doping, the formation of heterojunction, increased specific surface area and rich mesoporous structure.
Keywords: TiO2  HTi2NbO7 nanosheet  N-doped  composite  photocatalytic properties
投稿时间:2018-09-05 修订日期:2018-12-03
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吕洪杰,高欣,孟承启,程婷,刘超,陈小卫,董鹏玉,孟强强,奚新国.氮掺杂TiO2/HTi2NbO7纳米片复合材料的制备及其可见光催化性能[J].无机化学学报,2019,35(3):422-432.
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