化学学报 ›› 2000, Vol. 58 ›› Issue (11): 1403-1408. 上一篇    下一篇

研究论文

TiO~2修饰的介孔分子筛MCM-41的合成、表征及光 催化性研究

郑珊;高濂;张青红;郭景坤   

  1. 中国科学院上海硅酸盐研究所.上海(200050);中国科学院高性能结构陶瓷与超 微结构国家重点实验室
  • 出版日期:2000-11-15 发布日期:2000-11-15

Preparation, characterization and photocatalytic properties of titania modified monolayered mesoporous MCM-41

Zheng Shan;Gao Lian;Zhang Qinghong;Guo Jingkun   

  1. Shanghai Inst Ceram., CAS.Shanghai(200050)
  • Online:2000-11-15 Published:2000-11-15

首次以三种不同的含钛有机物为氧化钛的前驱体,合成了三种TiO~2呈单层分散状态的TiO~2修饰的介孔分子筛MCM-41,并以XRD,FT-IR,液氮温度下N~2吸附-脱附曲线,固体UV-vis漫反射等表征手段对其结构特征和氧化钛分散状态进行了研究。TiO~2在介孔分子筛MCM-41孔道中分散,MCM-41仍能保持骨架结构,没有晶相TiO~2生成;TiO~2与MCM-41孔道表面的≡Si-OH以化学键连接,生成Si-O-Ti键;TiO~2在MCM-41内孔壁呈均匀单层分散状态;TiO~2粒子的减小使其对紫外光的吸收发生明显的蓝移现象。并以苯酚降解反应为模型检验合成的具有光催化性的TiO~2修饰的MCM-41的光催化活性。

关键词: 二氧化钛, 分子筛, 光催化, X射线衍射分析, 付里叶变换, 红外分光光度法

The titania modified inner surface of mesoporous silicate MCM-41 was synthesized for the first time by varying titanium precursors and calcined MCM-41. The as-synthesized samples were characterized by XRD, FT-IR, nitrogen adsorption-desorption at 77K and solid state diffuse reflectance UV-vis spectroscopy. XRD suggested that a long-range order was still present in the hexagonal phase of the titania modified MCM-41 and were free of crystalline TiO~2. titania cocondensed with the pendant OH groups of MCM-41 via SI-O-Ti bonds and thus modified the inner walls. The titania in the modified MCM- 41 existed as a monolayer on the inner walls according to the results of nitrogen adsorption-desorption isotherms. In solid state UV-vis spectra, the titania modified MCM-41 had significant blue shift compared to bulk TiO~2 due to the well known quantum size effect. The photocatalytic properties of the titania modified MCM-41 were tested in the decomposition of phenol.

Key words: TITANIUM DIOXIDE, MOLECULAR SIEVE, PHOTOCATALYSIS, X- RAY DIFFRACTION ANALYSIS, FOURIER TRANSFORM, INFRARED SPECTROPHOTOMETRY

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