摘要
首次以有机物钛酸丁酯为前驱体，合成了ＴｉＯ２呈单层分散状态（Ｔｉ／Ｓｉ＝０.２０）或双层分散状态（Ｔｉ／Ｓｉ＝０．３９）的介孔分子筛ＭＣＭ－４１（Ｓｉ／Ａｌ＝３５），并以 ＸＲＤ，ＦＴＩＲ，Ｎ２吸附－脱附，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．结果表明： ＴｉＯ２在介孔分子筛ＭＣＭ－４１孔道中分散， ＭＣＭ－４１骨架结构结晶度降低，但是附着二层ＴｉＯ２后，仍能保持长程有序结构； ＴｉＯ２与ＭＣＭ－４１孔道表面的ＳｉＯ２以化学键连接，生成Ｓｉ－Ｏ—Ｔｉ键；无论是单层还是双层分散的 ＴｉＯ２在 ＭＣＭ－４１内孔壁均匀分散；且由于ＴｉＯ２粒子的减小使其对紫外光的吸收发生明显的蓝移现象．
Two kinds of titania modified the inner surface of mesoporous slilcate MCM-41 (MCMTiO2 and MCM-Ti-TiO2) were synthesized by precursor tetrabutyltitanate and calcined MCM-41. The samples were characterized by XRD, FTIR, nitrogen adsorption/desorption at 77K and solid state diffuse reflectance UV-vis spectroscopy. XRD suggested that a long-range a long-range order kept in the hexagonal phase of titania modified MCM-41. Tetrabutyltitanate cocondensation with the pendant OH groups of MCM-41 via Si-O-Ti bonds and titania modified the inner walls of MCM-41. Titania on the inner walls of modified MCM-41 was estimated monolayer or two-layer according to the results of nitrogen adsorption/desorption isotherms. In UV-vis spectra, titania modified MCM-41 had significant blue shift compared to bulk TiO2 which is attributed to the well known quantum size effect for semiconductor as the particle size decreases.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第1期98-102,共5页
Journal of Inorganic Materials
关键词
介孔分子筛
MCM-41
分散
二氧化钛
mesoporous molecular sieve
MCM-41
TiO2
titania-modified MCM-41
