Synthesis and optical properties of mesoporous MCM-41 containing doped TiO₂ nanoparticles

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• 作者：Huaming Yang ; Yuehua Deng ; Chunfang Du
• 关键词：Mesoporous MCM-41 ; TiO₂ ; Doping ; Nanocomposites ; Optical properties
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2009
• 出版时间：1 May 2009
• 年：2009
• 卷：339
• 期：1-3
• 页码：111-117
• 全文大小：873 K

文摘

Nanosized TiO₂ is a kind of high-performance and functional inorganic material, the widespread use of TiO₂ is impaired by some defects of its structure, wide band gap (3.2 eV), and agglomeration easily occurred during the synthesis process. Uniform ordered channels of mesoporous materials, such as MCM-41, can control the particle size of TiO₂ and efficiently prevent particles from agglomeration. Tetraethylorthosilicate (TEOS) and tetrabutyl titanate were used as the silica source and Ti source respectively to synthesize the TiO₂/MCM-41 (TM) doped with different ions. MCM-41 was synthesized using a hydrothermal route; metal ions were incorporated into the pore channels of MCM-41 via a sol–gel method. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), ultraviolet–visible (UV–vis) spectrophotometry, N₂ adsorption–desorption measurements and X-ray photoelectron spectroscopy (XPS) confirmed the incorporation of TiO₂ nanoparticles inside the pores of the mesoporous MCM-41 host without destroying its integrity. Specific surface area of TM composites increased, but the pore size and the pore volume decreased compared with that of pure MCM-41. The UV–vis spectra demonstrate that all the absorbance peaks of TM composites have a blue shift. The absorbance peaks of TM composites doped with different metal ions shift again. Ce-doped TM shows red shift markedly, which provides the possibility for preparing visible-light reactive photocatalyst.