کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
596146 1454033 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and optical properties of mesoporous MCM-41 containing doped TiO2 nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Synthesis and optical properties of mesoporous MCM-41 containing doped TiO2 nanoparticles
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 339, Issues 1–3, 1 May 2009, Pages 111–117
نویسندگان
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