期刊
APPLIED CATALYSIS A-GENERAL
卷 521, 期 -, 页码 133-139出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2015.12.004
关键词
TiO2; ZSM-5; SBA-15; Porous supports; Photocatalysis; Hydrogen evolution
资金
- China Scholarship Counci (CSC) [201308060090]
- Leverhulme Trust [RPG-2012-582]
- EU FP7 [4G-PHOTOCAT 309636]
- Engineering and Physical Sciences Research Council [EP/K029525/1, EP/K021796/1, EP/K029525/2] Funding Source: researchfish
- EPSRC [EP/K029525/1, EP/K021796/1, EP/K029525/2] Funding Source: UKRI
Nanocystalline TiO2 particles were successfully synthesized on porous hosts (SBA-15 and ZSM(-)15) via a sol-gel impregnation method. Resulting nanocomposites were characterized by XRD, TEM, BET surface analysis, Raman and UV-vis diffuse reflectance spectroscopy, and their photocatalytic activity for H-2 production evaluated. XRD evidences the formation of anatase nanoparticles over both ZSM-5 and SBA-15 porous supports, with TEM highlighting a strong particle size dependence on titania precursor concentration. Photocatalytic activities of TiO2/ZSM-(5) and TiO2/SBA-15 composites were significantly enhanced compared to pure TiO2, owing to the smaller TiO2 particle size and higher surface area of the former. TiO2 loadings over the porous supports and concomitant photocatalytic hydrogen production were optimized with respect to light absorption, available surface reaction sites and particle size. 10%TiO2/ZSM-5 and 20%TiO2/SBA-15 proved the most active photocatalysts, exhibiting extraordinary hydrogen evolution rates of 10,000 and 8800 mu mal g(TIO2)(-1) h(-1) under full arc, associated with high external quantum efficiencies of 12.6% and 5.4% respectively under 365 nm irradiation. (C) 2015 Elsevier B.V. All rights reserved.
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