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Size-controlled TiO2 nanoparticles on porous hosts for enhanced photocatalytic hydrogen production
- Source :
- Applied Catalysis A: General. 521:133-139
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- 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 H2 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 8800μmolgTiO2 -1 h-1 under full arc, associated with high external quantum efficiencies of 12.6% and 5.4% respectively under 365nm irradiation.
- Subjects :
- Anatase
Nanocomposite
Diffuse reflectance infrared fourier transform
Chemistry
Process Chemistry and Technology
Nanoparticle
Nanotechnology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Catalysis
0104 chemical sciences
symbols.namesake
Chemical engineering
symbols
Photocatalysis
Particle size
0210 nano-technology
Raman spectroscopy
Hydrogen production
Subjects
Details
- ISSN :
- 0926860X
- Volume :
- 521
- Database :
- OpenAIRE
- Journal :
- Applied Catalysis A: General
- Accession number :
- edsair.doi...........f626ce84ad8c43927fa6957b13344844
- Full Text :
- https://doi.org/10.1016/j.apcata.2015.12.004