Back to Search Start Over

Size-controlled TiO2 nanoparticles on porous hosts for enhanced photocatalytic hydrogen production

Authors :
Chi Ching Lau
Junwang Tang
Adam F. Lee
Savio J. A. Moniz
Ki Yip Lee
Qiushi Ruan
Mustafa K. Bayazit
Christopher M. A. Parlett
Chaoran Jiang
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.

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