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

被引：61
作者：
Jiang, Chaoran [1 ]
Lee, Ki Yip [1 ]
Parlett, Christopher M. A. [2 ]
Bayazit, Mustafa K. [1 ]
Lau, Chi Ching [1 ]
Ruan, Qiushi [1 ]
Moniz, Savio J. A. [1 ]
Lee, Adam F. [2 ]
Tang, Junwang [1 ]
机构：
[1] UCL, Dept Chem Engn, Torrington Pl, London WC1E 7JE, England
[2] Aston Univ, European Bioenergy Res Inst, Birmingham B4 7ET, W Midlands, England
来源：
APPLIED CATALYSIS A-GENERAL | 2016年 / 521卷
基金：
英国工程与自然科学研究理事会;
关键词：
TiO2; ZSM-5; SBA-15; Porous supports; Photocatalysis; Hydrogen evolution; MESOPOROUS SILICA; PARTICLE-SIZE; WATER; OXIDATION; SBA-15; PERFORMANCE; EVOLUTION; TITANIUM; NANOCOMPOSITES; POSTSYNTHESIS;
D O I：
10.1016/j.apcata.2015.12.004
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页码：133 / 139
页数：7
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