Size-controlled TiO2 nanoparticles on porous hosts for enhanced photocatalytic hydrogen production
Size-controlled TiO2 nanoparticles on porous hosts for enhanced photocatalytic hydrogen production
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DOI：
10.1016/j.apcata.2015.12.004
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发表时间：
2016-07-05
影响因子：
5.5
通讯作者：
Tang, Junwang
中科院分区：
文献类型：
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作者：
Jiang, Chaoran;Lee, Ki Yip;Tang, Junwang
通过溶胶-凝胶浸渍法在多孔基质（SBA-15 和 ZSM(-)15）上成功合成了纳米晶 TiO2 颗粒。通过 XRD、TEM、BET 表面分析、拉曼和紫外-可见漫反射光谱对所得纳米复合材料进行了表征，并评估了其 H-2 生产的光催化活性。 XRD 证明了锐钛矿纳米颗粒在 ZSM-5 和 SBA-15 多孔载体上的形成，而 TEM 则强调了颗粒尺寸对二氧化钛前体浓度的强烈依赖性。 TiO2/ZSM-(5) 和 TiO2/SBA-15 复合材料的光催化活性与纯 TiO2 相比显着增强，因为前者具有较小的 TiO2 粒径和较高的表面积。多孔载体上的 TiO2 负载和伴随的光催化制氢在光吸收、可用表面反应位点和粒径方面进行了优化。 10%TiO2/ZSM-5和20%TiO2/SBA-15被证明是最活跃的光催化剂，在全弧下表现出10,000和8800μmal g(TIO2)(-1) h(-1)的非凡析氢速率，在365 nm照射下分别具有12.6%和5.4%的高外量子效率。 (C) 2015 Elsevier B.V. 保留所有权利。
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.