Hydrogen production from water splitting under UV light irradiation over Ag-loaded mesoporous-assembled TiO2–ZrO2 mixed oxide nanocrystal photocatalysts
Hydrogen production from water splitting under UV light irradiation over Ag-loaded mesoporous-assembled TiO2–ZrO2 mixed oxide nanocrystal photocatalysts
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DOI：
10.1016/j.ijhydene.2011.01.176
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发表时间：
2011-05
影响因子：
7.2
通讯作者：
Surakerk Onsuratoom;S. Chavadej;T. Sreethawong
中科院分区：
文献类型：
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作者：
Surakerk Onsuratoom;S. Chavadej;T. Sreethawong
由光催化水裂解反应产生氢气是非常有吸引力的，因为它是环境友好的方法，其中氢气是在光催化剂的帮助下从两种丰富的可再生资源即水和太阳能产生的。TiO 2是研究最广泛的光催化剂;然而，单独使用它仍然表现出较低的光催化制氢性能。因此，本研究的目的是研究载银介孔组装TiO 2-ZrO 2复合氧化物光催化剂在紫外光照射下的光催化产氢性能.采用溶胶-凝胶法在结构导向表面活性剂的辅助下合成了不同TiO 2/ZrO 2摩尔比的TiO 2-ZrO 2复合氧化物，然后通过光化学沉积法负载Ag。研究了焙烧温度、相组成和载银量等制备工艺参数对催化剂性能的影响。结果表明，500 °C焙烧的TiO 2：ZrO 2摩尔比为93：7的介孔组装TiO 2-ZrO 2复合氧化物光催化剂具有最高的光催化产氢活性，Ag负载量为0.5wt.%进一步提高了该TiO 2-ZrO 2复合氧化物光催化剂的光催化活性。
Hydrogen production from the photocatalytic water splitting reaction is very attractive because it is an environmentally friendly process, where hydrogen is produced from two abundantly renewable sources, i.e. water and solar energy, with the aid of photocatalysts. TiO2is the most widely investigated photocatalyst; however, it alone still exhibits low performance to photocatalytically produce hydrogen. Hence, the aim of this work focused on the enhanced photocatalytic hydrogen production over Ag-loaded mesoporous-assembled TiO2–ZrO2mixed oxide nanocrystal photocatalysts under UV light irradiation. The TiO2–ZrO2mixed oxides with various TiO2-to-ZrO2molar ratios were synthesized by a sol–gel process with the aid of a structure-directing surfactant, followed by Ag loading via a photochemical deposition method. The influences of photocatalyst preparation parameters, i.e. calcination temperature, phase composition, and Ag loading, were studied. The results revealed that the mesoporous-assembled TiO2–ZrO2mixed oxide nanocrystal photocatalyst with a TiO2-to-ZrO2molar ratio of 93:7 calcined at 500 °C exhibited the highest photocatalytic hydrogen production activity, and the Ag loading of 0.5 wt.% further greatly enhanced the photocatalytic activity of such TiO2–ZrO2mixed oxide photocatalyst.