Visible light-response NaTa_{1鈭?span style='font-style: italic'>x}Cu_xO₃ photocatalysts for hydrogen production from methanol aqueous solution

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• 作者：Leilei Xu¹ ; Can Li¹ ; Weidong Shi ; Jianguo Guan ; ^{guanjg@whut.edu.cn} ; Zhigang Sun
• 关键词：Visible light ; NaTaO3 ; Doping ; Photocatalytic hydrogen production
• 刊名：Journal of Molecular Catalysis A ; Chemical
• 出版年：2012
• 期刊代码：57_13811169
• 类别：ch
• 出版时间：August, 2012
• 卷：360
• 期：Complete
• 页码：42-47
• 文件大小：892 K

摘要

Visible light-response NaTa_1鈭?em>xCu_xO₃ photocatalysts were prepared using a traditional solid-state reaction process, and well characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectrometer (EDX), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The photocatalytic activities were evaluated via photocatalytic hydrogen production in the methanol aqueous solution under visible light irradiation (位 > 400 nm). The doping of Cu(II) into NaTaO₃ lattice makes the characteristic step more obvious on the surface and leads to significant red shift of optical response towards visible light. The sample doped with 8%Cu(II) and loaded with 0.3 wt%NiO co-catalyst exhibited a dramatic increase of the activity without deactivation for 36 h in the hydrogen production reaction. The optimal loading of the co-catalyst is related to the surface textural properties of the composites. The enhanced visible light photocatalytic activity is mainly due to the donor level provided by the doped Cu(II) contributing to the valence band of the composite and the ordered nano-lamellar structure leading to more active sites for hydrogen production.