Heterostructured BiOI@La(OH)3 nanorods with enhanced visible light photocatalytic NO removal

doi:10.1016/S1872-2067(17)62753-0

Abstract

Abstract:

Heterostructured BiOI@La(OH)₃ nanorod photocatalysts were prepared by a facile chemical impregnation method. The enhanced visible light absorption and charge carrier separation can be simultaneously realized after the introduction of BiOI particles into La(OH)₃ nanorods. The BiOI@La(OH)₃ composites were applied for visible light photocatalytic oxidization of NO in air and exhibited an enhanced activity compared with BiOI and pure La(OH)₃ nanorods. The results show that the energy levels between the La(OH)₃ and BiOI phases matched well with each other, thus forming a heterojunctioned BiOI@La(OH)₃ structure. This band structure matching could promote the separation and transfer of photoinduced electron-hole pairs at the interface, resulting in enhanced photocatalytic performance under visible light irradiation. The photocatalytic performance of BiOI@La(OH)₃ is shown to be dependent on the mass ratio of BiOI to La(OH)₃. The highest photocatalytic performance can be achieved when the mass ratio of BiOI to La(OH)₃ is controlled at 1.5. A further increase of the mass ratio of BiOI weakened the redox abilities of the photogenerated charge carriers. A new photocatalytic mechanism for BiOI@La(OH)₃ heterostructures is proposed, which is directly related to the efficient separation of photogenerated charge carriers by the heterojunction. Importantly, the as-prepared BiOI@La(OH)₃ heterostructures exhibited a high photochemical stability after multiple reaction runs. Our findings demonstrate that BiOI is an effective component for the formation of a heterostructure with the properties of a wide bandgap semiconductor, which is of great importance for extending the light absorption and photocatalytic activity of wide bandgap semiconductors into visible light region.

Key words: Bismuth oxyiodido@lanthanide hydroxide heterostructure, Nanorod, Photocatalysis, Visible light, Nitrogen oxide removal

Yanjuan Sun, Xiang Xiao, Xing'an Dong, Fan Dong, Wei Zhang. Heterostructured BiOI@La(OH)₃ nanorods with enhanced visible light photocatalytic NO removal[J]. Chinese Journal of Catalysis, 2017, 38(2): 217-226.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62753-0

https://www.cjcatal.com/EN/Y2017/V38/I2/217

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Heterostructured BiOI@La(OH)₃ nanorods with enhanced visible light photocatalytic NO removal

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