American Chemical Society
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Silvered TiO2 for Facet-Dependent Photocatalytic Denitrification

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journal contribution
posted on 2021-12-01, 18:39 authored by Ziming Shang, Xiaoqiang An, Huijuan Liu, Chengzhi Hu, Jiuhui Qu
In this paper, the influence of exposed facets of silvered TiO2 photocatalysts for photodenitrification was fundamentally investigated. We found that photodeposition of silver on 001-faceted TiO2 was prone to form Ag/Ag2O/001-TiO2 triple junctions. Comparatively, oxygen vacancies in 101-faceted TiO2 alleviated the oxidation rate, which contributed to the formation of a junctioned interface between TiO2 and metallic Ag0. Benefiting from the Z-scheme charge transfer pathway mediated by adjacent Ag, the nitrate reduction rate and N2 selectivity for Ag2O/Ag/101-TiO2 reached 99.1 and 81.1%, respectively, which were much higher than those of silvered 001-TiO2 and P25. In this work, we prepared TiO2-based photocatalysts with specific exposed crystal facets and good crystallinity at the heterogeneous interface for denitrification applications.