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Novel one-step combustion synthesis of BiOBr:Yb3+,Er3+/AgBr upconversion heterojunction photocatalysts with enhanced vis/NIR photocatalytic activities

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Abstract

A simple combustion method was reported to prepare a novel BiOBr:Yb3+,Er3+/AgBr (BYE/AgBr) heterojunction photocatalyst. Phase composition, morphology and optical properties of samples were characterized. The diffuse reflectance and photoluminescence spectra showed that the as-synthesized BYE/AgBr can be activated under both visible (vis) and near-infrared (NIR) light. Notably, BYE/AgBr composites exhibited enhanced photocatalytic activity for RhB degradation under vis/NIR irradiation. The degradation rate constants of BYE/AgBr-1 : 1.5 for RhB were 0.0220 min−1 and 0.01368 h−1 under visible and NIR irradiation, which are about 2.6 and 4.9 times higher than that of pure BYE, respectively. The upconversion effect of Er3+ can convert the NIR light (∼980 nm) to visible light which was then absorbed by BYE/AgBr to generate e and h+. Moreover, the formation of the heterojunction also plays a role in the enhanced vis/NIR photocatalytic abilities; and a corresponding plausible photocatalytic mechanism was proposed.

Graphical abstract: Novel one-step combustion synthesis of BiOBr:Yb3+,Er3+/AgBr upconversion heterojunction photocatalysts with enhanced vis/NIR photocatalytic activities

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Publication details

The article was received on 23 Oct 2018, accepted on 21 Mar 2019 and first published on 21 Mar 2019


Article type: Paper
DOI: 10.1039/C8CY02187B
Citation: Catal. Sci. Technol., 2019, Advance Article

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    Novel one-step combustion synthesis of BiOBr:Yb3+,Er3+/AgBr upconversion heterojunction photocatalysts with enhanced vis/NIR photocatalytic activities

    S. Liang, Y. Chang, Y. Wang, D. Zhang and X. Pu, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C8CY02187B

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