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首页> 外文期刊>Catalysis science & technology >Novel one-step combustion synthesis of BiOBr: Yb3+, Er3+/AgBr upconversion heterojunction photocatalysts with enhanced vis/NIR photocatalytic activities
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Novel one-step combustion synthesis of BiOBr: Yb3+, Er3+/AgBr upconversion heterojunction photocatalysts with enhanced vis/NIR photocatalytic activities

机译：小说一步BiOBr燃烧合成:Yb3 + Er3 + / AgBr上转换异质结催化剂与增强可见光及近红外光谱光催化活性

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摘要

A simple combustion method was reported to prepare a novel BiOBr: Yb3+, Er3+/AgBr (BYE/AgBr) hetero-junction 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 (similar to 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.
机译：一个简单的燃烧方法报告准备异质结光催化剂。形态和样本的光学特性为特征。光致发光光谱显示as-synthesized再见/ AgBr可以被激活可见(vis)和近红外(NIR)光。值得注意的是,再见/ AgBr复合材料表现出增强的光催化活动RhB退化vis /近红外光谱辐照。再见/ AgBr-1常量:1.5 RhB是0.0220分钟(1)和0.01368 h(1)在可见光和近红外光谱辐照,2.6和4.9倍分别高于纯再见。上转换Er3 +可以把近红外光谱的影响光对可见光(类似于980海里)当时吸收再见/ AgBr产生e (-)和h(+)。增强的异质结中也扮演了重要的角色vis /近红外光谱光催化能力;相应的光催化机理提出了。

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