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首页> 外文期刊>Catalysis science & technology >Enhanced photocatalytic degradation of tetracycline by constructing a controllable Cu2O-TiO2 heterojunction with specific crystal facets
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Enhanced photocatalytic degradation of tetracycline by constructing a controllable Cu2O-TiO2 heterojunction with specific crystal facets

机译：增强的光催化降解四环素通过构造一个可控的Cu2O-TiO2异质结具有特定晶体方面

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摘要

A heterojunction photocatalytic system has been widely called for to solve tetracycline (TC) water pollution problems. However, the pollutant degradation mechanism with a Z-scheme or double-charge transfer photocatalyst has remained ambiguous. In this work, we successfully constructed a controllable heterojunction between TiO2 and Cu2O by adjusting the exposed facets of Cu2O without additional surfactant. XPS, FT-IR, EIS, PL, EPR, LC-MS, photocurrent curves and scavenger experiments, as well as XRD characterization before and after photocatalysis, demonstrate that the heterojunction with double-charge transfer mechanism exists between TiO2 and cubic Cu2O exposed {100} facets (100Cu(2)O), where electrons diverted from 100Cu(2)O to TiO2 by O atoms to enhance the TC photocatalytic degradation rate. However, the complete decomposition of TC intermediate products was attenuated as the TC degradation reaction was drifted on the more positive conduction band of TiO2. Instead, Z-scheme heterojunction between TiO2 and octahedral Cu2O exposed {111} facets, (111Cu(2)O) was formed where electrons moved from the conduction band of TiO2 to the valence band of 111Cu(2)O by Cu atoms. Thereby, TC degradation occurred at the conduction band of 111Cu(2)O, which enhanced the TC photo-degradation rate and the profound decomposition of TC intermediate simultaneously. We expect that this work can contribute to the prospective application of heterojunction for the photocatalytic degradation of antibiotics.
机译：异质结光催化体系广泛呼吁解决四环素(TC)水污染问题。Z-scheme或退化机制两步转移光催化剂仍然模糊。构建了一个可控的异质结二氧化钛和Cu2O暴露方面的调整Cu2O没有额外的表面活性剂。EIS、PL EPR,质光电流曲线和食腐动物实验,以及x射线衍射表征光催化作用前后,证明的异质结两步转移机制之间存在二氧化钛和立方Cu2O暴露的{100}面(100立方(2)O),电子转移100铜(2)O O原子提高TC二氧化钛光催化降解率。完整的TC中间分解产品被减为TC退化在更积极的反应是漂流二氧化钛的导带。异质结二氧化钛和八面体Cu2O之间暴露的{111}面(111立方(2)O)成立电子从导带在哪里二氧化钛111立方的价带(2)O的铜原子。111立方的导带(2)O,这增强了TC;降解率和深远的同时分解TC中间。我们预计,这项工作可以做出贡献异质结的潜在应用光催化降解抗生素。

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