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首页> 外文期刊>RSC Advances >Photoreduction route for Cu2O/TiO2 nanotubes junction for enhanced photocatalytic activity
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Photoreduction route for Cu2O/TiO2 nanotubes junction for enhanced photocatalytic activity

机译：Cu2O / TiO2纳米管结的光还原途径以增强光催化活性

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Here, we synthesized copper( I ) oxide and titanium dioxide nanotubes (TNTs) heterojunctions (HJs) by a photoreduction method using a low-power UV lamp without involving any additional steps, such as chemical reduction, surfactant, or protection agents. Transmission electron microscopy, X-ray diffraction, Raman scattering, X-ray photoelectron spectroscopy, diffuse reflectance spectra, and photoluminescence spectroscopy were carried out to verify the formation of a HJ between the Cu _(2) O nanoparticles (Cu _(2) O NPs) and TNTs. The efficiency and the rate of methylene blue photo-degradation over the Cu _(2) O/TNTs HJ were found to be nearly double and triple compared to the isolated TNTs. The enhanced efficiency is attributed to the narrow band gap and defect states caused by the oxygen vacancies in the vicinity of HJs. Moreover, the type II band alignment of Cu _(2) O NPs and TNTs naturally separates the photo-generated carriers and constrains the recombination process owing to the internal electric field across the Cu _(2) O/TNTs interface.
机译：在这里，我们使用低功率紫外线灯通过光还原方法合成了氧化铜和二氧化钛纳米管异质结（HJs），而无需进行任何其他步骤，例如化学还原，表面活性剂或保护剂。进行了透射电子显微镜，X射线衍射，拉曼散射，X射线光电子能谱，漫反射光谱和光致发光光谱，以验证在Cu _（2）O纳米粒子（Cu _（2） O NP）和TNT。与分离的TNT相比，在Cu _（2）O / TNTs HJ上的亚甲基蓝光降解效率和速率几乎接近两倍和三倍。效率的提高归因于窄带隙和HJ附近氧空位引起的缺陷状态。此外，由于跨Cu _（2）O / TNTs界面的内部电场，Cu _（2）O NPs和TNT的II型能带排列自然分离了光生载流子，并限制了重组过程。

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