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首页> 外文期刊>Journal of Colloid and Interface Science >Sunlight mediated enhanced photocatalytic activity of TiO2 nanoparticles functionalized CuO-Cu2O nanorods for removal of methylene blue and oxytetracycline hydrochloride
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Sunlight mediated enhanced photocatalytic activity of TiO2 nanoparticles functionalized CuO-Cu2O nanorods for removal of methylene blue and oxytetracycline hydrochloride

机译：阳光介导的TiO2纳米颗粒的增强光催化活性官能化CuO-Cu2O纳米棒用于除去盐酸亚甲基蓝和氧氧杂环素

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Metal free heterojunctions have shown promising applicability as potential photocatalyst materials. Like the commonly explored metal-non metal heterojunctions, semiconductor-semiconductor junctions are also capable of facilitating charge separation and improved lifetimes, leading to augmented surface reaction efficacy. However, unlike the metal carrying heterojunctions, they are much economical and easier to fabricate and tune. Through this study, we present a facile one step hydrothermal route to synthesize CuO-Cu2O nanorods/TiO2 nanoparticles heterostructures (CTHS) with their potential application as a low cost photocatalytic alternative. The average size of the synthesized heterojunction components, as estimated from transmission electron microscopy (TEM) evaluation was 13 and 5 nm respectively for the nanorod length and width, while the functionalizing TiO2 nanoparticles were averaged around 10 nm. Heterojunction formation was confirmed using Raman spectroscopy, X-ray diffraction, high resolution TEM, and elemental mapping. X-ray photoelectron spectroscopy data marked with presence of Cu+ and Cu+2 state of CuO in CuxO-TiO2 also supported junction formation. Optical characteristics of the heterojunction were studied using UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. Compared to TiO2 nanoparticles, CTHS exhibited superior sunlight-induced photodegradation activity. CuxO-TiO2 heterojunction could also remediate toxic waste water containing model antibiotic residue (Oxytetracycline hydrochloride, 0.4 mg/mL) and organic pollutant (methylene blue, 10 mu M) in 20 and 60 min respectively. Ultra-fast degradation using a nonmetal heterojunction nanohybrid, like ours, finds negligible mention in literature. Improved visible light absorption and reduction in recombination rate for CuxO-TiO2 nanohybrids were ascribed as major contributing factors towards their enhanced photocatalytic potential. The charge separation mechanism for nanohybrids has been studied and elaborated in detail. (C) 2021 Elsevier Inc. All rights reserved.
机译：作为潜在的光催化材料，无金属异质结具有良好的应用前景。与通常探索的金属-非金属异质结一样，半导体-半导体结也能够促进电荷分离和延长寿命，从而提高表面反应效率。然而，与携带金属的异质结不同，它们更经济，更容易制造和调整。通过这项研究，我们提出了一种简便的一步水热法合成CuO-Cu2O纳米棒/TiO2纳米颗粒异质结构（CTH）的方法，并将其作为一种低成本的光催化替代物进行潜在的应用。根据透射电子显微镜（TEM）评估，合成的异质结组件的平均尺寸在纳米棒长度和宽度上分别为13和5 nm，而功能化TiO2纳米颗粒的平均尺寸约为10 nm。利用拉曼光谱、X射线衍射、高分辨率TEM和元素图谱证实了异质结的形成。以CuxO-TiO2中存在Cu+和CuO的Cu+2状态为标记的X射线光电子能谱数据也支持结的形成。利用紫外-可见漫反射光谱和光致发光光谱研究了异质结的光学特性。与TiO2纳米颗粒相比，CTHS表现出优越的阳光诱导光降解活性。CuxO-TiO2异质结还可以分别在20分钟和60分钟内修复含有模型抗生素残留（盐酸土霉素，0.4 mg/mL）和有机污染物（亚甲基蓝，10μM）的有毒废水。像我们这样使用非金属异质结纳米杂化材料的超快降解在文献中几乎没有提及。CuxO-TiO2纳米杂化物可见光吸收的改善和复合率的降低被认为是提高其光催化潜力的主要因素。对纳米杂化材料的电荷分离机理进行了详细的研究和阐述。（c）2021爱思唯尔公司保留所有权利。

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