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首页> 外文期刊>Thin Solid Films >Photocatalytic degradation of selected dyes by titania thin films with various nanostructures
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Photocatalytic degradation of selected dyes by titania thin films with various nanostructures

机译：具有各种纳米结构的二氧化钛薄膜对所选染料的光催化降解

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摘要

Titania thin films with various nanostructures of quasi-aligned nanorods, well-aligned nanotubes and nanoparticle aggregates were fabricated and utilized to assist photodegradation of three typical dye derivatives in water, i. e., rhodamine B (RB), methylene blue (MB) and methyl orange (MO). The thin films were characterized by X-ray diffraction, scanning electron microscope and UV-Vis diffuse reflectance spectra. It is found that the bandgap of most lab-fabricated thin films can be estimated more appropriately assuming a direct transition between the valance band and the conduction band of titania. The so-called natural ageing phenomenon was evidence for all the films to assist photodegradation of RB and MB in water; but not discernible for MO, which was much reluctant to photodegradation. MB decomposed much quickly than RB when assisted by titania with predominantly anatase; on the other hand, rutile favored the photodegradation of RB than that of MB. Titania thin films with top morphologies of quasi-aligned nanorods or nanotubes were found to possess advantageous turnover frequency and photonic efficiency over commercial P25 titania and sol-gel derived titania to assist photodegradation of RB and MB in water.
机译：制备了具有准排列的纳米棒，排列良好的纳米管和纳米粒子聚集体的各种纳米结构的二氧化钛薄膜，并用于辅助水中三种典型染料衍生物的光降解。例如罗丹明B（RB），亚甲基蓝（MB）和甲基橙（MO）。通过X射线衍射，扫描电子显微镜和UV-Vis漫反射光谱对薄膜进行表征。已经发现，假设二氧化钛的价带和导带之间存在直接过渡，则可以更适当地估计大多数实验室制造的薄膜的带隙。所谓的自然老化现象是所有薄膜有助于水中RB和MB光降解的证据。但对于MO而言却无法辨别，因为MO不太愿意进行光降解。当二氧化钛与锐钛矿相结合时，MB的分解速度比RB快。另一方面，金红石更倾向于RB的光降解而不是MB。发现具有顶部形态准对准的纳米棒或纳米管的二氧化钛薄膜具有比商业P25二氧化钛和溶胶-凝胶衍生的二氧化钛更有利的周转频率和光子效率，从而有助于水中的RB和MB的光降解。

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