Enhanced Visible Light Photocatalytic Activity of Ag and Zn Doped and Codoped TiO2 Nanoparticles

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• 作者：Krishnakumar Varadharajan ; Boobas Singaram ; Rajaboopathi Mani…
• 刊名：Journal of Cluster Science
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：27
• 期：5
• 页码：1815-1829
• 全文大小：1,760 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry<br>Catalysis<br>Inorganic Chemistry<br>Physical Chemistry<br>
• 出版者：Springer Netherlands
• ISSN：1572-8862
• 卷排序：27

文摘

In the present study, this report discusses the preparation and photocatalytic properties of pure, Ag and Zn doped and Ag–Zn codoped TiOb>2b> nanoparticles by sol–gel method. The powder X-ray diffraction study showed that crystallite size of doped and codoped TiOb>2b> nanoparticles was decreased compared with pure TiOb>2b>. The decreased particles size was confirmed by high resolution transmission electron microscope and the particle size was in the range of 7–19 nm. The influence of codopant on the morphology of Ag–Zn codoped TiOb>2b> was clearly observed in the field electron scanning electron microscope. From the UV–Vis diffuse reflectance spectrum, it was observed that the doping and codoping of Ag and Zn reduce the energy gap of TiOb>2b>. The reduced emission intensity of doped and codoped TiOb>2b> in the photoluminescence spectrum suggests that the Ag and Zn lower the recombination of electron–hole pairs. The increase of Zn dopant level (0.2, 0.4 and 0.6 mol%) at 1 mol% of Ag in the codoped TiOb>2b> further reduces the emission intensity. The 0.6 mol% of Zn at 1 mol% of Ag in the codoped TiOb>2b> shows higher photocatalytic degradation ability against Reactive Yellow 145 under visible light compared with all other nanoparticles.KeywordsCodoped TiOb>2b>Optical propertiesMicrographsPhotocatalyst