Effect of the morphology of V₂O₅/TiO₂ nanoheterostructures on the visible light photocatalytic activity

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• 作者：Qing Su ; Jiawang Zhang ; Yuan Wang ; Minglang Yu ; Chengquan Zhu ; Wei Lan ; Xueqin Liu
• 关键词：Nanostructures ; Oxides ; Chemical syntehsis ; Electron microscopy ; Microstructure
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：74
• 期：10
• 页码：1475-1481
• 全文大小：3377 K

文摘

The V₂O₅/TiO₂ nanoheterostructures with various morphologies were prepared by typical one-step electrospinning process. The effect of annealing temperatures and V/Ti molar ratio on the visible light photocatalytic activity of V₂O₅/TiO₂ nanoheterostructures was investigated by photodegradation of the Rhodamine B (RhB). The experimental results indicated that the annealing temperature and V/Ti molar ratios were important factors for the morphology of samples which influenced the number of efficient V₂O₅/TiO₂ nanoheterostructure. The V₂O₅/TiO₂ nanoheterostructures annealed at 400 ¡ãC with the V/Ti molar ratio of 1:1 exhibited the highest photocatalytic efficiency. Beyond 400 ¡ãC, the growth of V₂O₅ grains enhanced and big V₂O₅ rods formed on the V₂O₅/TiO₂ nanofibers, so the efficient V₂O₅/TiO₂ nanoheterostructures decreased, leading to the lower photocatalytic efficiency. The lower or higher V/Ti molar ratio could decrease the number of efficient V₂O₅/TiO₂ nanoheterostructures, which reduced the photocatalytic activity.