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采用火花法制备具有增强可见光光催化性能的多孔 VO/TiO 纳米异质结构薄膜。

Porous VO/TiO Nanoheterostructure Films with Enhanced Visible-Light Photocatalytic Performance Prepared by the Sparking Method.

机构信息

Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.

Ph.D's Degree Program in Applied Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.

出版信息

Molecules. 2020 Jul 22;25(15):3327. doi: 10.3390/molecules25153327.

DOI:10.3390/molecules25153327
PMID:32707984
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7435749/
Abstract

Porous VO/TiO nanoheterostructure films with different atomic ratios of Ti/V (4:1, 2:1, 1:1, and 1:2) were synthesized by a sparking method for the first time. The sparking method, which is a simple and cost-effective process, can synthesize highly porous and composite films in one step. Field-emission scanning electron microscope (FE-SEM) images revealed the porosity morphology of all prepared samples. VO/TiO nanoheterostructure films were confirmed by Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The secondary particle size and band gap of the samples were highly correlated to the VO proportion, resulting in enhanced visible-light absorbance. VO/TiO nanoheterostructure films at an atomic ratio of 1:1 showed the highest photocatalytic performance, which improved the degradation rate up to 24% compared to pure TiO film. It is believed that the formed nanoheterostructure and greater portion of V ions are reflected by this ratio.

摘要

首次采用火花放电法合成了不同 Ti/V 原子比(4:1、2:1、1:1 和 1:2)的多孔 VO/TiO 纳米异质结构薄膜。火花放电法是一种简单且具有成本效益的工艺,可一步合成高多孔和复合薄膜。场发射扫描电子显微镜(FE-SEM)图像揭示了所有制备样品的多孔形态。通过拉曼光谱、高分辨率透射电子显微镜(HRTEM)和 X 射线光电子能谱(XPS)证实了 VO/TiO 纳米异质结构薄膜的存在。样品的二次颗粒尺寸和带隙与 VO 的比例高度相关,导致可见光吸收率增强。原子比为 1:1 的 VO/TiO 纳米异质结构薄膜表现出最高的光催化性能,与纯 TiO 薄膜相比,降解率提高了 24%。据认为,这种比例反映了形成的纳米异质结构和更多的 V 离子。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/2b7e9520f240/molecules-25-03327-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/2e69338d66c9/molecules-25-03327-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/dfc123caf3b3/molecules-25-03327-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/b9c8177f57dd/molecules-25-03327-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/cc18dcfd7d50/molecules-25-03327-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/6c6dd21221a9/molecules-25-03327-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/05701c4956af/molecules-25-03327-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/12a5550820c0/molecules-25-03327-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/2b7e9520f240/molecules-25-03327-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/2e69338d66c9/molecules-25-03327-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/dfc123caf3b3/molecules-25-03327-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/b9c8177f57dd/molecules-25-03327-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/cc18dcfd7d50/molecules-25-03327-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/6c6dd21221a9/molecules-25-03327-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/05701c4956af/molecules-25-03327-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/12a5550820c0/molecules-25-03327-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b930/7435749/2b7e9520f240/molecules-25-03327-g008.jpg

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