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Hydrothermal oxidation synthesis of rod‐like ZnO and the influence of oxygen vacancy on photocatalysis
Author(s) -
Wang Yao,
Wang Baojian,
Xu Ying,
Fang Min,
Wu Zhenyu,
Zhu Weiju,
Hong Jianghui,
Li Cun
Publication year - 2017
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201600787
Subject(s) - photocatalysis , chemistry , x ray photoelectron spectroscopy , photodegradation , oxygen , nanorod , zinc , hydrothermal circulation , scanning electron microscope , annealing (glass) , diffuse reflectance infrared fourier transform , photochemistry , nanoparticle , nuclear chemistry , chemical engineering , catalysis , nanotechnology , materials science , organic chemistry , metallurgy , engineering , composite material
Rod‐like ZnO nanoparticles ( NPs ) were synthesized from zinc powder by a simple hydrothermal oxidation method. The presence of acetylacetone could promote the oxidation reaction of Zn and the formation of hexagonal nanorods. Then, the as‐prepared samples were annealed in N 2 , O 2 , and air atmosphere at 550°C for 2 h to control the number of oxygen vacancies in the samples. The samples were characterized by X‐ray diffraction, scanning electron microscopy, X‐ray photoelectron spectroscopy, and UV –vis spectroscopy. The correlation between the oxygen vacancies and the photocatalytic activity was investigated. The results reveal that the annealing process alters the samples’ bandgap and number of the oxygen vacancies, thereby improving the photocatalytic activity. The enhancement of photodegradation efficiency arising from the appropriate content of oxygen vacancies is discussed.