Morphology control and photocatalytic characterization of WO3 nanofiber bundles
Morphology control and photocatalytic characterization of WO3 nanofiber bundles
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WO3纳米纤维束的形貌控制和光催化表征
DOI：
10.1016/j.cclet.2018.03.009
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发表时间：
2018-09
影响因子：
9.1
通讯作者：
Zhang Bingsen
中科院分区：
文献类型：
--
作者：
Zhang Ying;Zhang Defeng;Xu Xinyu;Zhang Bingsen
半导体光催化剂的设计和制造引起了人们的广泛关注。本文详细研究了pH值和可溶性盐添加剂对WO3晶体结构、形貌和光催化性能的影响。结果发现，随着溶液pH值的增加，WO3的相结构由单斜相转变为六方相。紫外-可见吸收光谱表明单斜晶系和六方晶系WO3在600 nm至紫外-可见光区都有吸收。在pH值为0.8时，采用Na2SO4和Zn(CH3COO)2·2H2O辅助水热法成功合成了具有纳米纤维束形貌的六方WO3。它表现出最高的光催化效率，优于立方单斜晶系WO3。在pH 1.4 下制备的梭状六方WO3 活性低得多。形貌是WO3光催化性能的决定性参数。
The design and fabrication of semiconductor photocatalysts have attracted much attention. Herein, the effect of pH value and soluble salt additives on crystal structure, morphology and photocatalytic properties of WO3was investigated in detail. It was found that the phase structure of WO3changed from monoclinic to hexagonal phase when pH value of the solution increased. The ultraviolet-visible absorption spectra show that the monoclinic and hexagonal WO3had absorbance from 600 nm to the ultraviolet-visible region. Hexagonal WO3with nanofiber bundle morphology was successfully synthesized through Na2SO4and Zn(CH3COO)2·2H2O-assisted hydrothermal method when pH value was 0.8. It exhibits the highest photocatalytic efficiency and better than that of cubic-shaped monoclinic WO3. The shuttle-like hexagonal WO3prepared at pH 1.4 gives much lower activity. The morphology is a decisive parameter for the photocatalytic properties of WO3.
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