Citation: Yuanyuan Lu, Guo Liu, Jing Zhang, Zhaochi Feng, Can Li, Zhi Li. Fabrication of a monoclinic/hexagonal junction in WO₃ and its enhanced photocatalytic degradation of rhodamine B[J]. Chinese Journal of Catalysis, ;2016, 37(3): 349-358. doi: 10.1016/S1872-2067(15)61023-3 shu

Fabrication of a monoclinic/hexagonal junction in WO₃ and its enhanced photocatalytic degradation of rhodamine B

Yuanyuan Lu ^a ,
Guo Liu ^a ,
Jing Zhang ^a,, ,
Zhaochi Feng ^b ,
Can Li ^b ,
Zhi Li ^c

1.
a College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China;
2.
b State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
3.
c Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: Jing Zhang,
Received Date: 25 November 2015
Available Online: 27 November 2015
Fund Project: 国家自然科学基金(21573101) (21573101)辽宁省自然科学基金(2014020107) (2014020107)辽宁省高等学校优秀人才支持计划(LJQ2014041) (LJQ2014041)教育部留学回国人员科研启动基金(教外司留[2013]1792号) (教外司留[2013]1792号)中国科学院北京理化技术研究所光化学转换与光电材料重点实验室和中国科学院大连化学物理研究所催化基础国家重点实验室开放课题(CAS,N-09-06). (CAS,N-09-06)

A series of WO₃ samples with different crystalline phases were prepared by the thermal decomposition method from ammonium tungstate hydrate. X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy, and N₂ adsorption-desorption were used to characterize the crystalline phase, morphology, particle size, chemical composition, and surface area of the WO₃ samples. The formation of hexagonal (h-WO₃) and monoclinic (m-WO₃) crystal structures of WO₃ at different temperatures or different times was confirmed by XRD. m-WO₃ is formed at 600 ℃, while m-WO₃ starts to transform into h-WO₃ at 800 ℃. However, h-WO₃, which forms at 800 ℃, may transform into m-WO₃ by increasing the calcination temperature to 1000 ℃. SEM results indicate that m-WO₃ particles exhibit a bulky shape with heavy aggregates, while h-WO₃ particles exhibit a rod-like shape. Moreover, m-WO₃ crystals are sporadically patched on the surface of the h-WO₃ rod-like particles, resulting in the exposure of both m-WO₃ and h-WO₃ on the surface. It is observed that the monoclinic phase (m-WO₃)/hexagonal phase (h-WO₃) junction was fabricated by tuning the calcination temperature and calcination time. The relative ratios between m-WO₃ and h-WO₃ in the phase junction can readily be tailored by control of the calcination time. The photocatalytic activities of WO₃ with different crystalline phases were evaluated by the photocatalytic degradation of rhodamine B as a model pollutant. A higher photocatalytic activity was observed in the WO₃ sample with the m-WO₃/h-WO₃ junction as compared with the sample with only m-WO₃. The improvement of photocatalytic activity can be attributed to the reduction of the electron-hole recombination rate owing to the formation of the phase junction, whose presence has been confirmed by HRTEM and photoluminescence spectra.
- Tungsten oxide,
- Phase junction,
- Thermal decomposition method,
- Photocatalysis,
- Rhodamine B
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Fabrication of a monoclinic/hexagonal junction in WO3 and its enhanced photocatalytic degradation of rhodamine B

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Fabrication of a monoclinic/hexagonal junction in WO₃ and its enhanced photocatalytic degradation of rhodamine B