期刊
NANOMATERIALS
卷 12, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/nano12162879
关键词
tungsten trioxide; co-exposed crystal facets; photocatalytic activity; synergistic effect
类别
资金
- Applied Basic Research Project of Shanxi [201901D111303, 20210302123494]
- Shanxi Scientific and Technological Innovation Programs of Higher Education Institutions [2019L0881, 2020L0602]
- Jinzhong University 1331 Project Key Innovation Team [jzxycxtd2019005]
- Research Start-up Fee of Jinzhong University
- The 12th Batch of One Hundred Talent Plan Project in Shanxi Province [128. 129]
In this study, WO3 nanocrystals with different crystal facets were prepared using a simple hydrothermal treatment method, and their properties were characterized comprehensively. The pH7.0-WO3 nanocrystals with co-exposed {202} and {020} facets exhibited the highest photocatalytic activity.
In this paper, rod-shaped, cuboid-shaped, and irregular WO3 nanocrystals with different co-exposed crystal facets were prepared for the first time by a simple hydrothermal treatment of tungstic acid colloidal suspension with desired pH values. The crystal structure, morphology, specific surface area, pore size distribution, chemical composition, electronic states of the elements, optical properties, and charge migration behavior of as-obtained WO3 products were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), fully automatic specific surface area and porosity analyzer, UV-vis absorption spectra, photoluminescence (PL) spectra, and electrochemical impedance spectroscopy (EIS). The photocatalytic performances of the synthesized pHx-WO3 nanocrystals (x = 0.0, 1.5, 3.0, 5.0, and 7.0) were evaluated and compared with the commercial WO3 (CM-WO3) nanocrystals. The pH7.0-WO3 nanocrystals with co-exposed {202} and {020} facets exhibited highest photocatalytic activity for the degradation of methylene blue solution, which can be attributed to the synergistic effects of the largest specific surface area, the weakest luminescence peak intensity and the smallest arc radius diameter.
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