Journal
MATERIALS RESEARCH BULLETIN
Volume 135, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.111161
Keywords
Composites; Semiconductors; Solvothermal; Catalytic properties
Categories
Funding
- National Natural Science Foundation of China [21906039, 22006057]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07206-004]
- Shanghai Sailing Program [20YF1400300]
- Natural Science Foundation of Shaanxi Province [2019JQ-382]
- Fundamental Research Funds for the Central Universities of Chang'an University [300102290501]
- Funding Project for Introduced Overseas Scholars of Hebei Province [C20190321]
- Science and Technology Project of Hebei Education Department [QN2020403]
- Program for water resources research and promotion of Hebei Province [2019-55]
- Doctoral research fund of Hebei Geo University [BQ2019041]
- Doctor of Mass entrepreneurship and innovation Project in Jiangsu Province and Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology [1062931806, 1142931803]
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By decorating CoO on BiVO4 to form a CoO/BiVO4 heterojunction, a high-efficiency photocatalytic degradation activity was achieved, mainly due to the improved separation efficiency of photogenerated carriers and the maintenance of the stability and reusability of the photocatalyst.
A noble-metal-free CoO/BiVO4 p-n heterojunctions with micro-nano spherical structure were synthesized via a simple solvothermal method. The morphology, crystal structure, composition and properties of the as-prepared samples were investigated by XRD, SEM, TEM, UV-vis and XPS. 30 wt% CoO/BiVO4 sample revealed the most excellent photocatalytic activity of TC (87.3 %, 90 min). The degradation rate constant was 0.022964 min(-1), which was 3.72 and 2.54 times higher than pure CoO and BiVO4. The enhanced photocatalytic activity and stability are due to decorating CoO on BiVO4 avoid deactivating caused by serious agglomeration and the formation of the built-in electric field which could improve the separation efficiency of photogenerated carriers with an apparent quantum efficiency of 0.54 %. Furthermore, the photocatalyst were reused for five cycles and remained 95.7 % of the raw sample, indicating it has the extraordinary stability and reusability. The study on photocatalytic mechanism proved that O-2(-center dot) and h(+) were the primary species in photocatalytic system.
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