期刊
CHINESE CHEMICAL LETTERS
卷 33, 期 1, 页码 378-384出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.06.035
关键词
Mesoporous CeO2; Photocatalysis; Nanosheet; Surface oxygen vacancy; Surface defect
资金
- National Natural Science Foundation of China [21871078]
- Natural Science Foundation of Heilongjiang Province [JQ2019B001, LH2019B014]
- Youth Science and Technology Innovation Team Project of Heilongjiang Province [2018-KYYWF-1593]
Surface oxygen vacancy defects of mesoporous CeO2 nanosheets assembled microspheres (D-CeO2) are engineered, resulting in enhanced photocatalytic performance with improved degradation rate.
Surface oxygen vacancy defects of mesoporous CeO2 nanosheets assembled microspheres (D-CeO2) are engineered by polymer precipitation, hydrothermal and surface hydrogenation strategies. The resultant D-CeO2 with a main pore diameter of 9.3 nm has a large specific surface area (similar to 102.3 m(2)/g) and high thermal stability. The mesoporous nanosheets assembled microsphere structure prevents the nanosheets from aggregation, which is beneficial to effective mass transfer and shortens the migration distance of charge carriers. After surface hydrogenation, the photoresponse extends to long wavelength region, combing with the band gap from 2.63 eV reduced to 2.39 eV. Under AM 1.5 G radiation, the photocatalytic degradation rate of tetracycline (TC) can be up to 99.99%, which is three times as high as that of pristine CeO2 microspheres. The excellent solar-driven photocatalytic performance can be attributed to the efficient surface oxygen vacancy engineering and the mesoporous nanosheets assembled microsphere structure, which narrows the band gap, shortens the migration distance of carriers, promotes the spatial separation of photogenerated electron-hole pairs and favors mass transfer. The strategy provides new insights for fabricating other high-efficient oxide photocatalysts . (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
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