期刊
ACS OMEGA
卷 3, 期 9, 页码 12260-12269出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.8b01449
关键词
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资金
- UGC JRF [F.19-1/2013(SA-I)]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2015A030306044]
- National Natural Science Foundation of China [51776094]
- Guangdong-Hong Kong joint innovation project [2016A050503012]
- National Key Research and Development Project from the Ministry of Science and Technology [2016YFA0202400, 2016YFA0202404]
- Training Program for Outstanding Young Teachers at Higher Education Institutions of Guangdong Province [YQ2015151]
- Southern University of Science and Technology
Limited light absorption, inefficient electron-hole separation, and unsuitable positions of conduction band bottom and/or valence band top are three major critical issues associated with high-efficiency photocatalytic water treatment. An attempt has been carried out here to address these issues through the synthesis of direct Z-scheme Cs2O-Bi2O3-ZnO heterostructures via a facile, fast, and economic method: solution combustions synthesis. The photocatalytic performances are examined by the 4-chlorophenol degradation test under simulated sunlight irradiation. UV-vis diffuse reflectance spectroscopy analysis, electrochemical impedance test, and the observed transient photocurrent responses prove not only the significant role of Cs2O in extending light absorption to visible and near-infrared regions but also its involvement in charge carrier separation. Radical-trapping experiments verify the direct Z-scheme approach followed by the charge carriers in heterostructured Cs2O-Bi2O3-ZnO photocatalysts. The Z-scheme charge carrier pathway induced by the presence of Cs2O has emerged as the reason behind the efficient charge carrier separation and high photocatalytic activity.
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