期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 216, 期 -, 页码 70-79出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.05.038
关键词
Graphitic carbon nitride; Sonochemical method; Heterojunction; Photooxidation; Water treatment
资金
- Ministry of Science, Technology, and Innovation (through SisNANO Program - National System of Laboratories in Nanotechnology)
- National Council for Scientific and Technological Development (CNPq) [402.287/2013-4]
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- Sao Paulo Research Foundation (FAPESP) [13/13888-0, 15/12304-0, 16/09746-3]
- Embrapa Rede AgroNano
- FAPESP [13/17639-4]
- Structural Characterization Laboratory (LCE) [13839]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [16/09746-3, 13/13888-0] Funding Source: FAPESP
In this study, g-C3N4/Nb2O5 heterostructures were successfully prepared by a sonochemical method based on surface charge -induced heteroaggregation. Under visible irradiation, the heterostructured gC(3)N(4)/Nb2O5 samples exhibited higher activity in the photooxidation of the drug amiloride (AML) and rhodamine B dye (RhB), compared to the pure g-C3N4 and Nb2O5 phases. The enhanced photocatalytic activity of the heterostructures could be attributed to the effective formation of heterojunctions between the g-C3N4 and Nb2O5 semiconductors, causing the migration of photogenerated electrons and holes, hence increasing their lifetimes. Formation of the type -II heterostructure was confirmed by time -resolved photoluminescence, in which the 3CN:1Nb heterostructure showed the longest electron/hole pair lifetime. The 3CN:1Nb and 1CN:3Nb heterostructures exhibited high stability even after four cycles of reuse in RhB dye and drug AML oxidation, respectively. In summary, the combination of g-C3N4 with Nb2O5 to produce a type -II heterostructure is a good strategy to overcome important challenges in photocatalysis. (C) 2017 Elsevier B.V. All rights reserved.
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