Journal
RSC ADVANCES
Volume 4, Issue 8, Pages 4187-4193Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra46079g
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Funding
- National Natural Science Foundation of China [21001093]
- 521 talent project of ZSTU
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Zhejiang Provincial Natural Science Foundation of China [LQ13B020006]
- Educational Commission of Zhejiang Province of China [Y201225426]
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Graphitic carbon nitride (C3N4)-BiVO4 heterojunctions with various mass ratios of C3N4 and BiVO4 were synthesized by a simple hydrothermal method. High-resolution transmission electron microscopy (HR-TEM) results show that an interface of intimate contact is formed between C3N4 and BiVO4 in heterojunctions. The UV-vis diffuse reflection spectra reveal that the resulting C3N4-BiVO4 heterojunctions exhibit more intensive absorption within the visible light range in comparison with pure C3N4. The photocatalytic tests demonstrate that the resulting C3N4-BiVO4 heterojunctions possess significantly enhanced photocatalytic activities for methylene blue (MB) degradation under visible light irradiation compared with individual C3N4 and BiVO4. The optimum photocatalytic activity of the 0.7 C3N4-0.3 BiVO4 heterojunction is almost 3.5 and 2.8 times higher than those of individual C3N4 and BiVO4, respectively. On the basis of experimental result, a possible photocatalytic mechanism that has superoxide radical species as the mainly active species in photocatalysis is proposed. Additionally, the present study provides a useful strategy to design heterojunction materials with enhanced photocatalytic performance.
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