Fabrication of g-C3N4/SiO2-Au composite nanofibers with enhanced visible photocatalytic activity
2019/11/27 21:19:24
Zhou, X. J., G. Zhang, C. L. Shao, X. H. Li, X. Jiang and Y. C. Liu
Graphitic carbon nitride (g-C3N4) based ternary composite photocatalyst (g-C3N4/SiO2-Au NFs) was prepared using Au nanoparticles (NPs) decorated SiO2 nanofibers (SiO2-Au NFs) as a support by employing a heat treatment with a mixture of urea powder and SiO2-Au NFs. The resulting Au NPs with the mean diameter of about 13 nm were evenly dispersed on the g-C3N4/SiO2-Au NFs. In addition, the thin g-C3N4 nano-layers were found to be uniformly grown on the g-C3N4/SiO2-Au NFs as determined by electron microscopy and elemental mapping image analyses. Comparative studies revealed that the g-C3N4/SiO2-Au NFs showed better photo catalytic activity for the degradation of Rhodamine B (RhB) under visible light than g-C3N4/SiO2 NFs, which was prepared by the same process. The photocurrent enhancement of the g-C3N4/SiO2-Au NFs also indicated an enhanced separation of photo-induced electron-hole pairs. In addition, both the g-C3N4/SiO2-Au and g-C3N4/SiO2 NFs could be easily precipitated and separated, which resulted from their ultra-long one-dimensional nanostructure. Also, the g-C3N4/SiO2-Au NFs exhibited high stability could be reused with little loss of photocatalytic activity after three recycles.
- Journal: Ceramics International
- Volume: 43
- Issue: 17
- Pages: 15699-15707
- ISSN: 0272-8842
- DOI: 10.1016/j.ceramint.2017.08.130
- Year: 2017
- Number:
- Type:
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