Low temperature fabrication of Fe2O3 nanorod film coated with ultra-thin g-C3N4 for a direct z-scheme exerting photocatalytic activitiesopen access
- Authors
- Kang, Suhee; Jang, Joonyoung; Pawar, Rajendra C.; Ahn, Sung-Hoon; Lee, Sunyong Caroline
- Issue Date
- Oct-2018
- Publisher
- Royal Society of Chemistry
- Keywords
- VISIBLE-LIGHT IRRADIATION; ENHANCED PHOTOELECTROCHEMICAL PERFORMANCE; HYDROGEN-PRODUCTION; FACILE SYNTHESIS; HYBRID PHOTOCATALYSTS; WATER; ALPHA-FE2O3; EFFICIENT; DEGRADATION; TIO2
- Citation
- RSC Advances, v.8, no.59, pp.33600 - 33613
- Indexed
- SCIE
SCOPUS
- Journal Title
- RSC Advances
- Volume
- 8
- Number
- 59
- Start Page
- 33600
- End Page
- 33613
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/8029
- DOI
- 10.1039/c8ra04499f
- ISSN
- 2046-2069
- Abstract
- We engineered high aspect ratio Fe2O3 nanorods (with an aspect ratio of 17 : 1) coated with g-C3N4 using a sequential solvothermal method at very low temperature followed by a thermal evaporation method. Here, the high aspect ratio Fe2O3 nanorods were directly grown onto the FTO substrate under relatively low pressure conditions. The g-C3N4 was coated onto a uniform Fe2O3 nanorod film as the heterostructure, exhibiting rational band conduction and a valence band that engaged in surface photoredox reactions by a direct z-scheme mechanism. The heterostructures, particularly 0.75g-C3N4@Fe2O3 nanorods, exhibited outstanding photocatalytic activities compared to those of bare Fe2O3 nanorods. In terms of 4-nitrophenol degradation, 0.75g-C3N4@Fe2O3 nanorods degraded all of the organic pollutant within 6 h under visible irradiation at a kinetic constant of 12.71 x 10(-3) min(-1), about 15-fold more rapidly than bare Fe2O3. Further, the hydrogen evolution rate was 37.06 mmol h(-1) g(-1), 39-fold higher than that of bare Fe2O3. We suggest that electron and hole pairs are efficiently separated in g-C3N4@Fe2O3 nanorods, thus accelerating surface photoreaction via a direct z-scheme under visible illumination.
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