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P-doped tubular g-C3N4 with surface carbon defects: Universal synthesis and enhanced visible-light photocatalytic hydrogen production.
- Source :
-
Applied Catalysis B: Environmental . Dec2017, Vol. 218, p664-671. 8p. - Publication Year :
- 2017
-
Abstract
- Hetero-element doping or vacancy defects of g-C 3 N 4 framework were found significantly to control its electronic structure and enhance photocatalytic activity under visible light. Herein, we fabricated P-doped tubular g-C 3 N 4 (P-TCN) with surface carbon defects wherein the P-doping and carbon defects were conveniently introduced during thermal polymerization of a supramolecular precursor. The supramolecular precursor of rod-like morphology was obtained only from melamine molecules under a sodium pyrophosphate-assisted hydrothermal process. As contrast, similar P-doped g-C 3 N 4 tubes were obtained using other phosphates, such as ammonium phosphate, sodium hypophosphite and sodium phosphite, thus highlighting the versatility of this method to tune the morphology and C/N ratio for g-C 3 N 4 tubes. The photocatalytic activities of P-TCNs were evaluated using hydrogen evolution from water under visible light. Among these, P-TCN obtained by sodium pyrophosphate-assisted hydrothermal reaction showed the highest photocatalytic activity due to high P element doping, enhanced visible light absorption and improved charge separation. The novel synthetic method described here thus represents an effective way of non-metal doping and C/N ratio tuning of g-C 3 N 4 with excellent photocatalytic performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 218
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 124301739
- Full Text :
- https://doi.org/10.1016/j.apcatb.2017.07.022