Back to Search
Start Over
Fabrication of graphitic carbon nitride synthesized via pyrolysis for environmental remediation: a detailed experimental analysis with different parametric optimizations.
- Source :
- New Journal of Chemistry; 5/7/2024, Vol. 48 Issue 17, p7921-7939, 19p
- Publication Year :
- 2024
-
Abstract
- This paper reports on the photodegradation of the Rh 6G dye using a g-C<subscript>3</subscript>N<subscript>4</subscript> (g-CN) nanosheet photocatalyst under UV light irradiation. The g-C<subscript>3</subscript>N<subscript>4</subscript> nanosheets were synthesized using a simple pyrolysis method at 450 °C for 3 h at a heating rate of 2 °C min<superscript>−1</superscript>. Their structural phase, functional groups, surface area, optical properties, elemental composition, and morphology were investigated via XRD, BET, UV-vis, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, and SEM microscopy. The tri-s-triazine structure of g-C<subscript>3</subscript>N<subscript>4</subscript> was confirmed and the crystal size was calculated to be 5 nm. g-C<subscript>3</subscript>N<subscript>4</subscript> displayed a nanosheet morphology with a BET surface area of 8 m<superscript>2</superscript> g<superscript>−1</superscript>. C–N stretching and s-triazine units were observed in the FTIR spectrum. The photoluminescence (PL) emission maximum at 432 nm provided band edge emission related to a band gap of 2.9 eV, and the PL lifetime was 7.6 ns, which is reasonably high for photocatalytic application. Through the C1s XPS spectrum, sp<superscript>2</superscript>-hybridized carbon linkages of N–C=N in the aromatic skeleton rings, such as triazine or heptazine rings, of g-C<subscript>3</subscript>N<subscript>4</subscript> were found. The photocatalytic characteristics of g-C<subscript>3</subscript>N<subscript>4</subscript> were studied with the Rh-6G dye using UV light illumination. Initially, the Rh-6G dye concentration and catalyst (g-C<subscript>3</subscript>N<subscript>4</subscript>) loading were optimized for the best dye degradation at 0.01 mmol and 50 mg, respectively. The maximum efficiency of g-C<subscript>3</subscript>N<subscript>4</subscript> was 99.6% degradation of the Rh-6G dye in 300 minutes. Lower charge-transfer resistance was found to be the reason for the enhanced photodegradation activity. The most dominant reactive species that participated in the light-activated reaction were superoxide radicals. The influence of pH on photodegradation was studied and the photocatalyst was found to perform better in an acidic pH range. In addition, g-C<subscript>3</subscript>N<subscript>4</subscript> was structurally stable, highly recyclable, and, therefore, could be reused in many cycles of photocatalysis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 48
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 176911898
- Full Text :
- https://doi.org/10.1039/d4nj01233j