Back to Search
Start Over
Boosting the Photoreactivity of g-C 3 N 4 towards CO 2 Reduction by Polymerization of Dicyandiamide in Ammonium Chloride.
- Source :
- Catalysts (2073-4344); Sep2023, Vol. 13 Issue 9, p1260, 12p
- Publication Year :
- 2023
-
Abstract
- As a typical organic semiconductor photocatalyst, graphitic carbon nitride (g-C<subscript>3</subscript>N<subscript>4</subscript>) suffers from low photocatalytic activity. In this paper, g-C<subscript>3</subscript>N<subscript>4</subscript> was prepared by polymerization of dicyandiamide (C<subscript>2</subscript>H<subscript>4</subscript>N<subscript>4</subscript>) in the presence of ammonium chloride (NH<subscript>4</subscript>Cl). It was found that the addition of ammonium chloride can greatly improve the photocatalytic activity of g-C<subscript>3</subscript>N<subscript>4</subscript> towards CO<subscript>2</subscript> reduction. The optimal photocatalyst (CN-Cl 20) exhibited a CO<subscript>2</subscript>-to-CO conversion activity of 50.6 μmolg<superscript>−1</superscript>h<superscript>−1</superscript>, which is 3.1 times that of pristine bulk g-C<subscript>3</subscript>N<subscript>4</subscript> (BCN) that was prepared in the absence of any ammonium chloride. The enhanced photoactivity of g-C<subscript>3</subscript>N<subscript>4</subscript> was attributed to the combined effects of chloride modification and an enlarged specific surface area. Chloride modification of g-C<subscript>3</subscript>N<subscript>4</subscript> can not only reduce the bandgap, but also causes a negatively shifted conduction band (CB) potential level, while ammonia (NH<subscript>3</subscript>) gas from the decomposition of NH<subscript>4</subscript>Cl can act as a gas template to exfoliate layered structure g-C<subscript>3</subscript>N<subscript>4</subscript>, improving the specific surface from 6.8 to 21.3 m<superscript>2</superscript>g<superscript>−1</superscript>. This study provides new ideas for the synthesis of highly efficient g-C<subscript>3</subscript>N<subscript>4</subscript>-based photocatalytic materials for CO<subscript>2</subscript> conversion and utilization. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734344
- Volume :
- 13
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Catalysts (2073-4344)
- Publication Type :
- Academic Journal
- Accession number :
- 172411024
- Full Text :
- https://doi.org/10.3390/catal13091260