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A novel molecularly expanded covalent triazine framework heterojunction with significantly enhanced molecular oxygen activation and photocatalysis performance under visible light.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 8/28/2023, Vol. 52 Issue 32, p11272-11284, 13p
- Publication Year :
- 2023
-
Abstract
- The activation capacity of molecular oxygen is an important indicator to evaluate the photocatalytic efficiency of photocatalysts. In this paper, WS<subscript>2</subscript> nanosheet was deposited on hyper-crosslinked CTF-1-G (obtained by molecular expansion from covalent triazine framework CTF-1) to form a C-GW heterojunction, which promoted the photodegradation of pollutants and the activation of molecular oxygen. This novel C-GW heterojunction exhibited excellent degradation property for organic pollutants (tetracycline (TC), rhodamine B (RhB)) and activating molecular oxygen under visible light irradiation. Among them, C-GW<subscript>15</subscript> could degrade 98% of 20 ppm TC in 60 min and 99% of 30 ppm RhB in 30 min, and it had the highest hydrogen generation rate and hydrogen production amount in 4 hours, which were 8.74 mmol h<superscript>−1</superscript> g<superscript>−1</superscript> and 34.94 mmol g<superscript>−1</superscript>, respectively. Meanwhile, C-GW<subscript>15</subscript> had the strongest 3,3′,5,5′-tetramethylbenzidine oxidation capacity and could generate 1.83 μmol of ˙O<subscript>2</subscript><superscript>−</superscript> in 60 min and the production of H<subscript>2</subscript>O<subscript>2</subscript> was 20.8 μmol L<superscript>−1</superscript> in 40 min. The results of this study clearly indicated that the combination of WS<subscript>2</subscript> and CTF-1-G can enhance the visible light absorption capacity and photogenerated carrier separation efficiency, thus promoting the photocatalytic performance. Finally, a Z-type photocatalytic mechanism was proposed based on radical capture, molecular oxygen activation experiments and electron spin resonance analysis. These findings will extend the fundamental understanding of the Z-type photocatalytic mechanism and provide new opportunities for the rational design of CTF heterojunctions for the treatment of environmental pollution and clean energy conversion. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 52
- Issue :
- 32
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 169952455
- Full Text :
- https://doi.org/10.1039/d3dt01726e