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NO x degradation ability of S-g-C 3 N 4 /MgAl-CLDH nanocomposite and its potential application in cement-based materials.
- Source :
-
RSC advances [RSC Adv] 2023 Jul 18; Vol. 13 (31), pp. 21510-21520. Date of Electronic Publication: 2023 Jul 18 (Print Publication: 2023). - Publication Year :
- 2023
-
Abstract
- In this study a new photocatalytic nanocomposite, S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH, was synthesized and implemented into cement mortar by internal mixing or coating. The photocatalytic NO <subscript> x </subscript> degradation efficiency of the S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH and photocatalytic mortar was investigated. The NO <subscript> x </subscript> degradation efficiency and photoluminescence spectra of S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH after being immersed in the simulated concrete pore solution were evaluated to assess its chemical stability. The results show that compared with S-g-C <subscript>3</subscript> N <subscript>4</subscript> , the S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH exhibits a narrower bandgap (2.45 eV), a lower photogenerated electron-hole pair recombination rate and a higher specific surface area (36.86 m <superscript>2</superscript> g <superscript>-1</superscript> ). After 21 min of visible light irradiation, the NO <subscript> x </subscript> degradation rate of S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH achieves 100% as compared to merely 81.5% of S-g-C <subscript>3</subscript> N <subscript>4</subscript> . After being submerged in simulated concrete pore solution, the S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH exhibits only a slight decrease of 5% in degradation rate after 12 min of irradiation, confirming a good compatibility and stability in cement-based materials. The NO <subscript> x </subscript> degradation ability of the internally mixed mortar is enhanced with an increase in the dosage of S-g-C <subscript>3</subscript> N <subscript>4</subscript> /MgAl-CLDH. For coated mortar, in contrast, a decline in NO <subscript> x </subscript> degradation rate is observed after 5 layers of coating owing to the lower porosity of mortar after excessive coating.<br />Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (This journal is © The Royal Society of Chemistry.)
Details
- Language :
- English
- ISSN :
- 2046-2069
- Volume :
- 13
- Issue :
- 31
- Database :
- MEDLINE
- Journal :
- RSC advances
- Publication Type :
- Academic Journal
- Accession number :
- 37469967
- Full Text :
- https://doi.org/10.1039/d3ra04243j