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Nano-TiO 2 -Enhanced Surface Functionalization of Recycled Concrete Aggregates for Improved Degradation Efficiency of Low-Concentration Sulfur Dioxide.
- Source :
- Catalysts (2073-4344); Oct2024, Vol. 14 Issue 10, p709, 11p
- Publication Year :
- 2024
-
Abstract
- This study investigates the enhancement of recycled concrete aggregate (RCA) surfaces with nano-TiO<subscript>2</subscript> for an improved degradation of low-concentration sulfur dioxide (SO<subscript>2</subscript>). Nano-TiO<subscript>2</subscript> particles, known for their photocatalytic properties, were uniformly deposited on RCA surfaces. Upon exposure to SO<subscript>2</subscript> under light irradiation, the functionalized RCA exhibited significantly improved degradation efficiency. This was attributed to the photo-induced oxidation of SO<subscript>2</subscript> by nano-TiO<subscript>2</subscript>. Enhanced degradation was further observed under UV light due to increased photoactivation. The nano-TiO<subscript>2</subscript> coating also showed good durability and stability, ensuring long-term effectiveness. The experimental outcomes reveal that TiO<subscript>2</subscript>-treated recycled aggregates exhibit an 85% retained photocatalytic activity post five cycles of reuse. Furthermore, the investigation employs a second-order polynomial-based mathematical fitting function to generate a three-dimensional trend surface, visually illustrating the inverse relationships between sulfur dioxide degradation and environmental variables, such as initial concentration and flow rates. Finally, this study demonstrates the potential of nano-TiO<subscript>2</subscript>-modified RCA for mitigating the environmental impact of low-concentration SO<subscript>2</subscript>, contributing to the development of more sustainable construction materials and broadening RCA's applications in environmental remediation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734344
- Volume :
- 14
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Catalysts (2073-4344)
- Publication Type :
- Academic Journal
- Accession number :
- 180557081
- Full Text :
- https://doi.org/10.3390/catal14100709