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Nano-TiO 2 -Enhanced Surface Functionalization of Recycled Concrete Aggregates for Improved Degradation Efficiency of Low-Concentration Sulfur Dioxide.

Authors :
Chen, Xue-Fei
Chen, Wei-Zhi
Zhang, Xiu-Cheng
Lin, Wen-Cong
Zheng, Jian-Sheng
Yan, Guo-Hui
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