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Article

Evaluation of Reducing NO and SO2 Concentration in Nano SiO2-TiO2 Photocatalytic Concrete Blocks

1
Department of Highway and Transportation Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si 10223, Korea
2
Department of Construction Engineering Education, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Sérgio Manuel Rodrigues Lopes and Luigi Coppola
Materials 2021, 14(23), 7182; https://doi.org/10.3390/ma14237182 (registering DOI)
Received: 13 October 2021 / Revised: 15 November 2021 / Accepted: 19 November 2021 / Published: 25 November 2021
The use of titanium dioxide in concrete block pavements is a promising approach to reduce air pollution in the roadside. When TiO2 is used as an additive of cement concrete or mortar, it is not dispersed uniformly due to agglomeration between particles causing the degradation of photocatalytic reaction. To improve the photocatalytic performance of TiO2, the Nano SiO2-TiO2 (NST) has been developed by coating TiO2 with SiO2 as a support using the sol-gel method. The environmental performance of concrete blocks incorporating NST as an additive was evaluated using both laboratory and full-scale chamber experiments. It was observed from laboratory environment chamber testing that the NO reduction efficiency of concrete blocks with 4% NST ranged from 16.5 to 59.1%, depending on the UV intensity. Results of the full-scale chamber test on NST concrete blocks indicated that the NO and SO2 reduction efficiencies were 22.3% and 14.4% at a 564W/m2 of solar radiation, respectively. It was found that the increase in UV intensity and solar radiation had a positive effect on decreasing NO and SO2 concentration. In the future, the NST will be applied at in-service photocatalytic block pavements to validate the environmental performance in field conditions.
Keywords: titanium dioxide; photocatalyst; nitrogen oxide; concrete block titanium dioxide; photocatalyst; nitrogen oxide; concrete block
MDPI and ACS Style

Lee, J.W.; Lee, S.H.; Jang, Y.I.; Park, H.M. Evaluation of Reducing NO and SO2 Concentration in Nano SiO2-TiO2 Photocatalytic Concrete Blocks. Materials 2021, 14, 7182. https://doi.org/10.3390/ma14237182

AMA Style

Lee JW, Lee SH, Jang YI, Park HM. Evaluation of Reducing NO and SO2 Concentration in Nano SiO2-TiO2 Photocatalytic Concrete Blocks. Materials. 2021; 14(23):7182. https://doi.org/10.3390/ma14237182

Chicago/Turabian Style

Lee, Jong W., Sang H. Lee, Young I. Jang, and Hee M. Park 2021. "Evaluation of Reducing NO and SO2 Concentration in Nano SiO2-TiO2 Photocatalytic Concrete Blocks" Materials 14, no. 23: 7182. https://doi.org/10.3390/ma14237182

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