Photocatalytic NO x Removal Performance of TiO 2 -Coated Permeable Concrete: Laboratory Optimization and Field Demonstration.
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| Title: | Photocatalytic NO x Removal Performance of TiO 2 -Coated Permeable Concrete: Laboratory Optimization and Field Demonstration. |
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| Authors: | Kim, Han-Na1 (AUTHOR), Kim, Hyeok-Jung2 (AUTHOR) ceasare@hoseo.edu |
| Source: | Materials (1996-1944). Jan2026, Vol. 19 Issue 1, p148. 17p. |
| Subjects: | Titanium dioxide, Urban pollution, Field research, Photocatalysis, Concrete, Sustainability, Abatement (Atmospheric chemistry), Laboratory techniques |
| Abstract: | Nitrogen oxides (NOx) emitted mainly from vehicle exhaust significantly contribute to urban air pollution, leading to photochemical smog and secondary particulate matter. Photocatalytic technology has emerged as a promising solution for continuous NOx decomposition under ultraviolet (UV) irradiation. This study developed an eco-friendly permeable concrete incorporating activated loess and zeolite to improve roadside air quality. The high porosity and adsorption capability of the concrete provided a suitable substrate for a TiO2-based photocatalytic coating. A single-component coating system was optimized by introducing colloidal silica to enhance TiO2 particle dispersibility and adding a binder to secure durable adhesion on the concrete surface. The produced permeable concrete met sidewalk quality standards specified in SPS-F-KSPIC-001-2006. Photocatalytic NOx removal performance evaluated by ISO 22197-1 showed a maximum removal efficiency of 77.5%. Even after 300 h of accelerated weathering, the activity loss remained within 13.8%, retaining approximately 80% of the initial performance. Additionally, outdoor mock-up testing under natural light confirmed NOx concentration removal and formation of nitrate by-products, demonstrating practical applicability in real environments. Overall, the integration of permeable concrete and a durable, single-component TiO2 photocatalytic coating provides a promising approach to simultaneously enhance pavement sustainability and reduce urban NOx pollution. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Nitrogen oxides (NOx) emitted mainly from vehicle exhaust significantly contribute to urban air pollution, leading to photochemical smog and secondary particulate matter. Photocatalytic technology has emerged as a promising solution for continuous NOx decomposition under ultraviolet (UV) irradiation. This study developed an eco-friendly permeable concrete incorporating activated loess and zeolite to improve roadside air quality. The high porosity and adsorption capability of the concrete provided a suitable substrate for a TiO2-based photocatalytic coating. A single-component coating system was optimized by introducing colloidal silica to enhance TiO2 particle dispersibility and adding a binder to secure durable adhesion on the concrete surface. The produced permeable concrete met sidewalk quality standards specified in SPS-F-KSPIC-001-2006. Photocatalytic NOx removal performance evaluated by ISO 22197-1 showed a maximum removal efficiency of 77.5%. Even after 300 h of accelerated weathering, the activity loss remained within 13.8%, retaining approximately 80% of the initial performance. Additionally, outdoor mock-up testing under natural light confirmed NOx concentration removal and formation of nitrate by-products, demonstrating practical applicability in real environments. Overall, the integration of permeable concrete and a durable, single-component TiO2 photocatalytic coating provides a promising approach to simultaneously enhance pavement sustainability and reduce urban NOx pollution. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961944 |
| DOI: | 10.3390/ma19010148 |
