Evaluation of air cleaning using functionalized asphalt mixture sprayed with TiO 2 nanoparticles

1University of Minho, ISISE, ARISE, Department of Civil Engineering, Guimarães, Portugal. 2Centre of Physics of Minho and Porto Universities (CF-UM-UP), Azurém Campus, University of Minho, Guimarães, Portugal. 3Energy and Geology National Laboratory, LNEG Campus Lumiar, Lisbon, Portugal. Photocatalytic asphalt mixtures have gained attention as a possible alternative to mitigate the air pollution in urban areas. The asphalt surface when functionalized with nano-TiO2can reduce nitrogen oxides (NOx), a harmful pollutant emitted by vehicles that contributes to problems such as acid rain and public health concerns. The main objective of this research is to evaluate the NOxair cleaning promoted by the functionalized asphalt mixture. For this, an asphalt mixture AC 10 was functionalized by spraying TiO2nanoparticles and then evaluated using a photoreactor under the standard ISO 22197-1. The objective of the research was to degrade NOxby using photocatalytic asphalt samples. It was possible to remove up to 760 ppb of NOx. The next step of this research is to study different parameters of photocatalysis (pollutant concentration, humidity, wind speed, pollutant flow and irradiation). NO OH* + NO NO2 NO3TiO2 Photocatalytic layer H2O Asphalt Pavement Élida Margalho1,2*, Orlando Lima Jr.1,2, Iran Rocha Segundo1,2*, Clarisse Nunes3, Carlos Tavares2, Elisabete Freitas1*, Joaquim Carneiro2*. Evaluation of Air Cleaning using Functionalized Asphalt Mixture Sprayed with TiO2Nanoparticles * correspondence: [email protected] (ÉM); [email protected]o.pt (IRS); [email protected] (EF); [email protected] (JC) Nano-TiO2 dispersed in ethanol Spray Coating Method Asphalt Sample 1. INTRODUCTION 2 1 3 4 5 6 7 89 1. NO source 2. air compressor 3. humidifier 4. gas mixer 5. reactor 6. paving slab 7. Light source 8. NOx analyzer 9. Computer. 2. OBJECTIVES NO NO2 No light Light No light Adsorption by the sample Pollutant concentration adjustment NO, NO2 Time Feed Level III III I II III NO flows directly to the analyzer. NO flows to the reactor and then to the analyzer without light. NO flows to the reactor and then to the analyzer with light. NOx The air purification performance Removal NOx= NO removed –NO2formed CT/MCTES sponsored this research by the projects NanoAir PTDC/FISMAC/6606/2020, MicroCoolPav EXPL/EQU-EQU/1110/2021 and UIDB/04650/2020, under the R&D from ISISE (UIDB/04029/2020) and the ARISE (LA/P/0112/2020). Also, the second and third authors would like to acknowledge the FCT for funding PRT/BD/154269/2022, 2022.00763.CEECIND, respectively. Inputs NOx: 90 scrm* Dry air: 1300 scrm* UV power density: 10 W/m² Initial NOx: 700 ppb Inputs NOx: 30 scrm* Dry air: 1300 scrm* UV power density: 10 W/m² Initial NOx: 200 ppb Removal NOx: 192.29 ppb 3. METHODOLOGY 4. RESULTS AND DISCUSSIONS 5. CONCLUSION 6. ACKNOWLEDGEMENTS Schematic diagram of the NOxdegradation test setup Photocatalysis in Asphalt Pavements NOxconcentration during the first degradation test NOxdegradation analysis scheme Output Removal NOx:760.08 ppb Output NOxconcentration during the second degradation test * Standard cubic centimeters per minute * Standard cubic centimeters per minute