Kinetics of the tropospheric formaldehyde loss onto mineral dust and urban surfaces |
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| Authors: | Maria Sassine Laurence Burel Barbara D'Anna Christian George |
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| Affiliation: | 1. Université de Lyon, Lyon F-69626, France;2. CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l''environnement de Lyon, Villeurbanne F-69626, France;1. Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo (IAG/USP), Brazil;2. Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo (IQ/USP), Brazil;1. Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States;2. Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States;3. Division of Business, Engineering, and Information Sciences and Technology, Pennsylvania State University, Altoona, PA, United States;1. INFIQC (CONICET – UNC), Ciudad Universitaria, X5000HUA, Córdoba, Argentina;2. Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina;3. Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina;4. Centro de Investigación y Transferencia en Ingeniería Química Ambiental (CIQA), Departamento de Ingeniería Química, Facultad Regional Córdoba, Universidad Tecnológica Nacional (UTN), Maestro López esq. Cruz Roja Argentina, 5016, Córdoba, Argentina;1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong 266033, PR China;2. Qingdao Environmental Monitoring Center, Yan’an Yi Road 39, Qingdao, Shandong 266003, PR China;3. College of Chemistry and Environmental Engineering, Hubei Normal University, Cihu Road 11, Huangshi, Hubei 435002, PR China;4. Key Laboratory of Photoinduced Functional Materials, Mianyang Normal University, Mianyang 621000, PR China |
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| Abstract: | The kinetics of the heterogeneous reaction between gaseous HCHO and TiO2/SiO2 mineral coatings were investigated using a coated-wall flow tube to mimic HCHO loss on mineral aerosol and TiO2 coated depolluting urban surfaces. The measured uptake kinetics were strongly enhanced when the flow tube was irradiated with 340–420 nm UV light with an irradiance of 1.45 mW cm?2. The associated BET uptake coefficients ranged from (3.00 ± 0.45) × 10?9 to (2.26 ± 0.34) × 10?6 and were strongly dependent on HCHO initial concentration, relative humidity, temperature, and TiO2 content in the mineral coating, which ranged from 3.5 to 32.5 ppbv, 6–70%, 278–303 K, and 1–100 %wt, respectively. The measured kinetics were well described using a Langmuir–Hinshelwood type formalism. The estimated uptake coefficients were used to discuss the importance of heterogeneous HCHO surface loss, in terms of deposition lifetimes, as compared to major homogeneous gas-phase losses such as OH reaction and photolysis. It is found that deposition may compete with gas-phase removal of HCHO in a dense urban environment if more than 10% of the urban surface is covered with TiO2 treated material. |
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