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The kinetics of the heterogeneous reaction between gaseous HCHO and TiO 2 /SiO 2 mineral coatings were investigated using a coated-wall flow tube to mimic HCHO loss on mineral aerosol and TiO 2 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 ...
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