TY - JOUR KW - Soot KW - Aging KW - Photocatalytic membranes KW - Cool wall KW - ISO Standard 22197-1 KW - De-NOx AU - Xiaochen Tang AU - Olivier Rosseler AU - Sharon S Chen AU - Sébastien Houzé de l’Aulnoit AU - Michael J Lussier AU - Jiachen Zhang AU - George Ban Weiss AU - Haley E Gilbert AU - Ronnen M Levinson AU - Hugo Destaillats AB -

Photocatalytic self-cleaning “cool” roofs and walls can maintain high albedos, saving building cooling energy, reducing peak power demand, and mitigating the urban heat island effect. Other environmental benefits result from their de-polluting properties. Specimens from two different photocatalytic architectural membranes and a non-photocatalytic control were exposed alongside vertically, facing west, for two years in three California sites, and retrieved quarterly for testing. Photocatalytic materials showed excellent self-cleaning performance, retaining albedos of 0.74 – 0.75. By contrast, the control material exhibited an albedo loss of up to 0.10 units, with appreciable soiling observed by scanning electron microscopy. De-pollution capacity was assessed by quantifying NO removal and NOx deposition rates at 60 °C. Efficacy varied with exposure location, weather conditions, and the nature of the photocatalytic material. Seasonal effects were observed, with partial inhibition during the dry season and reactivation during the rainy season.

BT - Applied Catalysis B: Environmental DA - 02/2020 DO - https://doi.org/10.1016/j.apcatb.2020.119260 LA - eng N2 -

Photocatalytic self-cleaning “cool” roofs and walls can maintain high albedos, saving building cooling energy, reducing peak power demand, and mitigating the urban heat island effect. Other environmental benefits result from their de-polluting properties. Specimens from two different photocatalytic architectural membranes and a non-photocatalytic control were exposed alongside vertically, facing west, for two years in three California sites, and retrieved quarterly for testing. Photocatalytic materials showed excellent self-cleaning performance, retaining albedos of 0.74 – 0.75. By contrast, the control material exhibited an albedo loss of up to 0.10 units, with appreciable soiling observed by scanning electron microscopy. De-pollution capacity was assessed by quantifying NO removal and NOx deposition rates at 60 °C. Efficacy varied with exposure location, weather conditions, and the nature of the photocatalytic material. Seasonal effects were observed, with partial inhibition during the dry season and reactivation during the rainy season.

PY - 2021 T2 - Applied Catalysis B: Environmental TI - Self-cleaning and de-pollution efficacies of photocatalytic architectural membranes ER -