Photocatalytic nano-composite architectural lime mortar for degradation of urban pollutants under solar and visible (interior) light
authors Saeli, M; Tobaldi, DM; Rozman, N; Skapin, AS; Labrincha, JA; Pullar, RC
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords Mortar; Natural hydraulic lime; Photocatalysis; NOx; Titania; Nanocomposite
keywords TITANIUM-DIOXIDE; TIO2 PHOTOCATALYSIS; BUILDING-MATERIALS; OPTICAL-PROPERTIES; AIR; FUNDAMENTALS; CONSTRUCTION; PURIFICATION; NANOPOWDERS; CHEMISTRY
abstract Recent advances in nano-technology and nano-additives can give enhanced properties to natural hydraulic lime (NHL); creating a multifunctional material. We have prepared a novel nanocomposite, made of a commercial mortar with 1 wt% and 5 wt% added titania nanoparticles (NPs). These TiO2 NPs are themselves doped with 1 mol% silver, to give the material enhanced photocatalytic and antimicrobial properties. The Ag-doped TiO2 NPs were made "from a simple, costs effective, aqueous green nanosynthesis process, and the end material only contains 0.01-0.05% Ag. As this mortar is intended to both combat atmospheric pollution, and create more durable/lower maintenance building fa ades (plastering and finishing) by limiting attack from microorganisms and pollutants, its photocatalytic anti-pollution activity under solar and visible (no UV) light for nitrous oxide (NOx) and volatile organic compound (VOC) removal was studied. The addition of dopants did not significantly alter the physical properties or curing of the mortar, while it showed excellent photocatalytic activity under sunlight, The mortars with only 1 and 5 wt% additives degraded 10.6% and 21% NO after 45 mins, respectively, comparing well to a value of 50% for a pure TiO2/Ag+ sample. They also degraded VOCs under visible light, of the kind used for lighting inside buildings, with no UV component. As the NPs are contained in the whole of the mortar layer, not just as a coating, if the surface is chipped or damaged this mortar will not loose its photocatalytic capabilities. (C) 2017 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0950-0618
isbn 1879-0526
year published 2017
volume 152
beginning page 206
ending page 213
digital object identifier (doi) 10.1016/j.conbuildmat.2017.06.167
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000411545600019
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journal impact factor 3.485
5 year journal impact factor 4.039
category normalized journal impact factor percentile 83.796
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