Influence of Dust and Oil Accumulation on Effectiveness of Photocatalytic Concrete Surfaces

AbstractThe day-to-day negative effect of contaminating substances on the NOx removal effectiveness of photocatalytic surfaces and their recovery capacity after undergoing cleansing is of real academic and practical interest. This paper analyzes the NOx removal effectiveness of two different types o...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 2017-09, Vol.143 (9)
Main Authors: Etxeberria, Miren, Guo, Ming-Zhi, Maury-Ramirez, Anibal, Poon, Chi Sun
Format: Article
Language:English
Subjects:
Aspectes ambientals
Cleansing
Concrete
Concrete surface
Concretes
Dust
Dust accumulation
Enginyeria civil
Formigó
Impregnation
Materials i estructures
Materials i estructures de formigó
Nano-TiO2
Nanostructure
NOx removal
Oil impregnation
Photocatalysis
Photocatalytic
Recovery
Solvents
Surfaces
Technical Papers
Àrees temàtiques de la UPC
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Summary:AbstractThe day-to-day negative effect of contaminating substances on the NOx removal effectiveness of photocatalytic surfaces and their recovery capacity after undergoing cleansing is of real academic and practical interest. This paper analyzes the NOx removal effectiveness of two different types of photocatalytic concrete surface layers incorporating nano-TiO2 particles. Both types of surfaces are examined before and after being subjected to dust accumulation and oil impregnation. The recovery of their NOx removal capacity after undergoing various cleansing processes is also evaluated. The results are compared to those of their respective reference samples. The results show that the high NOx removal capacity of the spray-coated samples is partially maintained even after a high concentration of dust accumulation. However, the water-cleansing process employed is sufficient to recover the lost NOx removal capacity. It is also discovered that the nano-TiO2 particles lose nearly all their photocatalytic capacity after being subjected to oil impregnation, and that the cleansing processes, either by an alkaline detergent or using an n-hexane solvent, fails to recover the initial NOx removal capacity.
ISSN:0733-9372
1943-7870
1943-7870
DOI:10.1061/(ASCE)EE.1943-7870.0001239