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TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
44954 46386 2015 10 PDF Available
Title
TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties
Abstract

•TiO2-Cem and TiO2–SiO2-Cem mortars showed RhB photodegradation conversions above 80%.•TiO2-Cem mortars presented NOx photodegradation over 50% of initial concentration.•The insertion of SiO2 slowed down initial photodegradation evolution.•TiO2 home-made, TEA, coating was the most homogeneous, adhered and stable.

An increasingly known application of nanomaterials in the construction industry is related to the photoactivity ability of semiconductors, where nano-anatase TiO2 is perhaps the most well-known photocatalytic semiconductor and one which possesses a strong oxidizing capability. To analyze the photo-efficiency of four TiO2 coatings and the effect of SiO2 interlayer on the mechanic and photocatalytic activity in Rhodamine B (RhB) and NOx photodegradation, two photocatalytic cement series have been prepared. First, cement mortar was coated with three commercial TiO2 suspensions (GG1, GC7 and CG13) and a home-made titania sol–gel (TEA), and secondly an insertion of a SiO2 layer was applied on cement surface before spraying the TiO2 layer.All studied TiO2-cements exhibited a significant RhB and NOx photodegradation, arising almost total RhB molar conversions, and upper 53% for NOx photo-oxidation respectively. Nevertheless, although SiO2 layer deposited in between mortar and TiO2-cement did not stabilize the commercial TiO2 coatings, a good adhesion was observed when silica was applied joint to the home-made titania gel (TEA), probably as a consequence of the interactions encountered between SiO2 and TiO2 gels. CG7-Si-Cem exhibited high rate at shorter irradiation times, but TEA-Cem and TEA-Si-Cem can be considered as very interesting and potential photocatalytic mortars due to useful mechanical properties, with a very good coatings adhesion that provides promising outdoor use, and good photo-efficiencies in RhB and NOx photo-oxidation.

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Keywords
Photocatalysis; TiO2; SiO2; NOx; RhB
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TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 155–164
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us