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Ag–SiO2–TiO2 nanocomposite coatings with enhanced photoactivity for self-cleaning application on building materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
44953 46386 2015 11 PDF Available
Title
Ag–SiO2–TiO2 nanocomposite coatings with enhanced photoactivity for self-cleaning application on building materials
Abstract

•Ag–TiO2–SiO2 photocatalysts are easily applied as sols to form coatings on stone.•N-octylamine acts as dispersant, catalyzer, pore coarsener and reducing agent.•Ag NPs (2–5 nm size) improve the photoactivity of TiO2–SiO2 nanocomposites.•The coatings show good adhesion and preserve stone esthetics.

The synthesis of improved photocatalysts capable of removing pollutants deposited on building surfaces is an important challenge for researchers nowadays. By using a simple and low-cost process we have synthesized mesoporous Ag–TiO2–SiO2 photocatalytic coatings that meet the requirements of outdoor application. These are new materials designed to give to the building material improved self-cleaning properties.We have varied the loading of TiO2 and Ag nanoparticles in order to investigate their effect on the photocatalytic activity of our nanocomposites. We find that the integration of higher Ag loadings in a TiO2–SiO2 network (10% w/w) significantly increase the photoactivity of the coating containing 1% (w/v) TiO2 due to the improved absorption of visible light and higher surface area of the photocatalyst. For higher TiO2 contents (4%) there is an increase in photoactivity for 1% (w/v) Ag loading. Higher amounts of Ag loadings (5% w/w) generate an undesired color change on stone or inhibit the sol–gel transition of the coatings (10% w/w).

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Keywords
Photocatalysis; Mesoporous Ag-SiO2-TiO2 photocatalyst; Ag nanoparticles; Surface plasmon resonance; Self-cleaning
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Ag–SiO2–TiO2 nanocomposite coatings with enhanced photoactivity for self-cleaning application on building materials
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 144–154
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