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Photocatalytic Activity of TiO2/AuNRs–SiO2 Nanocomposites Applied to Building Materials

1
CNR-IPCF, Istituto per i Processi Chimici e Fisici, U.O.S. Bari, c/o Dip. Chimica Via Orabona 4, 70126 Bari, Italy
2
TEP-243 Nanomaterials Group, Departmento de Química Fisica, Facultad de Ciencias, Campus Río San Pedro, Universidad de Cádiz, 11510 Puerto Real, Spain
3
CNR-IC, Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, v. Amendola 122/O, 70126 Bari, Italy
*
Authors to whom correspondence should be addressed.
Coatings 2018, 8(9), 296; https://doi.org/10.3390/coatings8090296
Received: 4 July 2018 / Revised: 10 August 2018 / Accepted: 17 August 2018 / Published: 22 August 2018
(This article belongs to the Special Issue Communications from TechnoHeritage 2017)
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Abstract

In this work, the self-cleaning and photocatalytic properties of mesoporous TiO2/AuNRs-SiO2 composites (namely UCA–TiO2Au) prepared by a simple and low-cost technique were investigated toward application in building materials. Mesoporous photocatalytic nanocomposites coating the surface of stone and other building materials are a very promising approach to address relevant questions connected with the increasing atmospheric pollution. We tested three types of preformed TiO2/AuNRs nanostructures in order to evaluate the effect of AuNRs on the photocatalytic activity of resulting coatings deposited on the surface of a popular building limestone. The resulting nanocomposites provide crack-free surface coatings on limestone, effective adhesion, improve the stone mechanical properties and impart hydrophobic and self-cleaning properties. Photocatalytic characterization involved the degradation of a target compound (Methylene blue; MB) under direct exposure to simulated solar light using TiO2 P25 Evonik (TiO2 P25) as a reference material. Moreover, these coatings upon irradiation by simulated solar light were successfully employed for the photocatalytic oxidation of carbon soot. The experimental results revealed that UCA–TiO2Au samples are the best performing coating in both MB bleaching and soot degradation. View Full-Text
Keywords: photocatalytic activity; self-cleaning; nanocomposites; silica matrix; gold modified titanium dioxide; building materials photocatalytic activity; self-cleaning; nanocomposites; silica matrix; gold modified titanium dioxide; building materials
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Truppi, A.; Luna, M.; Petronella, F.; Falcicchio, A.; Giannini, C.; Comparelli, R.; Mosquera, M.J. Photocatalytic Activity of TiO2/AuNRs–SiO2 Nanocomposites Applied to Building Materials. Coatings 2018, 8, 296.

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