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Synthesis and characterization of nanocrystalline TiO2 with application as photoactive coating on stones

Bergamonti, Laura ; Alfieri, Ilaria ; Franzò, Marco ; Lorenzi, Andrea ; Montenero, Angelo ; Predieri, Giovanni ; Raganato, Marina ; Calia, Angela ; Lazzarini, Laura ; Bersani, Danilo ; Lottici, Pier Paolo

Environmental science and pollution research international, December 2014, Vol.21(23), pp.13264-77 [Tạp chí có phản biện]

E-ISSN: 1614-7499 ; PMID: 24057959 Version:1 ; DOI: 10.1007/s11356-013-2136-5

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  • Nhan đề:
    Synthesis and characterization of nanocrystalline TiO2 with application as photoactive coating on stones
  • Tác giả: Bergamonti, Laura ; Alfieri, Ilaria ; Franzò, Marco ; Lorenzi, Andrea ; Montenero, Angelo ; Predieri, Giovanni ; Raganato, Marina ; Calia, Angela ; Lazzarini, Laura ; Bersani, Danilo ; Lottici, Pier Paolo
  • Chủ đề: Construction Materials ; Nanoparticles -- Chemistry ; Titanium -- Chemistry
  • Là 1 phần của: Environmental science and pollution research international, December 2014, Vol.21(23), pp.13264-77
  • Mô tả: Self-cleaning photocatalytic coatings for biocalcarenite stones, based on TiO2 nanoparticles obtained by sol-gel processes at different pH values and also adding gold particles, have been investigated. The selected test material is a biocalcarenite named "pietra di Lecce" (Lecce stone), outcropping in Southern Italy. Scanning electron microscopy with energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, and Raman investigations were carried out to characterize the TiO2 nanoparticles and coatings. Nanocrystalline anatase and, to a lesser extent, brookite phases are obtained. Photocatalytic activity of the TiO2 sols and of the coatings on "pietra di Lecce" was assessed under ultraviolet irradiation, monitoring methyl orange (MeO) dye degradation as a function of time. To evaluate the harmlessness of the treatment, colorimetric tests and water absorption by capillarity were performed. The results show good photodegradation rates for titania nanosols, particularly when putting in Au particles, whereas a satisfactory chromatic compatibility between the sol and the surface of the calcarenite is found only without Au addition. Sols of nanocrystalline titania at different pH values and with Au particles were prepared and characterized. Satisfactory photodegradation of MeO by the sols in solution and on calcarenite-coated surfaces is obtained. The addition of Au particles improves the photodegradation activity but gives poor chromatic results on "pietra di Lecce."
  • Ngôn ngữ: English
  • Số nhận dạng: E-ISSN: 1614-7499 ; PMID: 24057959 Version:1 ; DOI: 10.1007/s11356-013-2136-5

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