Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties / Aurora Petica in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p.1153-1163 Titre : Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties Type de document : texte imprimé Auteurs : Aurora Petica, Auteur ; Carmen Gaidau, Auteur ; Madalina Ignat, Auteur ; Claudiu Sendrea, Auteur ; Liana Anicai, Auteur Année de publication : 2015 Article en page(s) : p.1153-1163 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Cuirs et peaux -- Finition Dioxyde de titane Hydrophilie Nanoparticules Photocatalyse Revêtement auto-nettoyant Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2 nanoparticles (TiO2NPs) doped with N and Fe, exhibiting improved photocatalytic activity in the visible light region, were prepared and then applied onto leather surfaces. Diffuse reflectance spectra measurements evidenced the shifting of the absorption peak toward visible region and the enlargement of absorption band (the so-called “tail” of the band). Absorbance spectra for a 20 ppm methylene blue (MB) solution, in the presence of 0.1% (wt%) doped TiO2NPs after 1 h under visible light irradiation, showed the high efficiency of the doping. Doped TiO2NPs were embedded in composites material based on acrylic binder, nitrocellulose lacquer, and pigmented paste and were used for leather surface finishing. Self-cleaning properties were confirmed by spectrophotometrical measurements and CIELab color coordinates recording for the degradation of MB spots applied to the treated leather surface exposed to UVA (λ = 365 nm) and visible light irradiation. Leather treated with Fe–N co-doped TiO2NPs presents the highest activity for MB spot degradation under visible light irradiation. The photographic images of MB dye spots and ball pen ink lines indicate a complete degradation after 30 h of exposure to visible light. Water contact angle measurements in dynamic conditions evidenced the photo-induced hydrophilicity process on functionalized leather surface, supporting the degradation phenomena through water and oxidative species generation. Note de contenu : - EXPERIMENTAL : Synthesis of doped titania nanopowders - Leather surface treatment - Characterization methods - RESULTS AND DISCUSSION : Structural and morphological characterization - Optical properties of doped TiO2 nanopowders - Photocatalytic activity of the doped TiO2PNs - Self-cleaning characterization of the treated leather DOI : 10.1007/s11998-015-9711-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9711-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24973 [article]

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