Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity
Coatings of anatase (TiO2), hematite (Fe2O3), or cobalt spinel (Co3O4) on ceramic glazes with a metallized effect and photocatalytic activity were prepared by depositing Sol–Gel inks made from metal salts dissolved in a polyol medium, applied via conventional screen printing, and fired at...
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Academia.edu Journals
2024-10-01
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| author | Guillermo Monrós Carolina Delgado José Antonio Badenes Guillem Monrós-Andreu Mario Llusar |
| author_facet | Guillermo Monrós Carolina Delgado José Antonio Badenes Guillem Monrós-Andreu Mario Llusar |
| author_sort | Guillermo Monrós |
| collection | DOAJ |
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Coatings of anatase (TiO2), hematite (Fe2O3), or cobalt spinel (Co3O4) on ceramic glazes with a metallized effect and photocatalytic activity were prepared by depositing Sol–Gel inks made from metal salts dissolved in a polyol medium, applied via conventional screen printing, and fired at temperatures around 800–900°C. A red–yellow color layer (L*a*b*= 84/11/21) was obtained in the case of Fe2O3, a dark greenish-yellow color (L*a*b*= 72/–12/11) for Co3O4, and a metallic gray color for TiO2 (L*a*b*= 97/–1/2) with a metallic luster appearance. Higher gloss was achieved for the TiO2 coatings at the optimal firing temperature. The microstructure of the layers, studied by grazing incidence X-ray diffraction (GIXRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and atomic force microscopy (AFM), shows that the heterogeneous nucleation of oxides from the inks supposes the formation of many nanocrystals that form clusters, also of nanometric size, growing parallel to each other and normal to the surface, following a film–glaze interaction model of nucleation, growth, and dissolution. The use of photocatalytic layers grown on the glaze facilitates the recovery of the photocatalyst, extending its lifespan and facilitating reuse tasks. The photodegradation test carried out with glazed samples on Orange II solution shows excellent photocatalytic activity in the case of TiO2 samples, with a half-life period (t1/2= 34.53 min for the optimal sample), comparable to P25 from Evonik used as reference powder. Fe2O3 coatings show moderate photocatalytic activity, with a half-life period of 146 minutes for the optimal sample. |
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| institution | Kabale University |
| issn | 2997-2027 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Academia.edu Journals |
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| series | Academia Materials Science |
| spelling | doaj-art-d6565ee3bdc544c28ea49ab7cab515eb2025-02-10T22:57:32ZengAcademia.edu JournalsAcademia Materials Science2997-20272024-10-011410.20935/AcadMatSci7371Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activityGuillermo Monrós0Carolina Delgado1José Antonio Badenes2Guillem Monrós-Andreu3Mario Llusar4Department of Inorganic and Organic Chemistry, University Jaume I, Castelló, Castelló 12071, Spain.Department of Inorganic and Organic Chemistry, University Jaume I, Castelló, Castelló 12071, Spain.Department of Inorganic and Organic Chemistry, University Jaume I, Castelló, Castelló 12071, Spain.Department of Mechanic Engineering and Construction, University Jaume I, Castelló, Castelló 12071, Spain.Department of Inorganic and Organic Chemistry, University Jaume I, Castelló, Castelló 12071, Spain. Coatings of anatase (TiO2), hematite (Fe2O3), or cobalt spinel (Co3O4) on ceramic glazes with a metallized effect and photocatalytic activity were prepared by depositing Sol–Gel inks made from metal salts dissolved in a polyol medium, applied via conventional screen printing, and fired at temperatures around 800–900°C. A red–yellow color layer (L*a*b*= 84/11/21) was obtained in the case of Fe2O3, a dark greenish-yellow color (L*a*b*= 72/–12/11) for Co3O4, and a metallic gray color for TiO2 (L*a*b*= 97/–1/2) with a metallic luster appearance. Higher gloss was achieved for the TiO2 coatings at the optimal firing temperature. The microstructure of the layers, studied by grazing incidence X-ray diffraction (GIXRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and atomic force microscopy (AFM), shows that the heterogeneous nucleation of oxides from the inks supposes the formation of many nanocrystals that form clusters, also of nanometric size, growing parallel to each other and normal to the surface, following a film–glaze interaction model of nucleation, growth, and dissolution. The use of photocatalytic layers grown on the glaze facilitates the recovery of the photocatalyst, extending its lifespan and facilitating reuse tasks. The photodegradation test carried out with glazed samples on Orange II solution shows excellent photocatalytic activity in the case of TiO2 samples, with a half-life period (t1/2= 34.53 min for the optimal sample), comparable to P25 from Evonik used as reference powder. Fe2O3 coatings show moderate photocatalytic activity, with a half-life period of 146 minutes for the optimal sample.https://www.academia.edu/125169030/Metallised_Sol_Gel_coatings_on_ceramic_glazes_with_photocatalytic_activity |
| spellingShingle | Guillermo Monrós Carolina Delgado José Antonio Badenes Guillem Monrós-Andreu Mario Llusar Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity Academia Materials Science |
| title | Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity |
| title_full | Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity |
| title_fullStr | Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity |
| title_full_unstemmed | Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity |
| title_short | Metallized Sol–Gel coatings on ceramic glazes with photocatalytic activity |
| title_sort | metallized sol gel coatings on ceramic glazes with photocatalytic activity |
| url | https://www.academia.edu/125169030/Metallised_Sol_Gel_coatings_on_ceramic_glazes_with_photocatalytic_activity |
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