On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection
| Autor: | Maria Vittoria Diamanti, Maryam Mokhtarifar, MariaPia Pedeferri, Mojtaba Bagherzadeh, Marco Ormellese, Reyhaneh Kaveh |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Anatase
Materials science γ-Fe2O3 Composite number Oxide Nanoparticle transparent coating reduced graphene oxide law.invention chemistry.chemical_compound law Superhydrophilicity TiO2 photocatalyst discoloration Materials Chemistry Data_FILES TiO2 ComputingMethodologies_COMPUTERGRAPHICS Graphene photocatalyst Surfaces and Interfaces Surfaces Coatings and Films chemistry Chemical engineering lcsh:TA1-2040 Photocatalysis Wetting lcsh:Engineering (General). Civil engineering (General) self-cleaning |
| Zdroj: | Coatings Volume 10 Issue 10 Coatings, Vol 10, Iss 933, p 933 (2020) |
| ISSN: | 2079-6412 |
| DOI: | 10.3390/coatings10100933 |
| Popis: | The durability of novel metallic artifacts and buildings is an open issue, and the role of smart protecting coatings in extending these artifacts&rsquo lifetimes is crucial. In this paper, the role of &gamma Fe2O3 nanoparticles and reduced graphene oxide (rGO) nanosheets on enhancing the self-cleaning properties of composite TiO2 films and reducing metal alterations due to contact with acid rain and pollutants is investigated. The photocatalytic assessment of the TiO2 based films indicates that there are optimum contents for &gamma Fe2O3 and rGO, which confer the film lower bandgap and tune the TiO2 anatase/rutile ratio. By adding a proper content of &gamma Fe2O3, wettability is reduced both in dark and under illumination, which could be related to higher roughness. &gamma Fe2O3 overloading causes increasing crack density and eventually a fully cracked structure. Adding an appropriate amount of rGO causes a sharp increase in roughness, due to the stacking of rGO nanosheets, while simultaneously avoiding cracking. At higher contents of rGO, wettability further decreases due to higher amounts of hydroxyl groups bound onto rGO also in this case, overloading causes film cracking. Evaluation of self-cleaning performance and discoloration resistance under soiling and acid rain simulated tests demonstrates that proper loadings of &gamma Fe2O3 and rGO present higher efficiency thanks to higher superhydrophilic tendency and higher photocatalytic activities, as well as an efficient barrier effect. |
| Databáze: | OpenAIRE |
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