Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials
The photocatalytic oxidation of biomass-derived building blocks such as 5-hydroxymethylfurfural (HMF) is a promising reaction for obtaining valuable chemicals and the efficient long-term storage of solar radiation. In this work, we developed innovative TiO<sub>2</sub>-based materials cap...
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MDPI AG
2020-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/25/22/5225 |
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| author | Alessandro Allegri Valeriia Maslova Magda Blosi Anna Luisa Costa Simona Ortelli Francesco Basile Stefania Albonetti |
| author_facet | Alessandro Allegri Valeriia Maslova Magda Blosi Anna Luisa Costa Simona Ortelli Francesco Basile Stefania Albonetti |
| author_sort | Alessandro Allegri |
| collection | DOAJ |
| description | The photocatalytic oxidation of biomass-derived building blocks such as 5-hydroxymethylfurfural (HMF) is a promising reaction for obtaining valuable chemicals and the efficient long-term storage of solar radiation. In this work, we developed innovative TiO<sub>2</sub>-based materials capable of base-free HMF photo-oxidation in water using simulated solar irradiation. The materials were prepared by combining microemulsion and spray-freeze drying (SFD), resulting in highly porous systems with a large surface area. The effect of titania/silica composition and the presence of gold-copper alloy nanoparticles on the properties of materials as well as photocatalytic performance were evaluated. Among the lab-synthesized photocatalysts, Ti<sub>15</sub>Si<sub>85</sub> SFD and Au<sub>3</sub>Cu<sub>1</sub>/Ti<sub>15</sub>Si<sub>85</sub> SFD achieved the higher conversions, while the best selectivity was observed for Au<sub>3</sub>Cu<sub>1</sub>/Ti<sub>15</sub>Si<sub>85</sub> SFD. The tests with radical scavengers for both TiO<sub>2</sub>-m and Au<sub>3</sub>Cu<sub>1</sub>/Ti<sub>15</sub>Si<sub>85</sub> SFD suggested that primary species responsible for the selective photo-oxidation of HMF are photo-generated electrons and/or superoxide radicals. |
| first_indexed | 2024-03-10T14:58:58Z |
| format | Article |
| id | doaj.art-8941d26e6fe64211bebf3770e1285ca8 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T14:58:58Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-8941d26e6fe64211bebf3770e1285ca82023-11-20T20:23:04ZengMDPI AGMolecules1420-30492020-11-012522522510.3390/molecules25225225Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based MaterialsAlessandro Allegri0Valeriia Maslova1Magda Blosi2Anna Luisa Costa3Simona Ortelli4Francesco Basile5Stefania Albonetti6Dip. Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136 Bologna (BO), ItalyDip. Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136 Bologna (BO), ItalyISTEC-CNR, Institute of Science and Technology for Ceramics, National Research Council, Via Granarolo 64, 48018 Faenza, ItalyISTEC-CNR, Institute of Science and Technology for Ceramics, National Research Council, Via Granarolo 64, 48018 Faenza, ItalyISTEC-CNR, Institute of Science and Technology for Ceramics, National Research Council, Via Granarolo 64, 48018 Faenza, ItalyDip. Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136 Bologna (BO), ItalyDip. Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136 Bologna (BO), ItalyThe photocatalytic oxidation of biomass-derived building blocks such as 5-hydroxymethylfurfural (HMF) is a promising reaction for obtaining valuable chemicals and the efficient long-term storage of solar radiation. In this work, we developed innovative TiO<sub>2</sub>-based materials capable of base-free HMF photo-oxidation in water using simulated solar irradiation. The materials were prepared by combining microemulsion and spray-freeze drying (SFD), resulting in highly porous systems with a large surface area. The effect of titania/silica composition and the presence of gold-copper alloy nanoparticles on the properties of materials as well as photocatalytic performance were evaluated. Among the lab-synthesized photocatalysts, Ti<sub>15</sub>Si<sub>85</sub> SFD and Au<sub>3</sub>Cu<sub>1</sub>/Ti<sub>15</sub>Si<sub>85</sub> SFD achieved the higher conversions, while the best selectivity was observed for Au<sub>3</sub>Cu<sub>1</sub>/Ti<sub>15</sub>Si<sub>85</sub> SFD. The tests with radical scavengers for both TiO<sub>2</sub>-m and Au<sub>3</sub>Cu<sub>1</sub>/Ti<sub>15</sub>Si<sub>85</sub> SFD suggested that primary species responsible for the selective photo-oxidation of HMF are photo-generated electrons and/or superoxide radicals.https://www.mdpi.com/1420-3049/25/22/52255-hydroxymethyl furfuralspray-freeze dryingphotocatalysisTiO<sub>2</sub>microemulsion |
| spellingShingle | Alessandro Allegri Valeriia Maslova Magda Blosi Anna Luisa Costa Simona Ortelli Francesco Basile Stefania Albonetti Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials Molecules 5-hydroxymethyl furfural spray-freeze drying photocatalysis TiO<sub>2</sub> microemulsion |
| title | Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials |
| title_full | Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials |
| title_fullStr | Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials |
| title_full_unstemmed | Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials |
| title_short | Photocatalytic Oxidation of HMF under Solar Irradiation: Coupling of Microemulsion and Lyophilization to Obtain Innovative TiO<sub>2</sub>-Based Materials |
| title_sort | photocatalytic oxidation of hmf under solar irradiation coupling of microemulsion and lyophilization to obtain innovative tio sub 2 sub based materials |
| topic | 5-hydroxymethyl furfural spray-freeze drying photocatalysis TiO<sub>2</sub> microemulsion |
| url | https://www.mdpi.com/1420-3049/25/22/5225 |
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