Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval
TiO2-based photocatalysis under visible light is an attractive way to abate air pollutants. Moreover, developing photocatalytic materials on a large-scale requires safe and low-cost precursors. Both high-performance TiO2 nanopowders and visible-light active noble metals do not match these requiremen...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-09-01
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| Series: | Nanomaterials |
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| Online Access: | http://www.mdpi.com/2079-4991/8/9/686 |
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| author | Marta Stucchi Daria C. Boffito Eleonora Pargoletti Giuseppina Cerrato Claudia L. Bianchi Giuseppe Cappelletti |
| author_facet | Marta Stucchi Daria C. Boffito Eleonora Pargoletti Giuseppina Cerrato Claudia L. Bianchi Giuseppe Cappelletti |
| author_sort | Marta Stucchi |
| collection | DOAJ |
| description | TiO2-based photocatalysis under visible light is an attractive way to abate air pollutants. Moreover, developing photocatalytic materials on a large-scale requires safe and low-cost precursors. Both high-performance TiO2 nanopowders and visible-light active noble metals do not match these requirements. Here, we report the design of novel Mn-decorated micrometric TiO2 particles. Pigmentary TiO2 replaced unsafe nano-TiO2 and firmly supported MnOx particles. Mn replaced noble metals such as Au or Ag, opening the way for the development of lower cost catalysts. Varying Mn loading or pH during the impregnation affected the final activity, thus giving important information to optimize the synthesis. Photocatalytic activity screening occurred on the gas-phase degradation of ethanol as a reference molecule, both under ultraviolet (UV) (6 h) and Light Emitting Diode (LED) (24 h) irradiation. Mn-doped TiO2 reached a maximum ethanol degradation of 35% under visible light after 24 h for the sample containing 20% of Mn. Also, we found that an acidic pH increased both ethanol degradation and mineralization to CO2, while an alkaline pH drastically slowed down the reaction. A strict correlation between photocatalytic results and physico-chemical characterizations of the synthesized powders were drawn. |
| first_indexed | 2024-12-21T02:54:34Z |
| format | Article |
| id | doaj.art-870b4a0b1f6a48e1b6606b67a9a57a36 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-21T02:54:34Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-870b4a0b1f6a48e1b6606b67a9a57a362022-12-21T19:18:22ZengMDPI AGNanomaterials2079-49912018-09-018968610.3390/nano8090686nano8090686Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible PhotoremovalMarta Stucchi0Daria C. Boffito1Eleonora Pargoletti2Giuseppina Cerrato3Claudia L. Bianchi4Giuseppe Cappelletti5Chemistry Department, University of Milan, via Golgi 19, 20133 Milano, ItalyChemical Engineering Department, Ècole Polytechnique Montréal, Pavillon Principal, Centre-Ville, Montréal, QC H3C 3A4, CanadaChemistry Department, University of Milan, via Golgi 19, 20133 Milano, ItalyChemistry Department & NIS Centre, University of Turin, via Pietro Giuria 7, 10125 Turin, ItalyChemistry Department, University of Milan, via Golgi 19, 20133 Milano, ItalyChemistry Department, University of Milan, via Golgi 19, 20133 Milano, ItalyTiO2-based photocatalysis under visible light is an attractive way to abate air pollutants. Moreover, developing photocatalytic materials on a large-scale requires safe and low-cost precursors. Both high-performance TiO2 nanopowders and visible-light active noble metals do not match these requirements. Here, we report the design of novel Mn-decorated micrometric TiO2 particles. Pigmentary TiO2 replaced unsafe nano-TiO2 and firmly supported MnOx particles. Mn replaced noble metals such as Au or Ag, opening the way for the development of lower cost catalysts. Varying Mn loading or pH during the impregnation affected the final activity, thus giving important information to optimize the synthesis. Photocatalytic activity screening occurred on the gas-phase degradation of ethanol as a reference molecule, both under ultraviolet (UV) (6 h) and Light Emitting Diode (LED) (24 h) irradiation. Mn-doped TiO2 reached a maximum ethanol degradation of 35% under visible light after 24 h for the sample containing 20% of Mn. Also, we found that an acidic pH increased both ethanol degradation and mineralization to CO2, while an alkaline pH drastically slowed down the reaction. A strict correlation between photocatalytic results and physico-chemical characterizations of the synthesized powders were drawn.http://www.mdpi.com/2079-4991/8/9/686micrometric TiO2Mn decorationvisible light photocatalysisimpregnation pHsurface hydroxyl groups |
| spellingShingle | Marta Stucchi Daria C. Boffito Eleonora Pargoletti Giuseppina Cerrato Claudia L. Bianchi Giuseppe Cappelletti Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval Nanomaterials micrometric TiO2 Mn decoration visible light photocatalysis impregnation pH surface hydroxyl groups |
| title | Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval |
| title_full | Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval |
| title_fullStr | Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval |
| title_full_unstemmed | Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval |
| title_short | Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval |
| title_sort | nano mno2 decoration of tio2 microparticles to promote gaseous ethanol visible photoremoval |
| topic | micrometric TiO2 Mn decoration visible light photocatalysis impregnation pH surface hydroxyl groups |
| url | http://www.mdpi.com/2079-4991/8/9/686 |
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