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Nanomaterials 2018, 8(9), 686; https://doi.org/10.3390/nano8090686

Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval

1
Chemistry Department, University of Milan, via Golgi 19, 20133 Milano, Italy
2
Chemical Engineering Department, Ècole Polytechnique Montréal, Pavillon Principal, Centre-Ville, Montréal, QC H3C 3A4, Canada
3
National Consortium for Materials Science and Technology (INSTM), via Giusti 9, 50121 Florence, Italy
4
Chemistry Department & NIS Centre, University of Turin, via Pietro Giuria 7, 10125 Turin, Italy
*
Author to whom correspondence should be addressed.
Received: 11 August 2018 / Revised: 27 August 2018 / Accepted: 31 August 2018 / Published: 3 September 2018
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Abstract

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. View Full-Text
Keywords: micrometric TiO2; Mn decoration; visible light photocatalysis; impregnation pH; surface hydroxyl groups micrometric TiO2; Mn decoration; visible light photocatalysis; impregnation pH; surface hydroxyl groups
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Stucchi, M.; Boffito, D.C.; Pargoletti, E.; Cerrato, G.; Bianchi, C.L.; Cappelletti, G. Nano-MnO2 Decoration of TiO2 Microparticles to Promote Gaseous Ethanol Visible Photoremoval. Nanomaterials 2018, 8, 686.

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