Catalytic Ozonation Using Edge-Hydroxylated Graphite-Based Materials

"This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry & Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acssuschemeng.9b04646"[EN] This work reports the catalytic ozonation activity of high surface area graphite materials selectively functionalized at the edges with hydroxyl groups. The graphite-based catalyst shows higher activity than the parent graphite, commercial activated carbon, commercial multiwall carbon nanotubes, commercial diamond nanoparticles, graphene oxide, or reduced graphene oxide. Importantly, the catalytic activity of the graphite-based material is also higher than those of benchmark ozonation catalysts such as Co3O4 or Fe2O3. The graphite catalyst was reused up to 10 times with only a minor decrease in the catalytic activity. Catalytic activation of O-3 leads to the generation of hydroperoxide radicals and O-1(2). These results have been interpreted as derived from the combination of a suitable work function and the presence of phenolic/semiquinone-like redox pairs, as well as high dispersibility in water due to the presence of -OH groups. This work highlights the possibility of engineering active and stable carbocatalysts for reactions typically promoted by transition metals.Financial support by the Spanish Ministry of Science and Innovation (Severn Ochoa and RTI2018-098237-CO21) and Generalitat Valenciana (Prometeo 2017/083) is gratefully acknowledged. S.N. is thankful for financial support from the Fundacion Ramon Areces (XVIII Concurso Nacional para la Adjudication de Ayudas a la Investigacion en Ciencias de la Vida y de la Materia, 2016), Ministerio de Ciencia, Innovacion y Universidades RTI2018-099482-A-I00 project and Generalitat Valenciana grupos de investigacion consolidables 2019 (ref: AICO/2019/214) project.Bernat-Quesada, F.; Espinosa-López, JC.; Barbera, V.; Alvaro Rodríguez, MM.; Galimberti, M.; Navalón Oltra, S.; García Gómez, H. (2019). Catalytic Ozonation Using Edge-Hydroxylated Graphite-Based Materials. ACS Sustainable Chemistry & Engineering. 7(20):17443-17452. https://doi.org/10.1021/acssuschemeng.9b04646S174431745272

Catalytic Ozonation Using Edge-Hydroxylated Graphite-Based Materials

reserved7siThis work reports the catalytic ozonation activity of high surface area graphite materials selectively functionalized at the edges with hydroxyl groups. The graphite-based catalyst shows higher activity than the parent graphite, commercial activated carbon, commercial multiwall carbon nanotubes, commercial diamond nanoparticles, graphene oxide, or reduced graphene oxide. Importantly, the catalytic activity of the graphite-based material is also higher than those of benchmark ozonation catalysts such as Co3O4 or Fe2O3. The graphite catalyst was reused up to 10 times with only a minor decrease in the catalytic activity. Catalytic activation of O3 leads to the generation of hydroperoxide radicals and 1O2. These results have been interpreted as derived from the combination of a suitable work function and the presence of phenolic/semiquinone-like redox pairs, as well as high dispersibility in water due to the presence of −OH groups. This work highlights the possibility of engineering active and stable carbocatalysts for reactions typically promoted by transition metals.mixedBernat-Quesada F.; Espinosa J.C.; Barbera V.; Alvaro M.; Galimberti M.; Navalon S.; Garcia H.Bernat-Quesada, F.; Espinosa, J. C.; Barbera, V.; Alvaro, M.; Galimberti, M.; Navalon, S.; Garcia, H