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Influence of Hydrogen Annealing on the photocatalytic activity of diamond supported gold catalysts

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Influence of Hydrogen Annealing on the photocatalytic activity of diamond supported gold catalysts

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dc.contributor.author Navalón Oltra, Sergio es_ES
dc.contributor.author Sempere Aracil, David es_ES
dc.contributor.author Alvaro Rodríguez, Maria Mercedes es_ES
dc.contributor.author García Gómez, Hermenegildo es_ES
dc.date.accessioned 2015-06-25T07:00:42Z
dc.date.issued 2013-07-01
dc.identifier.issn 1944-8244
dc.identifier.uri http://hdl.handle.net/10251/52250
dc.description.abstract Fenton-treated diamond nanoparticles have been submitted to hydrogen reduction at 500 °C with the purpose of modifying the nature of the functional groups present on the diamond surface. The nature of the functional groups on the diamond samples was characterized by a combination of spectroscopic and analytical techniques. In particular, Fouriertransformed infrared spectroscopy, temperature-programmed desorption, and X-ray photoelectron spectroscopy (XPS) show the decrease in the population of carboxylic acids, esters, and anhydrides after hydrogen treatment. XPS also shows a decrease on the oxygen content after the hydrogen treatment of the diamond nanoparticles and lower electronegativity of the carbons as assessed by the lower binding energy values. Although Fentontreated diamond colloids in water changes the zeta potential from positive to negative values as a function of the pH, hydrogen annealing and the disappearance of the carboxyl groups determines that the zeta potential of the resulting sample remains positive in the complete pH range. Deposition of gold nanoparticles was carried out by the polyol method consisting on the reduction of HAuCl4 by hot ethylene glycol in the presence of the support. TEM analysis shows a variation of the average gold nanoparticle size that decreases after hydrogen reduction of carboxylic groups and becomes smaller for low gold loadings. The catalytic activity of the diamond supported gold nanoparticles as a function of the surface annealing treatment and gold loading was evaluated for the natural sunlight-assisted peroxidation of phenol by H2O2. It was observed that the most efficient sample was the one having lower gold nanoparticle size that was obtained for diamond samples reduced by hydrogen at 500 °C after the Fenton treatment and having low gold loading (0.05 wt %). Turnover frequencies above 2400 and 940 h−1 were obtained for phenol degradation and H2O2 decomposition, respectively. es_ES
dc.description.sponsorship Financial support by the Spanish Ministry of Economy and Competitiveness (MINECO, Severo Ochoa program and CTQ 2012-32315), Universidad Politecnica de Valencia (PAID-06-11, no 2095) and Generalitat Valenciana (Prometeo 2013/014 and GV/2013/040). en_EN
dc.language Inglés es_ES
dc.publisher American Chemical Society es_ES
dc.relation Spanish Ministry of Economy and Competitiveness (MINECO, Severo Ochoa program and CTQ 2012−32315) es_ES
dc.relation Universidad Politecnica de Valencia (PAID-06 ́ − 11, n° 2095) es_ES
dc.relation Generalitat Valenciana (Prometeo 2013/014 and GV/2013/040) es_ES
dc.relation.ispartof ACS Applied Materials and Interfaces es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Diamond nanoparticles es_ES
dc.subject Gold supported es_ES
dc.subject Natural sunlight irradiation es_ES
dc.subject Heterogeneous photo-Fenton reaction es_ES
dc.subject.classification QUIMICA ORGANICA es_ES
dc.title Influence of Hydrogen Annealing on the photocatalytic activity of diamond supported gold catalysts es_ES
dc.type Artículo es_ES
dc.embargo.lift 10000-01-01
dc.embargo.terms forever es_ES
dc.identifier.doi 10.1021/am401489n
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Química - Departament de Química es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.description.bibliographicCitation Navalón Oltra, S.; Sempere Aracil, D.; Alvaro Rodríguez, MM.; García Gómez, H. (2013). Influence of Hydrogen Annealing on the photocatalytic activity of diamond supported gold catalysts. ACS Applied Materials and Interfaces. 5(15):7160-7169. doi:10.1021/am401489n es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.1021/am401489n es_ES
dc.description.upvformatpinicio 7160 es_ES
dc.description.upvformatpfin 7169 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 5 es_ES
dc.description.issue 15 es_ES
dc.relation.senia 246265
dc.identifier.eissn 1944-8252


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