dc.contributorUniversity of Concepcion
dc.contributorUniv. Orleans
dc.contributorMillenium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC)
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniversity of Cadiz
dc.contributorUniversity of Malaga
dc.date.accessioned2019-10-06T15:27:11Z
dc.date.accessioned2022-12-19T18:27:35Z
dc.date.available2019-10-06T15:27:11Z
dc.date.available2022-12-19T18:27:35Z
dc.date.created2019-10-06T15:27:11Z
dc.date.issued2019-05-15
dc.identifierCatalysis Today, v. 328, p. 125-135.
dc.identifier0920-5861
dc.identifierhttp://hdl.handle.net/11449/187155
dc.identifier10.1016/j.cattod.2018.12.008
dc.identifier2-s2.0-85058181163
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5368193
dc.description.abstractCarbon-containing SiO 2 -based photocatalysts were prepared by the solvothermal treatment of rice husk as biogenic precursor in the presence and absence of TiO 2 and used for the photocatalytic degradation of rhodamine-B under simulated solar light. Data showed that the prepared catalysts are mainly composed of biogenic silica and displayed mesoporous character with surface areas ranging from 65 to 174 m 2 g -1 . The obtained materials showed photocatalytic activity comparable to that of commercial TiO 2 -P25 powders for the degradation of rhodamine-B under sunlight. The calcination at 350 °C improved the photocatalytic activity of the biogenic precursor by three times in the absence of TiO 2 . At converse, calcination of sample SiO 2 -TiO 2 decreased the photoactivity due to the appearance of non-photoactive TiSiO 4 crystalline phases in the catalyst, as inferred by XRD and XPS. A reaction mechanism for rhodamine-B degradation excluding the deethylation pathway has been proposed, based on the evolution of the absorbance spectra of rhodamine-B upon the photocatalytic tests.
dc.languageeng
dc.relationCatalysis Today
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectArtificial solar light
dc.subjectBiogenic silica
dc.subjectPhotocatalysis
dc.subjectRhodamine B
dc.subjectRice husks
dc.titleSunlight photoactivity of rice husks-derived biogenic silica
dc.typeArtículos de revistas


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