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Título

Palygorskite-TiO2 nanocomposites: Part 2. photocatalytic activities in decomposing air and organic pollutants

AutorPapoulis, Dimitrios; Komarneni, Sridhar; Panagiotaras, Dionisios; Nikolopoulou, A.; Christoforidis, Konstantinos CSIC ORCID; Li, Huihui; Shu, Yin; Sato, Tsugio; Fernández, M.
Palabras claveToluene
Photocatalytic activity
DeNOx process
Nanocomposite
Titania
Palygorskite
Fecha de publicaciónoct-2013
EditorElsevier
CitaciónApplied Clay Science 83-84: 198-202 (2013)
ResumenIn this paper we measure the photocatalytic activities of small-sized TiO2 particles supported on palygorskite in five different proportions (TiO2:Pal ratios of 90:10, 80:20, 70:30, 60:40 and 50:50) in decomposing NO gas and a volatile organic compound (VOC, toluene). The prepared Pal-TiO2 nanocomposites showed significantly higher photocatalytic activity in decomposing NO gas under visible-light irradiation up to 2.6 times, and under UV light irradiation (λ > 290 nm) up to 1.17 times, than that of the commercial titania, P25. The best photocatalytic activities were measured for 30% palygorskite with 70% TiO2, which could be attributed to a combination of good dispersion, relatively low agglomeration and relatively high amount of TiO2. The photocatalytic efficiency of the prepared Pal-TiO2 samples in decomposing toluene was also tested. Under UV irradiation, all palygorskite-supported TiO2 samples showed larger catalytic activity compared to the commercial titania, P25. The reaction rates of toluene photo-oxidation were found to be 1.37–1.74 times greater than that of P25. The higher reaction rates corresponded to the samples containing 20–30% palygorskite. Under artificial solar-light irradiation all palygorskite-supported TiO2 catalysts showed higher toluene photo-oxidation rates compared to P25. The catalytic activity increased by 2.7–3.34 times under artificial solar-light irradiation. An increase in catalytic activity was observed with increasing TiO2 content up to 70%. The sample with 30% palygorskite and 70% TiO2 gave the highest reaction rates. Further decrease of palygorskite (increase of TiO2) content resulted in a decrease of the reaction rate.
Versión del editorhttps://doi.org/10.1016/j.clay.2012.03.003
URIhttp://hdl.handle.net/10261/182286
DOI10.1016/j.clay.2012.03.003
ISSN0169-1317
E-ISSN1872-9053
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