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Palygorskite–TiO2 nanocomposites: Part 2. photocatalytic activities in decomposing air and organic pollutants
Abstract In 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>290nm) 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.
Highlights ► TiO2–palygorskite samples (under UV) showed larger catalytic activity than P25. ► TiO2–palygorskite samples (solar-light) showed larger catalytic activity than P25. ► This higher activity could be attributed to the presence of well-dispersed TiO2.
Palygorskite–TiO2 nanocomposites: Part 2. photocatalytic activities in decomposing air and organic pollutants
Abstract In 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>290nm) 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.
Highlights ► TiO2–palygorskite samples (under UV) showed larger catalytic activity than P25. ► TiO2–palygorskite samples (solar-light) showed larger catalytic activity than P25. ► This higher activity could be attributed to the presence of well-dispersed TiO2.
Palygorskite–TiO2 nanocomposites: Part 2. photocatalytic activities in decomposing air and organic pollutants
Papoulis, D. (author) / Komarneni, S. (author) / Panagiotaras, D. (author) / Nikolopoulou, A. (author) / Christoforidis, K.C. (author) / Fernández-Garcia, M. (author) / Li, Huihui (author) / Shu, Yin (author) / Sato, Tsugio (author)
Applied Clay Science ; 83-84 ; 198-202
2012-03-19
5 pages
Article (Journal)
Electronic Resource
English
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