TY - JOUR
T1 - Palygorskite-TiO2 nanocomposites
T2 - Part 2. photocatalytic activities in decomposing air and organic pollutants
AU - Papoulis, D.
AU - Komarneni, S.
AU - Panagiotaras, D.
AU - Nikolopoulou, A.
AU - Christoforidis, K. C.
AU - Fernández-Garcia, M.
AU - Li, Huihui
AU - Shu, Yin
AU - Sato, Tsugio
N1 - Funding Information:
Dr. Christoforidis K.C. acknowledges Marie Curie Action — Intra-European Fellowship ( FP7-PEOPLE-2009-IEF-253445 ) for financial support.
PY - 2013/10
Y1 - 2013/10
N2 - 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.
AB - 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.
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U2 - 10.1016/j.clay.2012.03.003
DO - 10.1016/j.clay.2012.03.003
M3 - Article
AN - SCOPUS:84885081424
SN - 0169-1317
VL - 83-84
SP - 198
EP - 202
JO - Applied Clay Science
JF - Applied Clay Science
ER -