Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2
[EN] We have explored the photoelectrochemical behavior of carbon/titania composites, aiming at understanding the mechanisms of the photoinduced processes occurring in such hybrid photocatalysts that lead to enhanced photocatalytic efficiencies of the pristine semiconductor for the photodegradation of refractory pollutants in water. In a first step, spectrometric techniques have been applied to investigate the structural and optical properties of the carbon/semiconductor composites compared to the intrinsic characteristics of the unsupported semiconductor. The second approach consisted of the preparation of thin-film electrodes to explore the photoinduced reactions occurring at the interface under UV light and bias potential. The gathered results provided experimental evidence on the carbon-mediated photoinduced reactions, distinguishing different mechanisms: (i) the carbon matrix acts as a charge-trapping network that modifies the fate of the photogenerated charge carriers (avoiding recombination and thus enhancing the photocatalytic efficiency); (ii) illumination of the carbon additive renders photogenerated carriers due to π–π* transitions, capable of participating in charge transfer reactions with electron donors present in the reaction medium. Our results point out that beyond the beneficial effect of the porosity of the support, the carbon matrix does play an important role in the photoinduced reactions of carbon-supported photocatalysts.
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Format: | artículo biblioteca |
Language: | English |
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Royal Society of Chemistry (UK)
2012-06
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Subjects: | Carbon/titania composites, Pollutants, Photocatalytic performance, |
Online Access: | http://hdl.handle.net/10261/98282 |
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dig-incar-es-10261-982822019-02-20T13:51:36Z Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 Haro Remón, Marta Fernández Velasco, Leticia Ovín Ania, María Concepción Carbon/titania composites Pollutants Photocatalytic performance [EN] We have explored the photoelectrochemical behavior of carbon/titania composites, aiming at understanding the mechanisms of the photoinduced processes occurring in such hybrid photocatalysts that lead to enhanced photocatalytic efficiencies of the pristine semiconductor for the photodegradation of refractory pollutants in water. In a first step, spectrometric techniques have been applied to investigate the structural and optical properties of the carbon/semiconductor composites compared to the intrinsic characteristics of the unsupported semiconductor. The second approach consisted of the preparation of thin-film electrodes to explore the photoinduced reactions occurring at the interface under UV light and bias potential. The gathered results provided experimental evidence on the carbon-mediated photoinduced reactions, distinguishing different mechanisms: (i) the carbon matrix acts as a charge-trapping network that modifies the fate of the photogenerated charge carriers (avoiding recombination and thus enhancing the photocatalytic efficiency); (ii) illumination of the carbon additive renders photogenerated carriers due to π–π* transitions, capable of participating in charge transfer reactions with electron donors present in the reaction medium. Our results point out that beyond the beneficial effect of the porosity of the support, the carbon matrix does play an important role in the photoinduced reactions of carbon-supported photocatalysts. The authors thank the financial support of the Spanish MINECO and FICYT (grants CTM2008/01956, CTM2011/02338 and PC10-002). LFV and MH thank CSIC for JAE-Pre and JAE-Doc contracts. Peer reviewed 2014-06-12T11:44:24Z 2014-06-12T11:44:24Z 2012-06 artículo http://purl.org/coar/resource_type/c_6501 Catalysis Science and Technology 2(11): 2264-2272 (2012) 2044-4753 http://hdl.handle.net/10261/98282 10.1039/C2CY20270K 2044-4761 en Postprint http://dx.doi.org/10.1039/C2CY20270K Sí open Royal Society of Chemistry (UK) |
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Carbon/titania composites Pollutants Photocatalytic performance Carbon/titania composites Pollutants Photocatalytic performance Haro Remón, Marta Fernández Velasco, Leticia Ovín Ania, María Concepción Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 |
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[EN] We have explored the photoelectrochemical behavior of carbon/titania composites, aiming at understanding the mechanisms of the photoinduced processes occurring in such hybrid photocatalysts that lead to enhanced photocatalytic efficiencies of the pristine semiconductor for the photodegradation of refractory pollutants in water. In a first step, spectrometric techniques have been applied to investigate the structural and optical properties of the carbon/semiconductor composites compared to the intrinsic characteristics of the unsupported semiconductor. The second approach consisted of the preparation of thin-film electrodes to explore the photoinduced reactions occurring at the interface under UV light and bias potential. The gathered results provided experimental evidence on the carbon-mediated photoinduced reactions, distinguishing different mechanisms: (i) the carbon matrix acts as a charge-trapping network that modifies the fate of the photogenerated charge carriers (avoiding recombination and thus enhancing the photocatalytic efficiency); (ii) illumination of the carbon additive renders photogenerated carriers due to π–π* transitions, capable of participating in charge transfer reactions with electron donors present in the reaction medium. Our results point out that beyond the beneficial effect of the porosity of the support, the carbon matrix does play an important role in the photoinduced reactions of carbon-supported photocatalysts. |
format |
artículo |
topic_facet |
Carbon/titania composites Pollutants Photocatalytic performance |
author |
Haro Remón, Marta Fernández Velasco, Leticia Ovín Ania, María Concepción |
author_facet |
Haro Remón, Marta Fernández Velasco, Leticia Ovín Ania, María Concepción |
author_sort |
Haro Remón, Marta |
title |
Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 |
title_short |
Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 |
title_full |
Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 |
title_fullStr |
Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 |
title_full_unstemmed |
Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2 |
title_sort |
carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of c/tio2 |
publisher |
Royal Society of Chemistry (UK) |
publishDate |
2012-06 |
url |
http://hdl.handle.net/10261/98282 |
work_keys_str_mv |
AT haroremonmarta carbonmediatedphotoinducedreactionsasakeyfactorinthephotocatalyticperformanceofctio2 AT fernandezvelascoleticia carbonmediatedphotoinducedreactionsasakeyfactorinthephotocatalyticperformanceofctio2 AT ovinaniamariaconcepcion carbonmediatedphotoinducedreactionsasakeyfactorinthephotocatalyticperformanceofctio2 |
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1777668922671104000 |