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Molecules 2015, 20(1), 396-415; doi:10.3390/molecules20010396

Photoreduction of Carbon Dioxide to Formic Acid in Aqueous Suspension: A Comparison between Phthalocyanine/TiO2 and Porphyrin/TiO2 Catalysed Processes

1
Department of Engineering for Innovation, University of Salento, via Arnesano, Lecce 73100, Italy
2
CNR-ICCOM UOS of Bari, Chemistry Department, University of Bari, Via Orabona, 4, Bari 70126, Italy
3
Chemistry Department, University of Bari "A. Moro", via Orabona, 4, Bari 70126, Italy
4
Dipartimento di Energia, Ingegneria dell'Informazione e Modelli Matematici, DEIM, Università di Palermo, Viale delle Scienze, Ed. 6, Palermo 90128, Italy
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 15 November 2014 / Accepted: 22 December 2014 / Published: 30 December 2014
(This article belongs to the Special Issue Tetrapyrroles, Porphyrins and Phthalocyanines)
View Full-Text   |   Download PDF [804 KB, uploaded 30 December 2014]   |  

Abstract

Composite materials prepared by loading polycrystalline TiO2 powders with lipophilic highly branched Cu(II)- and metal-free phthalocyanines or porphyrins, which have been used in the past as photocatalysts for photodegradative processes, have been successfully tested for the efficient photoreduction of carbon dioxide in aqueous suspension affording significant amounts of formic acid. The results indicated that the presence of the sensitizers is beneficial for the photoactivity, confirming the important role of Cu(II) co-ordinated in the middle of the macrocycles. A comparison between Cu(II) phthalocyanines and Cu(II) porphyrins indicated that the Cu(II)- phthalocyanine sensitizer was more efficient in the photoreduction of CO2 to formic acid, probably due to its favorable reduction potential. View Full-Text
Keywords: CO2; heterogeneous photocatalysis; phthalocyanines; porphyrins; photo-reduction; TiO2 CO2; heterogeneous photocatalysis; phthalocyanines; porphyrins; photo-reduction; TiO2
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mele, G.; Annese, C.; D'Accolti, L.; De Riccardis, A.; Fusco, C.; Palmisano, L.; Scarlino, A.; Vasapollo, G. Photoreduction of Carbon Dioxide to Formic Acid in Aqueous Suspension: A Comparison between Phthalocyanine/TiO2 and Porphyrin/TiO2 Catalysed Processes. Molecules 2015, 20, 396-415.

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