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

Molecules

Giuseppe Mele¹  Cosimo Annese⁴  Lucia D�olti²  Alberto De Riccardis¹  Caterina Fusco⁴  Leonardo Palmisano³  Anna Scarlino¹  Giuseppe Vasapollo¹ 

[1] Department of Engineering for Innovation, University of Salento, via Arnesano, Lecce 73100, Italy; E-Mails:;Chemistry Department, University of Bari “A. Moro”, via Orabona, 4, Bari 70126, Italy; E-Mail:;Dipartimento di Energia, Ingegneria dell’Informazione e Modelli Matematici, DEIM, Università di Palermo, Viale delle Scienze, Ed. 6, Palermo 90128, Italy; E-Mail:;CNR-ICCOM UOS of Bari, Chemistry Department, University of Bari, Via Orabona, 4, Bari 70126, Italy; E-Mails:

关键词: CO₂;    heterogeneous photocatalysis;    phthalocyanines;    porphyrins;    photo-reduction;    TiO₂;   

DOI  :  10.3390/molecules20010396

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.