Photo-catalytic reduction of carbon dioxide with in-situ synthesized CoPc/TiO2 under visible light irradiation |
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| Authors: | Zhihuan Zhao Jimin Fan Mingming Xie Zhizhong Wang |
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| Institution: | 1. Department of Physics and Earth Sciences, University of Parma, Parco Area delle Scienze 157/A, 43124 Parma, Italy;2. Department of Neurosciences, University of Parma, Via Volturno 39, 43125 Parma, Italy;3. Inaf-IAPS, Via Fosso del Cavaliere 100, 00133 Rome, Italy;4. Department of Psychologic, Umanistic and Earth Sciences, University of Chieti-Pescara, Via Vestini 31, 66013 Chieti, Italy;5. CNR-ISMAR, Via Gobetti 101, 40129 Bologna, Italy;1. Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA;1. Dipartimento di Ingegneria dell’Innovazione Università del Salento, Via Arnesano, 73100, Lecce, Italy;2. Dipartimento di Chimica, Università degli Studi di Bari “Aldo Moro”, via Orabona 4, 70126 Bari, Italy;3. CNR-Istituto di Chimica dei Composti Organometallici (ICCOM), Bari Section, via Orabona 4, 70126 Bari, Italy;4. Dipartimento di Energia, Ingegneria dell’Informazione e Modelli Matematici, DEIM Università di Palermo Viale delle Scienze, Ed. 6, 90128 Palermo, Italy;1. Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA |
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| Abstract: | CO2 is photo-catalytically reduced to produce formic acid, methanol, formaldehyde in an aqueous solution using visible light irradiation and in-situ synthesized CoPc/TiO2. CoPc/TiO2 nano-composite is in-situ synthesized through the annulations of 1,2-dicyanobenzene on the surface of TiO2 with Co(II) as template. The prepared catalysts are characterized by means of XRD, DTA–TG, UV–vis and FT-IR methods. The photo-catalytic activity of these catalysts under visible light is discussed. The experimental results indicate that cobalt-phthalocyanine (CoPc) and TiO2 are indeed synthesized by the in-situ method. Under the visible light irradiation, CoPc molecules are excited first and the excited electrons are injected into the conduction band of TiO2, then the separation of electron–hole pairs is increased so that the photo-catalytic efficiency is increased. The results show that the in-situ CoPc/TiO2 out performed physical absorbed CoPc/TiO2. The total organic carbon (TOC) yield of 0.7 wt.% in-situ CoPc/TiO2 is 1714.9 μmol/g catal. following 10 h of visible light illumination. The yield is much higher than those of TiO2 and physical absorbed CoPc/TiO2. |
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