Kumar, Anurag and Prajapati, Pankaj Kumar and Aathira, M.S. and Bansiwal, Amit and Boukherroub, Rabah and Jain, Suman L. (2019) Highly improved photoreduction of carbon dioxide to methanol using cobalt phthalocyanine grafted to graphitic carbon nitride as photocatalyst under visible light irradiation. Journal of Colloid and Interface Science, 243. pp. 201-213. ISSN 0021-9797, ESSN: 1095-7103

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Abstract

A substantially improved methanol yield was achieved from the photoreduction of carbon dioxide under visible light by using a hybrid photocatalyst consisting of molecular cobalt phthalocyanine tetracarboxylic acid (CoPc-COOH) complex immobilized to the organic semiconductor graphitic carbon nitride (g-C3N4) and triethylamine as sacrificial electron donor. The structural and morphological features of the hybrid photocatalyst determined by various techniques like FTIR, UV–Vis, Raman, XPS, TGA, BET etc. After 24 h of light irradiation, the methanol yield by using g-C3N4/CoPc-COOH photocatalyst (50 mg) was found to be 646.5 mmol g�1cat or 12.9 mmol g�1cat with conversion rate 538.75 mmol h�1 - g�1cat. However, the use of homogeneous CoPc-COOH (6.5 mmol Co, equivalent to g-C3N4/CoPc-COOH) and g-C3N4 (50 mg) provided 88.5 lmol (1770 lmol g�1cat) and 59.2 lmol (1184 lmol g�1cat) yield of methanol, respectively under identical conditions. The improved photocatalytic efficiency of the hybrid was attributed to the binding ability of CoPc-COOH to CO2 that provided the higher CO2 concentration on the support. Further, the semiconductor support provided better electron mobility and charge separation with the integrated benefit of facile recovery and recycling of the material at the end of the reduction process.

Item Type:	Article
Uncontrolled Keywords:	Photoreduction: Cobalt Phthalocyanine; Carbon Nitride; Methanol
Subjects:	Chemistry, Chemical Technology Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Mr. RK Lohiya
Date Deposited:	06 Mar 2019 05:23
Last Modified:	06 Mar 2019 05:23
URI:	http://neeri.csircentral.net/id/eprint/1169

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