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Issue 4, 2013
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Effect of additives in photocatalytic degradation of commercial azodye Lanaset Sun Yellow 180

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Abstract

The photocatalytic degradation of the commercial dye Lanaset Sun Yellow 180 was studied in the presence and absence of the different additives used in the dye's formulation. The experiments were performed with Degussa P25 as received and doped with Fe (Fe–TiO2) and a new catalyst synthesized by our research group (ECT-1023). The best efficiency was achieved with Fe–TiO2. With this catalyst, the formation of a photoactive complex was observed between the dye and Fe atoms of the catalyst surface that accelerated degradation. FTIR studies revealed that the complex was formed by interaction between the dye's carbonyl groups and the atoms of the metal. In mixtures of the dye containing citric acid or acetate, degradation was notably inhibited with the catalysts Fe–TiO2 and ECT-1023 because of the formation of carboxylates on their surface. This inhibitory effect was neutralized when all the additives were present in the solution. Toxicity analyses indicated that intermediates were not toxic. Thus, the photocatalytic methods seem to be optimal for the decolourization of wastewaters containing this dye.

Graphical abstract: Effect of additives in photocatalytic degradation of commercial azo dye Lanaset Sun Yellow 180

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Publication details

The article was received on 15 Jun 2012, accepted on 09 Nov 2012 and first published on 12 Nov 2012


Article type: Paper
DOI: 10.1039/C2PP25191D
Photochem. Photobiol. Sci., 2013,12, 703-708

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    Effect of additives in photocatalytic degradation of commercial azo dye Lanaset Sun Yellow 180

    J. Araña, D. Zerbani, J. A. Herrera Melián, D. Garzón Sousa, O. González Díaz and J. M. Doña Rodríguez, Photochem. Photobiol. Sci., 2013, 12, 703
    DOI: 10.1039/C2PP25191D

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