Zinc oxide-mediated photocatalytic decolorization of Ponceau S in aqueous suspension by visible lightReportar como inadecuado




Zinc oxide-mediated photocatalytic decolorization of Ponceau S in aqueous suspension by visible light - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

International Nano Letters

, 2:30

First Online: 24 October 2012Received: 21 April 2012Accepted: 04 September 2012

Abstract

ZnO, comprising nanosize particles approximately 40 nm has been prepared by heating 300°C ZnCO3, which was obtained as precipitate by mixing ZnSO4 and NH42CO3 solutions. The prepared ZnO was characterized by X-ray diffraction, scanning electron microscopy SEM, laser-induced breakdown spectroscopy, and adsorption studies. It has been used to catalyze the decolorization of Ponceau S PS, a model diazo dye, in an aqueous suspension under visible light I ≈ 1.8 × 10 W cm. This ZnO was found to be more efficient as a photocatalyst compared to pristine ZnO. ZnO samples with higher temperatures 500°C and 700°C show less catalytic activity. SEM images show that the particle size of ZnO increases with the increase in calcined temperature of ZnO through agglomeration, resulting in a decrease in surface area. Photodecolorization of PS is affected by its and ZnO concentrations, but unaffected by the initial pH of the solutions in the range of 4 to 7. Illumination for a sufficiently long time completely mineralizes the dye, but no Zn can be detected in the clear solution.

Photodegradation kinetics in the ZnO suspension obeys the Langmuir-Hinshelwood equation, and some activation of the ZnO surface by light is indicated.

KeywordsNanosize ZnO Ponceau S PS dye Adsorption Photodecolorization Mineralization Inner filter effect Langmuir-hinshelwood equation Electronic supplementary materialThe online version of this article doi:10.1186-2228-5326-2-30 contains supplementary material, which is available to authorized users.

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Autor: Muhammad Muslim - Md Ahsan Habib - Abu Jafar Mahmood - Tajmeri Selima Akhter Islam - Iqbal Mohmmad Ibrahim Ismail

Fuente: https://link.springer.com/







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