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Catalysts 2016, 6(6), 84; doi:10.3390/catal6060084

Kinetic Model for Simultaneous Adsorption/Photodegradation Process of Alizarin Red S in Water Solution by Nano-TiO2 under Visible Light

School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy
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Author to whom correspondence should be addressed.
Academic Editors: Polycarpos Falaras, Dionysios (Dion) Demetriou Dionysiou, Giusy Lofrano, Suresh C. Pillai, Adrián M. T. Silva and Xie Quan
Received: 15 April 2016 / Revised: 26 May 2016 / Accepted: 1 June 2016 / Published: 8 June 2016
(This article belongs to the Special Issue Photocatalytic Wastewater Treatment)
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Abstract

The simultaneous adsorption and visible light photodegradation of Alizarin Red S in water solutions were studied in real time mode by using nano-TiO2, such as Anatase and Aeroxide P-25, supported on polypropylene strips. Kinetic results of the overall process were compared with those obtained from separated steps of adsorption and photodegradation previously studied; kinetic advantages were evidenced with the simultaneous approach. From the study of different dye concentrations, a kinetic model has been proposed which describes the overall process. This model considered two consecutive processes: The adsorption of dye on TiO2 surface and its photodegradation. The obtained results were in good agreement with experimental data and can predict the profiles of free dye, dye adsorbed on TiO2 and photoproduct concentrations during the total process. View Full-Text
Keywords: Alizarin Red S; photodegradation; visible light; titanium dioxide; kinetics Alizarin Red S; photodegradation; visible light; titanium dioxide; kinetics
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Giovannetti, R.; Rommozzi, E.; D’Amato, C.A.; Zannotti, M. Kinetic Model for Simultaneous Adsorption/Photodegradation Process of Alizarin Red S in Water Solution by Nano-TiO2 under Visible Light. Catalysts 2016, 6, 84.

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