Photocatalytic Degradation of Methyl Orange by TiO2/Schorl Photocatalyst: Kinetics and Thermodynamics

Huan Yan Xu; Xue Li; Yan Li; Ping Li; Wei Chao Liu

doi:10.4028/www.scientific.net/AMM.713-715.2789

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 713-715Photocatalytic Degradation of Methyl Orange by...

Photocatalytic Degradation of Methyl Orange by TiO₂/Schorl Photocatalyst: Kinetics and Thermodynamics

Abstract:

An active dye, Methyl Orange (MO) was employed as the target pollutant to evaluate the photocatalytic activity of TiO₂/schorl composite and the kinetics and thermodynamics of this process was emphasized in this work. Langmuir–Hinshelwood kinetic model was employed for the kinetic studies and the results revealed that the process of MO photocatalytic discoloration by TiO₂/schorl composite followed one order reaction kinetic equation under different conditions. The reaction rate constant (k) increased with initial MO concentration decreasing. When the catalyst dosage or solution pH increased, k values increased and then decreased. The possible reasons for these phenomena were discussed. Finally, the thermodynamic parameters ΔG, ΔH, ΔS were obtained by the classical Van't Hoff equation.

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Periodical:

Applied Mechanics and Materials (Volumes 713-715)

Pages:

2789-2792

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.713-715.2789

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Online since:

January 2015

Authors:

Huan Yan Xu*, Xue Li, Yan Li, Ping Li, Wei Chao Liu

Keywords:

Kinetics, Photocatalysis, Schorl, Thermodynamics, TiO₂

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