Photocatalytic oxidation of methyl orange in a three-phase fluidized bed reactor.

The photocatalytic oxidation of methyl orange under weak illumination conditions was carried out in two different types of fluidized bed reactors. TiO2 powder was employed as the photocatalysts and a 15 W low pressure mercury lamp was used as the light source and the reactor volume was 2.5 l. The parametric study of photocatalytic oxidation of methyl orange in two different types of fluidized beds was investigated; effect of catalyst loadings, pH, air flow rate, initial concentration and oxygen concentration on the oxidation reaction rate. The experimental results were analyzed in conjunction with the characteristics of fluidized bed and the reactor geometry effect on the reaction rate was analyzed.

[1]  J. R. Darwent,et al.  Methyl orange as a probe for photooxidation reactions of colloidal titanium dioxide , 1984 .

[2]  Walter Z. Tang,et al.  UV/TiO2 photocatalytic oxidation of commercial dyes in aqueous solutions , 1995 .

[3]  Lars Baetz Reutergådh,et al.  Photocatalytic decolourization of reactive azo dye: A comparison between TiO2 and us photocatalysis , 1997 .

[4]  T. Chou,et al.  Kinetics of photodecolorization of methyl orange using titanium dioxide as catalyst , 1993 .

[5]  Prashant V. Kamat,et al.  Environmental Photochemistry on Semiconductor Surfaces: Photosensitized Degradation of a Textile Azo Dye, Acid Orange 7, on TiO2 Particles Using Visible Light , 1996 .

[6]  J. Kiwi,et al.  Fast kinetic spectroscopy, decoloration and production of H2O2 induced by visible light in oxygenated solutions of the azo dye Orange II , 1999 .

[7]  Lung-Chyuan Chen,et al.  Effects of factors and interacted factors on the optimal decolorization process of methyl orange by ozone , 2000 .

[8]  M. Gehlen,et al.  Interaction of methyl orange with cationic micelles and its effect on dye photochemistry , 1995 .

[9]  L. Wang,et al.  Photocatalytic degradation of AZO dyes by supported TiO2 + UV in aqueous solution. , 2000, Chemosphere.

[10]  Rajalingam Renganathan,et al.  Study on TiO2-mediated photocatalytic degradation of methylene blue , 1995 .

[11]  J. R. Darwent,et al.  Photoreduction of methyl orange sensitized by colloidal titanium dioxide , 1984 .

[12]  O. M. Kut,et al.  TiO2-Assisted Degradation of Environmentally Relevant Organic Compounds in Wastewater Using a Novel Fluidized Bed Photoreactor , 1996 .

[13]  X. Verykios,et al.  The effect of operational parameters and TiO2-doping on the photocatalytic degradation of azo-dyes , 1999 .