Details

Autor(en) / Beteiligte

• Tang, Walter Z
• An, Huren

Titel

Photocatalytic Degradation Kinetics and Mechanism of Acid Blue 40 by TiO sub(2)/UV in Aqueous Solution

Ist Teil von

• Chemosphere (Oxford), 1995-11, Vol.31 (9), p.4171-4171

Erscheinungsjahr

1995

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Photocatalyzed oxidation kinetics and mechanism of Acid Blue 40 at different pH values by TiO sub(2)/UV were studied. It is found that at pH 3, photocatalytic oxidation kinetics of Acid Blue 40 follows the Langmuir-Hinshelwood model, with reaction rate constant k of 0.0074 mM/min and adsorption constant K of 7.05 l/mM; While at higher pH values, no adequate kinetic model can be used. A yellow intermediate has been detected. Its appearance and disappearance with the reaction time are measured in terms of absorbance intensity. More than five hours are needed to completely mineralize the dye and its intermediate. It is found that Fe super(2+) does not have significant influence on the reaction, while H sub(2)O sub(2) could retard the reaction when its concentration is higher than 0.01 mM.