Issue 24, 2002
From the journal:

Physical Chemistry Chemical Physics

Synergistic effects of sonolysis combined with photocatalysis in the degradation of an azodye

Elena Sellia  

a Dipartimento di Chimica Fisica ed Elettrochimica, Università di Milano, Via Golgi 19, I-20133Milano, Italy
E-mail: elena.selli@unimi.it
Fax: +39 02 50314300

Abstract

Photocatalysis and sonolysis exhibit synergistic effects in the degradation of organic molecules in aqueous suspension, when low ultrasound frequency (i.e. 20 kHz) is employed. The degradation of the azo dye Acid Orange 8 in aqueous suspensions was systematically evaluated under sonolysis, photocatalysis and sonophotocatalysis as a function of dye concentration, amount and type of photocatalyst (TiO2 or ZnO) and catalase addition, in terms of pseudo-first-order degradation rate constants. The evolution of hydrogen peroxide was also monitored. Synergistic effects of the combination of ultrasound and photocatalysis should mainly involve the aqueous phase and be due to an increased concentration of reactive radicals, consequent to the action of ultrasound on the peroxide species produced by both photocatalysis and sonolysis.

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Article information

DOI
https://doi.org/10.1039/B205881B
Article type
Paper
Submitted
18 Jun 2002
Accepted
25 Oct 2002
First published
07 Nov 2002

Phys. Chem. Chem. Phys., 2002,4, 6123-6128

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Synergistic effects of sonolysis combined with photocatalysis in the degradation of an azo dye

E. Selli, Phys. Chem. Chem. Phys., 2002, 4, 6123 DOI: 10.1039/B205881B

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