Sonocatalytic degradation of oxalic acid in the presence of oxygenand Pt/TiO2

Tony Chave, Nathalie M. Navarro, Patrick Pochon, Nina Perkas, Aharon Gedanken, Sergey I. Nikitenko

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25 Scopus citations


In order to treat aqueous effluents containing organic pollutants, several techniques can be considereddepending on the organic compound concentration. Sonochemistry appears to be a promising solutionto answer water remediation issue. In fact, when submitted into a liquid, ultrasound can induce thenucleation, growth, and violent collapse of vapor/gas filled bubbles. However, despite the extreme localconditions observed during acoustic cavitation, using ultrasound alone is efficient only at low concentration in organic pollutants. In the present study, 0.05 M oxalic acid degradation kinetics were followed at40°C under various conditions, in presence or not of Pt/TiO2 catalyst under silent conditions or ultrasoundat 20 and 360 kHz. Experiments were achieved under controlled atmosphere and comparison betweenargon, Ar/O2(20 vol% O2) and pure O2 conditions was performed. Oxidation rate increase of oxalic acidwas measured under Ar/O2 atmosphere in presence of Pt/TiO2 catalyst due to strong dispersion effectof both low and high ultrasonic frequency and formation of chemically active species by sonolysis. Highfrequency ultrasonic irradiation under Ar/O2 atmosphere gives the highest kinetic increase compared tosilent conditions with oxalic acid degradation rate around 13 μmol min-1 at 40°C with 2 g L-1 of 3 wt%Pt on P25 TiO2 catalyst.

Original languageEnglish
Pages (from-to)55-62
Number of pages8
JournalCatalysis Today
Issue numberPA
StatePublished - 1 Mar 2015

Bibliographical note

Publisher Copyright:
© 2014 Elsevier B.V.


  • Catalysis-Ultrasound
  • Oxalic acid
  • Oxygen
  • Sonocatalysis
  • Sonochemistry


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