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Comparative study of sonochemical reactors with different geometry using thermal and chemical probes

Authors :
Sergey I. Nikitenko
C. Le Naour
Philippe Moisy
Chimie Nucléaire Analytique et Bio-environnementale (CNAB)
Université Sciences et Technologies - Bordeaux 1 (UB)-Centre National de la Recherche Scientifique (CNRS)
Institut de Physique Nucléaire d'Orsay (IPNO)
Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Centre de la Vallée du Rhône, Site de Marcoule (VALRHO, SITE DE MARCOULE)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Université Sciences et Technologies - Bordeaux 1-Centre National de la Recherche Scientifique (CNRS)
Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Source :
Ultrasonics Sonochemistry, Ultrasonics Sonochemistry, 2007, 14, pp.330-336. ⟨10.1016/j.ultsonch.2006.06.006⟩, Ultrasonics Sonochemistry, Elsevier, 2007, 14, pp.330-336. ⟨10.1016/j.ultsonch.2006.06.006⟩
Publication Year :
2007
Publisher :
HAL CCSD, 2007.

Abstract

Laboratory scale 20 kHz sonochemical reactors with different geometries have been tested using thermal probes, the kinetics of H 2 O 2 formation, and the kinetics of diphenylmethane (DPhM) sonochemical darkening. Results revealed that the overall sonochemical reaction rates in H 2 O and DPhM are driven by the total absorbed acoustic energy and roughly independent the geometry of the studied reactors. However, the sonochemical efficiency, defined as η = VG / S , where G is a sonochemical yield of H 2 O 2 , V is a volume of sonicated liquid, and S is a surface of the sonotrode, was proved to increase with the decrease of S . This phenomenon was explained by growing of the maximum cavitating bubble size with ultrasonic intensity and its independence towards the specific absorbed acoustic power. For the cleaning bath reactor the kinetics of the sonochemical reactions in H 2 O and DPhM depends strongly on the reaction vessel materials: the reaction rates decreased with the increase of the materials elasticity. Kinetic study of H 2 SO 4 sonolysis using a sonoreactor without direct contact with titanium sonotrode showed that sulphate anion is an effective scavenger of OH radicals formed during water sonolysis.

Details

Language :
English
ISSN :
13504177
Database :
OpenAIRE
Journal :
Ultrasonics Sonochemistry, Ultrasonics Sonochemistry, 2007, 14, pp.330-336. ⟨10.1016/j.ultsonch.2006.06.006⟩, Ultrasonics Sonochemistry, Elsevier, 2007, 14, pp.330-336. ⟨10.1016/j.ultsonch.2006.06.006⟩
Accession number :
edsair.doi.dedup.....bc392e7bd97c478575b686964482afb4