title: Iron(II)-catalyzed enhancement of ultrasonic-induced degradation of diethylstilbestrol (DES).
abstract: The oxidation of the endocrine disruptor, diethylstilbestrol (DES) in aqueous media by ultrasound is significantly enhanced by Fe(II) catalyst. The observed enhancement is likely the result of increased levels of hydroxyl radicals from the iron-promoted reduction of the hydrogen peroxide produced during ultrasonic irradiation. The degradation is effective over a range of concentrations and is consistent with pseudo first-order kinetics. Relatively high concentrations of hydrogen peroxide, ~450 mM, are present in solution under our experimental conditions after 1 h of ultrasonic irradiation (665 kHz). The concentration of H2O2in solution decreased with the addition of Fe(II) along with an increase in the degradation of DES. Hydrogen peroxide alone does not appreciably degrade DES. Our results demonstrate ultrasonic-induced degradation of DES can be accelerated with the addition of Fe(II). The combination of ultrasonic irradiation and Fe(II)-promoted conversion of H2O2to hydroxyl radical may provide a valuable strategy for the treatment of organic pollutants.
authors.affiliation: University Abdel Malek Essaadi, Science Faculty, Applied Physical Chemistry Lab, Tetouan, Morocco.
authors.forename: N
authors.initials: N
authors.lastname: Ben Abderrazik
authors.affiliation: University Abdel Malek Essaadi, Science Faculty, Applied Physical Chemistry Lab, Tetouan, Morocco.
authors.forename: A
authors.initials: A
authors.lastname: Azmani
authors.affiliation: National Institute of Agronomic Research (INRA), Tangier, Morocco.
authors.forename: C
authors.initials: C
authors.lastname: R'kiek
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
authors.forename: Weihua
authors.initials: W
authors.lastname: Song
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
authors.forename: Kevin E
authors.initials: KE
authors.lastname: O'Shea
keywords: Advanced oxidation; Catalysis; Diethylstilbestrol; Hydroxyl radicals; Ultrasound