Browse by author
Lookup NU author(s): Professor Ian Metcalfe
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
The effect of low frequency (20 kHz) ultrasonic irradiation on the removal of sodium dodecylbenzene sulfonate (SDBS), phenol, 2-chlorophenol and 3,4-dichlorophenol from aqueous solutions has been investigated. Sonolytic degradation of SDBS (at an initial concentration of 1 g/l) results in the formation of lower molecular weight compounds and is accompanied by low total oxidation rates. In parallel, water sonolysis results in the formation of hydrogen peroxide. Several heterogeneous catalysts (three noble metals and a metal oxide) were tested with respect to their effect on SDBS sonolysis. Of these, a CuO·ZnO supported on alumina catalyst appears to enhance both SDBS fragmentation and total oxidation rates as well as hydrogen peroxide formation. Phenolic compounds (at an initial concentration of 0.1 g/l) are only partially removed by ultrasonic irradiation with 2-chlorophenol being more susceptible to degradation than phenol and 3,4-dichlorophenol. However, the presence of Fe2+ ions at concentrations as low as about 10−3 g/l generally increases the rate of the uncatalysed sonolytic degradation. This is attributed to iron being capable of readily decomposing hydrogen peroxide in a Fenton-like process to form reactive hydroxyl radicals as well as being an effective oxidation catalyst.
Author(s): Papadaki M, Emery RJ, Abu-Hassan MA, Diaz-Bustos A, Metcalfe IS, Mantzavinos D
Publication type: Article
Publication status: Published
Journal: Separation and Purification Technology
Year: 2004
Volume: 34
Issue: 1-3
Pages: 35-42
ISSN (print): 1383-5866
ISSN (electronic): 1873-3794
Publisher: Pergamon
URL: http://dx.doi.org/10.1016/S1383-5866(03)00172-2
DOI: 10.1016/S1383-5866(03)00172-2
Notes: 768HL SEP PURIF TECHNOL
Altmetrics provided by Altmetric
