Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20978
Title: A systematic study of the degradation of dimethyl phthalate using a high-frequency ultrasonic process
Authors: Xu, LJ
Chu, W 
Graham, N
Keywords: Advanced oxidation process
Dimethyl phthalate
Hydrogen peroxide
Intermediates
Sonochemical
Ultrasound
Issue Date: 2013
Publisher: Elsevier
Source: Ultrasonics sonochemistry, 2013, v. 20, no. 3, p. 892-899 How to cite?
Journal: Ultrasonics sonochemistry 
Abstract: A comprehensive study of the sonochemical degradation of dimethyl phthalate (DMP) was carried out using high-frequency ultrasonic processes. The effects of various operating parameters were investigated, including ultrasonic frequency, power density, initial DMP concentration, solution pH and the presence of hydrogen peroxide. In general, a frequency of 400 kHz was the optimum for achieving the highest DMP degradation rate. The degradation rate was directly proportional to the power density and inversely related to the initial DMP concentration. It was interesting to find that faster removal rate was observed under weakly acidic condition, while hydrolysis effect dominated in extreme-basic condition. The addition of hydrogen peroxide can increase the radical generation to some extent. Furthermore, both hydroxylation of the aromatic ring and oxidation of the aliphatic chain appear to be the major mechanism of DMP degradation by sonolysis based on LC/ESI-MS analysis. Among the principle reaction intermediates identified, tri- and tetra-hydroxylated derivatives of DMP, as well as hydroxylated monomethyl phthalates and hydroxylated phthalic acid were reported for the first time in this study. Reaction pathways for DMP sonolysis are proposed based on the detected intermediates.
URI: http://hdl.handle.net/10397/20978
ISSN: 1350-4177
DOI: 10.1016/j.ultsonch.2012.11.005
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