Degradation of Alkylphenol Ethoxylate Surfactants in Water with Ultrasonic Irradiation

• Published in: Environmental science & technology Vol. 34; no. 2; pp. 311 - 317
• Main Authors: Destaillats, Hugo, Hung, Hui-Ming, Hoffmann, Michael R
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 15.01.2000
• Subjects: alkylphenol ethoxylates; Applied sciences; Biodegradation; Contamination; Critical micelle concentration; ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; Exact sciences and technology; Hydrophobicity; INDUSTRIAL WASTES; MUNICIPAL WASTES; OXIDATION; PHENOLS; Pollution; Radiation; Radiation effects; Rate constants; Solutions; Sonochemistry; Surface active agents; SURFACTANTS; Ultrasonic effects; WASTE PROCESSING; WASTE WATER; Water; Water treatment and pollution; USA; Sonochemical reaction; Water treatment; Non ionic surfactant; Reaction product; Cavitation bubble; Surfactant polymer; Chemical degradation; Free radical reaction; Chemical reaction kinetics; Ethylene oxide polymer; Reaction mechanism; Oxidation; Waste water purification; Ultrasound; Micellization
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es990384x

During the last years, many efforts have been devoted to the elimination of alkylphenol ethoxylate surfactants from aqueous systems. In this paper, the sonochemical degradation of aqueous solutions of Triton X-100 was performed at an ultrasonic frequency of 358 kHz and an applied power of 50 W. Analysis of the reaction products by HPLC-ES−MS suggests that the hydrophobic alkyl chain is the preferential site for oxidation. Alkylphenol, or short-chain ethoxylated phenols, were not generated as byproducts. To verify this hypothesis, the sonochemical degradation of the corresponding alkylphenols (e.g., tert-octylphenol) was performed under the same conditions; in these cases, similar rate constants and products were observed. These results differ from those reported for the biodegradation of alkylphenol ethoxylates. A substantial increase in the rate constant was observed for the degradation of Triton X-100 below its critical micelle concentration. This observation indicates that micelle formation serves to effectively isolate the free surfactant monomers from the water−air interface of the oscillating cavitation bubbles, thus decreasing the overall efficiency of the sonochemical process. The hydrophobic tail of the molecule is no longer exposed directly to the bubble “hot spot” when it is pointed into the core of the micelles.