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Sonolysis, photolysis, and sequential sonophotolysis for the degradation of 2,4,6-Trichlorophenol: the effect of solution concentration

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posted on 16.10.2015, 08:38 by Collin G. Joseph, Gianluca Li-PumaGianluca Li-Puma, Awang Bono, Yun Hin Taufiq-Yap, Duduku Krishnaiah
Ultrasonic sound waves, ultraviolet-A irradiation and a combination of these two techniques were applied to a non-catalytic aqueous system containing 2,4,6-trichlorophenol (TCP) to study the effectiveness of sonolytic, photolytic and sonophotolytic oxidation processes in the degradation of TCP. The operating parameters for the horn-type sonicator and the UV-A lamp were kept constant along with the solution temperature but the TCP concentration was varied from 30 to 90 ppm. A first-order kinetic rate model was used to study the synergistic effect of the sonophotodegradation process. It was found that at a lower TCP concentration of 30 ppm, sonophotodegradation exhibited a synergistic effect but at a TCP concentration of 70 ppm and higher, sonophotodegradation resulted in an antagonistic effect. The synergistic effect was explained in terms of an increase in the ·OH radical formation by the combined process complemented by the photolysis of H2O2 formed by sonolysis. In contrast, the antagonistic effect was explained in terms of the combined effect of viscosity increase resulting in the reduction of the cavitation efficiency and degradation rate, and by considering the dynamics of bubble growth and implosion.

Funding

This research was supported by the Centre of Research & Innovation, University Malaysia Sabah (Grant No. FRG0115-TK-1=2007.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

CHEMICAL ENGINEERING COMMUNICATIONS

Volume

202

Issue

8

Pages

1061 - 1068 (8)

Citation

JOSEPH, C.G., 2015. Sonolysis, photolysis, and sequential sonophotolysis for the degradation of 2,4,6-Trichlorophenol: the effect of solution concentration. Chemical Engineering Communications, 202(8), pp. 1061-1068.

Publisher

© Taylor and Francis

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This is an Pre-Publication Manuscript of an article published by Taylor & Francis in Chemical Engineering Communications on 10th Jul, 2014, available online: http://wwww.tandfonline.com/10.1080/00986445.2014.901221.”

ISSN

0098-6445

Language

en