Mechanism and dynamic study of reactive red X-3B dye degradation by ultrasonic-assisted ozone oxidation process.
Ultrason Sonochem
; 38: 681-692, 2017 Sep.
Article
em En
| MEDLINE
| ID: mdl-27543360
ABSTRACT
The effectiveness of ozone combined with ultrasound techniques in degrading reactive red X-3B is evaluated. A comparison among ozone (O3), ultrasonic (US), ozone/ultrasonic (O3/US) for degradation of reactive red X-3B has been performed. Results show that O3/US system was the most effective and the optimally synergetic factor reaches to 1.42 in O3/US system. The cavitation of ultrasound plays an important role during the degradation process. It is found that 99.2% of dye is degraded within 6min of reaction at the initial concentration of 100mg·L-1, pH of 6.52, ozone flux of 40L·h-1 and ultrasonic intensity of 200W·L-1. Ozonation reactions in conjunction with sonolysis indicate that the decomposition followed pseudo-first-order reaction kinetics but the degradation efficiencies are affected by operating conditions, particularly initial pH and ultrasonic intensity. A kinetic model is established based on the reaction corresponding to operational parameters. In addition, the main reaction intermediates, such as p-benzoquinone, catechol, hydroquinone, phthalic anhydride and phthalic acid, are separated and identified using GC/MS and a possible degradation pathway is proposed during the O3/US process.
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Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article