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Influence of mass transfer and chemical reaction on ozonation of azo dyes.
Water Sci Technol. 2004; 49(4):37-43.WS

Abstract

Azo dyes can be only mineralised by chemical oxidation. In this paper the oxidation of Reactive Black 5 (RB 5) and Reactive Orange 96 (RO 96) with concentrations between 35 and 5,700 mgL(-1) (RB 5) and between 20 and 2,050 mgL(-1) (RO 96) was investigated in a lab-scale bubble column. The reactor was modelled for two cases, a completely mixed and a plug flow gas phase. The oxidation rate was influenced by mass transfer for all dye concentrations used. For low dye concentrations mass transfer alone was decisive for the reaction rate showing no enhancement due to chemical reaction, E approximately equal to 1. However, in the region of high dye concentrations, the slope of the ozone concentration profile inside the liquid boundary layer increases more and more with increasing dye concentration as a result of a chemical oxidation. Therefore, the enhancement factor depends on the type and concentration of the azo dyes. For RB 5, a diazo dye, an enhancement factor of E = 5.5 was observed for cd = 2,000 mgL(-1), RO 96, a mono azo dye, with a remarkably higher chemical oxidation rate shows an E = 16 for cd = 2,050 mgL(-1).

Authors+Show Affiliations

Choi IS
Department of Environmental Engineering, Technical University of Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany. insu.choi@tu-berlin.de
Wiesmann U
No affiliation info available

MeSH

Azo CompoundsColoring AgentsKineticsModels, TheoreticalOxidants, PhotochemicalOxidation-ReductionOzoneWaste Disposal, FluidWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15077945

Citation

Choi, I S., and U Wiesmann. "Influence of Mass Transfer and Chemical Reaction On Ozonation of Azo Dyes." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 49, no. 4, 2004, pp. 37-43.
Choi IS, Wiesmann U. Influence of mass transfer and chemical reaction on ozonation of azo dyes. Water Sci Technol. 2004;49(4):37-43.
Choi, I. S., & Wiesmann, U. (2004). Influence of mass transfer and chemical reaction on ozonation of azo dyes. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 49(4), 37-43.
Choi IS, Wiesmann U. Influence of Mass Transfer and Chemical Reaction On Ozonation of Azo Dyes. Water Sci Technol. 2004;49(4):37-43. PubMed PMID: 15077945.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of mass transfer and chemical reaction on ozonation of azo dyes. AU - Choi,I S, AU - Wiesmann,U, PY - 2004/4/14/pubmed PY - 2004/7/28/medline PY - 2004/4/14/entrez SP - 37 EP - 43 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci Technol VL - 49 IS - 4 N2 - Azo dyes can be only mineralised by chemical oxidation. In this paper the oxidation of Reactive Black 5 (RB 5) and Reactive Orange 96 (RO 96) with concentrations between 35 and 5,700 mgL(-1) (RB 5) and between 20 and 2,050 mgL(-1) (RO 96) was investigated in a lab-scale bubble column. The reactor was modelled for two cases, a completely mixed and a plug flow gas phase. The oxidation rate was influenced by mass transfer for all dye concentrations used. For low dye concentrations mass transfer alone was decisive for the reaction rate showing no enhancement due to chemical reaction, E approximately equal to 1. However, in the region of high dye concentrations, the slope of the ozone concentration profile inside the liquid boundary layer increases more and more with increasing dye concentration as a result of a chemical oxidation. Therefore, the enhancement factor depends on the type and concentration of the azo dyes. For RB 5, a diazo dye, an enhancement factor of E = 5.5 was observed for cd = 2,000 mgL(-1), RO 96, a mono azo dye, with a remarkably higher chemical oxidation rate shows an E = 16 for cd = 2,050 mgL(-1). SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/15077945/Influence_of_mass_transfer_and_chemical_reaction_on_ozonation_of_azo_dyes_ DB - PRIME DP - Unbound Medicine ER -