Kinetics of Organic Dyes Degradation in Water Using Vacuum Ultra Violet Radiation
In this study vacuum ultraviolet (VUV) radiation (185 nm wave length) was used in the presence of atmospheric oxygen as an advanced oxidation technique. Six organic dyes were examined as model pollutants (methyl violet, methyl blue, brilliant green, malachite-green, Remazole blue B and picric acid). Picric acid as the most persistent one was selected for more detailed kinetic investigations. The influence of each of the related main parameters was studied, Radiation time, salinity, pH, temperature and radiation intensity. Kinetics of the oxidation reaction was studied. COD was also followed up. It follows from the results that vacuum-UV radiation of 185 nm in the presence of atmospheric oxygen is an efficient method for the oxidation process. Four of sex examined dyes were degraded in different rates according to persistency of each pollutant dye. The reaction rates were in the order of: (methyl violet > methyl blue >brilliant green > remazole > malachite green> picric acid). In the case of picric acid; the reaction was promoted by rising the temperature, raising or lowering pH above and below pH 7.0, increasing radiation dosage. The rate was inhibited by increasing salinity and buffering. The present technique was found promising in the elimination of the persistent organic pollutants out of the treated water.
(Advanced oxidation process; Vacuum ultraviolet; Wastewater treatment; Radiochemistry; Organic pollutants).
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