Abstract

In this study, three textile dyesare destroyed by ozone in water solution. These dyes were selected because oftheir complex chemical structure and extended application in textile industry.Decomposition of dyes by simple ozonation was observed at the initial pH of theaqueous colorants solutions UV-VIS analysis was used for preliminary control ofthe degree of decomposition. HPLC analysis was used to identify intermediatesand final products formed during ozonation. It was shown that color disappearscompletely for all dyes after 1.5 - 2 min of ozonation. The pre-ozonated waterwas used for the preparation of colorant solutions until 8 times. The dyeingquality (using pretreated solutions) was determined by the standard AATCCmethod. In the water pre-ozonation byproducts accumulation was observed, buttheir presence in the solution did not affect the color quality. The ozonationof dyes solutions has not any influence on the coloration quality in 6 timeswater recirculation for DR28 and BG4, and in 8 times water recirculation forRB5. After several times of water recirculation ozonation procedure wasconducted during 20 min to destroy intermediates. Dyes are completely destroyedin ozonation with the formation of final products (malonic and oxalic acids).

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