Degradation of anthraquinone dye C.I. Reactive Blue 19 in aqueous solution by ozonation |
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Authors: | Jen-Mao Fanchiang Dyi-Hwa Tseng |
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Institution: | aGraduate Institute of Environmental Engineering, National Central University, Jhongli 320, Taiwan, ROC |
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Abstract: | This study investigated the degradation of anthraquinone reactive dye C.I. Reactive Blue 19 (RB-19) with initial concentration of 100 mg L−1 in aqueous solution by ozone oxidation. The results of UV/VIS and FTIR spectra showed that the anthraquinone structures, nitrogen linkages and amino groups of RB-19 were destroyed under direct ozone reaction. The identification by LC–MS and GC–MS analyses indicated that some organic acids (e.g., phthalic acids) and 1,3-indanone could be the primary degradation products, respectively. The Microtox toxicity of the ozonated RB-19 solution initially increased but subsequently decreased when ozonation time increased. This detoxification accompanied biodegradability enhancement revealed by BOD/COD ratio increasing from 0.15 to 0.33 after 10 min of ozonation. |
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Keywords: | Anthraquinone reactive dye Ozonation Intermediate products Degradation pathway Microtox toxicity |
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