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Kinetics and products of ozonation of c.i.reactive red 195 in a semi-batch reactor

c.i.ese chemical Letters 2015年第1期26卷 93-99页

作者： Rui Zhang Dong-Xing Yuan Bao-Min Liu college of the Environment & Ecology Xiamen University State Key Laboratory of Marine Environmental Science Xiamen University

Textile wastewater shows great threats to the environment if not well pretreated before discharge. A promising technique, ozonation, was applied to remove the color in dye solutions containing c.i. reactive red 195 （RR195） in a semi-batch reactor. The decolorization of RRi95 by the ozone process followed pseudo-first-order kinetics. Several factors which influenced the efficiency of decolorization were studied and the reac.i.n rate constant （k） obtained with different operational parameters was compared. Our results showed that RRi95 was more easily degraded in acidic than in alkaline conditions. The dyeing auxiliaries （sodium carbonate and sodium chloride） that acted as radical scavengers could enhance the decolorization process, and the ozonation time for total color removal lengthened if the initial dye concentration was higher. The analysis of the ozonation products was performed by liquid chromatography-tandem mass spectrometer and a possible degradation pathway was predicted according to the ozonation products and structure of RR195. Our results indicated that ozonation was effec.i.e in the color removal of dyes, but further treatment might be necessary since the ozonation products are high toxic.

关键词： Ozonation c.i. reactive red 195 Decolourization Kinetics Degradation pathway

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