Pachhade K, Sandhya S, Swaminathan K
National Environmental Engineering Research Institute, Council of Scientific and Industrial Research (CSIR) Complex, Taramani, Chennai, India.
J Hazard Mater. 2009 Aug 15;167(1-3):313-8. doi: 10.1016/j.jhazmat.2008.12.126. Epub 2009 Jan 10.
Ozonation of aqueous solution of Procion red MX-5B, a commercial azo reactive dye was investigated. The effect of various experimental variables on decolorization and degradation of the dye has been studied. Color removal was faster than organic removal. Dye mineralization was evident by the generation of sulphate, chloride, nitrate, oxalic and acetic acid during ozonation. The decolorization and organic removal followed pseudo-first-order kinetics. Among the metal ions studied, manganese catalyzed ozonation showed better decolorization and organic removal. Fourier transform infrared (FTIR) spectroscopy results indicated the disappearance of bands for aromatics and appearance of bands due to carboxylic acids in the ozonated samples. Acetyl benzoic acid, diethyl phthalate and phthalic anhydride were identified as intermediates by gas chromatography mass spectra (GC/MS). Based on these findings a tentative pathway for the degradation MX-5B was postulated.
对一种商业偶氮活性染料普施安红MX - 5B的水溶液进行了臭氧化研究。研究了各种实验变量对该染料脱色和降解的影响。脱色比有机物去除更快。臭氧化过程中硫酸盐、氯化物、硝酸盐、草酸和乙酸的生成表明染料发生了矿化。脱色和有机物去除遵循准一级动力学。在所研究的金属离子中，锰催化臭氧化表现出更好的脱色和有机物去除效果。傅里叶变换红外（FTIR）光谱结果表明，臭氧化样品中芳烃谱带消失，出现了羧酸谱带。通过气相色谱 - 质谱联用（GC/MS）鉴定出乙酰苯甲酸、邻苯二甲酸二乙酯和邻苯二甲酸酐为中间体。基于这些发现，推测了MX - 5B的降解途径。
