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Effects Of Chloride Ion On Degradation Of Acid Orange 7 By Sulfate Radical-Based Advanced Oxidation Process: Implications For Formation Of Chlorinated Aromatic Compounds, Ruixia Yuan, Sadiqua Ramjaun, Zhaohui Wang, Jianshe Liu

Dr Zhaohui Wang

Sodium chloride is a common salt used during textile wet processes. Here a dual effect of chloride (i.e. inhibitory and accelerating effect) on azo dye (Acid Orange 7, AO7) degradation in an emerging cobalt/peroxymonosulfate (Co/PMS) advanced oxidation process (AOP) was reported. Compared to OH-based AOPs, high concentrations of chloride (>5 mM) can significantly enhance dye decoloration independent of the presence of the Co2+ catalyst, but did greatly inhibit dye mineralization to an extent which was closely dependent upon the chloride content. Both UV–vis absorbance spectra and AOX determination indicated the formation of some refractory byproducts. Some chlorinated aromatic compounds, …