Decolorization and Mineralization of Acid Orange Ⅱ by NaClO Oxidation
BI Hui-feng FAN Rui YANG Wei-shen YANG Feng-lin (Laboratory of Environmental Electrochemistry, School of Environmental & Biological Science and Technology, Dalian University of Technology, Dalian 116024)
Chemical oxidation method for treatment of a simulated azo dye wastewater containing Acid orange Ⅱ (C.I. Acid Orange 7) was studied using NaClO as an oxidant. The absorbances at 484nm, 310nm and 255 nm were measured to follow the decolorization process of the dye. It was supposed that the mechanism of oxidation of Acid Orange Ⅱ was a consecutive reaction .The effects of key factors, such as dosage of NaClO, concentration of the dye, temperature and pH were to be investigated. The results showed that when the concentration of Acid Orange Ⅱ was 0.1mmol L-1, mole ratio(NaClO/dye) =18, T=30℃,after 30mins., the ratio of color removal approaching 100% . pH strongly affected the mineralization of the dye. Under alkali condition, the removal of TOC could be as much as 50%; but under acidic or neutral conditions, TOC was low.
【CateGory Index】： X788