关键词: 电化学氧化, 活性氯, 蒽醌染料, 恒电位

Abstract: The electrochemical oxidation of C.I.Reactive Blue 19 with in situ electrogenerated active chlorine was carried out in a divided flow-by cell using metallic oxide coatings as anode.At a constant potential,measurements of the absorbance at 592 nm and 255 nm were used to follow the discoloration of the dye and degradation of its aromatic ring.The experimental results suggested that the discoloration and degradation were strongly affected by electrode potential,initial pH,concentration of dye and NaCl,while slightly affected by supporting electrolyte concentration and temperature.After 4 h electrolysis at an electrode potential of 1.13 V(vs SCE), for a simulated wastewater composed of 0.5 mol•L^-1 NaCl, 0.1 mol•L^-1 Na₂SO₄, 0.1 mmol•L^-1 dye, the diseoloration of the dye and degradation efficiencies of its aromatic ring were 100%,ca.40%,respectively,while no obvious change of TOC was observed. Indirect electrooxidation by using electrogenerated active chlorine was predominant in the electrochemical oxidation.

Key words: 电化学氧化, 活性氯, 蒽醌染料, 恒电位