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 mol8226;L-1 NaCl

0.1 mol8226;L-1 Na2SO4

0.1 mmol8226;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.