Abstract :
The photooxidation of textile dyes Yellow Procion H-4R, Bright Blue Remazol (blue reagent-19), Red Procion HE7B,
and the mixture of the two last dyes were investigated. The efficiency of photooxidation were compared using
hydrogen peroxide (30%) as a bleaching reagent, solar and ultraviolet radiation, common glass borosilicate, quartz
assay tubes, and no solid catalysts. The colour of blue dye and a mixture of blue and red dyes were almost completely
removed after 3 h, either by solar or ultraviolet radiation. The best results of colour removal (93%) for the red and
yellow dyestuffs were obtained only after 6 h, using quartz tubes, hydrogen peroxide and ultraviolet radiation. Using
non-parametrical statistical tests (v2), the treatment showed significant differences among the processes investigated
(P < 0:01).
2004 Published by Elsevier Ltd.
