Photocatalytic degegradation of bromocresol green by TiO2/UV in aqueous medium

The synthetic dyes currently occupy an important place in the industrial sector. they are widely used in the textile,paper,plastic and leather. the release of large quantities of these dyes in the environment can lead to non negligible pollution of the latter. the heterogeneity of their composition makes it difficult or almost impossible,obtaining pollution limits lower than those imposed by the environmental standards after treatment with traditional techniques such as biodegradation. thus,there is an urgent need for developing more efficient techniques,that among these techniques,there is the advanced oxidation processes. this study aims to investigate the discoloration of bcg photocatalysis by tio2 (pc 500) in aqueous solution. we then determined the optimum operating conditions such as the addition of h2o2,effect of catalyst concentration,type of tio2 and the initial concentration of the pollutant on the photodegradation rate. the experimental results show that the heterogeneous photocatalysis of tio2 was effective in discolors bromocresol green. in conclusion,it can be argued that the heterogeneous photocatalysis is an efficient technique for bleaching of the dye in an aqueous medium.