Removal of some dyes from industrial effluents by polymeric materials and gamma-irradiation

The radiolysis of two basic dyes (Astrazon Red 6B and Astrazon Blue BG-200% ), was investigated as a function of dye concentration, pH, irradiation dos e and dose rats. It was found that the Astrazon Red 6B dye showed more radi ation deradation than the Astrazon Blue BG-200% dye. Combining irradiation with the conventional treatment enhanced the degree of degradation. Additio n of oxygen or hydrogen peroxide showed this enhancement, while nitrogen sh owed no change. A pH drop was observed and may be attributed to the degrada tion of the dye molecules to lower molecular weight compounds such as organ ic acids. Experiments on the adsorption or exchange the dyes onto GAG, some polymeric ion exchange resins and polymeric membranes were carried out sho wing that GAC had the highest adsorption capacity. By combined treatment of irradiation and adsorption, the total removal of these toxic dyes was achi eved.