DEGRADATION STUDIES OF REACTIVE DARK BLUE B-2GLN BY COMPLEX ULTRAVIOLET AND HYDROGEN PEROXIDE

摘要

UV/H2O2 was employed to decompose Reactive Dark Blue B-2GLN (RDB B-2GLN) in aqueous solution. The effects of hydrogen peroxide dosage, pH value, initial dye dosage, and different anions on colour removal were investigated in detail. The online spectrophotometric method was applied to monitor the change of RDB B-2GLN dye absorbance at different reaction times in aqueous solution. The results show that RDB B-2GLN was completely decomposed within 40 min, and the optimum operating conditions of the method were found as 8.0 mM of H2O2 dosage, initial dye concentration of 16 mg L-1 at pH 5.3. Under these conditions, a maximum of 86.10% decolorization of the dye was achieved. The various anions inhibiting the effects on dye decolorization follow the descending order: CO32-> PO43-> HPO42->Cl-. The molecular structure of RDB B-2GLN may be decomposed and mineralized with UV/H2O2 process by IC analysis.