Study Of Reaction Mechanism Of Reactive Dark Blue B-2GLN By Fenton Oxidation And Complex Ultraviolet And Hydrogen Peroxide Process

Online spectrophotometric method was employed to monitor simulated Reactive Dark Blue B-2GLN(RDB B-2GLN) in aqueous solution in Fenton oxidation process. The dye degradation effects of initial dosage of Fe SO4 and H2O2, p H value, initial concentration of dye and H2O2/Fe2+ molar ratio have been studied.The kinetic mechanics was estimated, the products of Fenton oxidation were analyzed by Ion Chromatography method(IC) and gas chromatography-mass spectrometer(GC-MS). The results show that online spectrophotometric method is a quick, feasible and convenient technique to monitor color removal of RDB B-2GLN in Fenton process, Fenton oxidation process for the treatment of RDB B-2GLN consists of two stages, and the degradation is very fast at the first stage. In the second stage( ≥ 25 s), decolorizing rate is significantly retarded with the reaction time extending;The optimal dosage of H2O2 and p H is 2.635 m M and 2.7, respectively. The optimal dosage of Fe2+ for color removal is 0.0696 m M,the mole ratio of H2O2 to Fe2+ is37.8; under the preparation conditions of the optimum dosage, the color removal rate of Reactive Dark Blue B-2GLN is around 85.04% after 300 s.; The intrinsic reaction rate constant of ?OH with RDB B-2GLN in aqueous solution is 2.6×1011M-1s-1. The molecule structure of RDB B-2GLN is decomposed and not mineralized by Fenton’s reagent(300 s).UV/H2O2 was employed to treat Reactive Dark Blue B-2GLN(RDB B-2GLN) in aqueous solution. The effects of hydrogen peroxide dosage p H value, initial dye dosage,and different anions on color removal were studied in detail. The online spectrophotometric method was used to record the change of RDB B-2GLN dye absorbance at different reaction time in aqueous solution. The results show that RDB B-2GLN can be completely decomposed in 40 min and the optimum operating conditions of the method were found to be 8.0 m M H2O2 dosage, initial dye 16 mg L-1 at p H 5.3. Under these conditions, a maximum of 86.10% decolorization of the dye was achieved. The various anions inhibiting effect on dye decolorization follows the descending order: CO32- > PO43- > HPO42- >Cl-.The molecule structure of RDB B-2GLN may be decomposed and mineralized with UV/H2O2 process by ion chromatography(IC) analysis.