Gamma radiation induced degradation of anthraquinone Reactive Blue-19 dye using hydrogen peroxide as oxidizing agent

Publication date: Available online 6 December 2019Source: Radiation Physics and ChemistryAuthor(s): Rabia Arshad, Tanveer H. Bokhari, Kaleem K. Khosa, Ijaz A. Bhatti, Majid Munir, Mazhar Iqbal, Dure N. Iqbal, M.I. Khan, Munawar Iqbal, Arif NazirAbstractThe gamma irradiation-induced degradation of a reactive dye Reactive Blue-19 (RB-19) as a model system in aqueous media has been evaluated. The process variables such as dye initial concentration (50–150 ppm), H2O2 concentration (0.1–0.9 ml) and gamma radiation absorbed dose (1–12 kGy) were optimized to get maximum degradation. The efficiency of AOP was assessed on the basis of degradation, reduction in COD/BOD and toxicity of the dye. A complete degradation and 60% removal in COD/BOD were obtained at H2O2 (0.9 ml) under the gamma radiation absorbed dose of 12 kGy. The UV/Vis spectrophotometer was used to investigate the change in absorbance before and after irradiation. The radiolytic progress and degraded end-products of the treated samples were determined by comparing the before and after irradiation dye spectra of FT-IR. The results of FTIR spectra showed that the anthraquinone structures, nitrogen linkages and amino groups of RB-19 were destroyed under gamma irradiation. The identification by LC-MS analyses indicated that some organic acids (e.g. phthalic acid) could be the primary degradation products. The hemolytic test showed 19.30% hemolysis, while gamma/H2O2 treatment reduced mutagenicity from 89.7% to...
Source: Radiation Physics and Chemistry - Category: Physics Source Type: research