Dicolorization of Reactive Dyes in Aqueous Solutions Using Ionizing Electron Beam Radiation

Experiments were carried out to study the effects of high-energy electron beam irradiation on reactive azo dyes (Remazol blue 133%, and Remazol red) which are widely used in Yazd textile plants. Laboratory scale experiments were carried out using advanced 10 MeV electron beam accelerator service in Yazd Radiation Processing Center (YRPC). The irradiation dose was varied over 1, 3, 5, 8, and11 kGy. Dicoloration of the prepared dye solution was monitored by comparing the absorption spectra of the samples before and after irradiation. Mineralization of the dye solutions were estimated by measuring COD and PH of the irradiated samples. Our results show a color removal efficeincy of 83% in from different samples by applying 1 kGy irradiation dose. This value increases by up to 96%  under 3kGy irradiation. pH and COD values decrease with increasing absorbed doses.  COD removals for Remazol blue 133% and Remazol  red samples were calculated as 20% and 18% for an absorbed dose of 1 kGy and 60% and 72% for an absorbed dose of 11 kGy, respectively.