Azo dye degradation by high-energy irradiation: kinetics and mechanism of destruction
نویسنده
چکیده
Azo dyes are produced in very large quantities and used as reactive dyes by the cotton industry. They are very stable and resistant to chemical processes. Therefore, their removal from industrial effluents by conventional methods (mechanical screening, sedimentation, biological treatment, biofilters) alone is usually not very effective. This problem can be solved by combining the conventional techniques with other methods. Radiation chemistry is one of the most promising advanced oxidation processes (AOP’s) [3, 8, 9] for environmental remediation. In AOP’s hydroxyl radicals are the main oxidants for the degradation of organic pollutants [13]. The disappearance of the dye is generally followed by spectrophotometry at the absorbance maximum between 450 and 600 nm. The dye disappearance curves are very often described by applying some kinetic equations [4, 6, 7, 10, 15, 17−19] in order to describe the dependence of the destruction on such parameters as dose, dose rate, additives, etc. in radiolysis experiments, illumination intensity, illumination time, etc. in photo oxidation experiments [15]. For the present mechanistic and kinetic studies, the experimental results obtained during radiolysis of Apollofix Red (AR-28) and Reactive Black 5 (RB-5) are discussed. Some of the experimental results were already published [16, 20, 21]. Azo dye degradation by high-energy irradiation: kinetics and mechanism of destruction Erzsébet Takács, László Wojnárovits, Tamás Pálfi
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