Decolorization and mineralization of a phthalocyanine dye C.I. Direct Blue 199 using UV/H"2O"2 process [An article from: Journal of Hazardous Materials]

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Description:
In this study, the successful decolorization and mineralization of phthalocyanine dye (C.I. Direct Blue 199, DB 199) by an advanced oxidation process (AOP), UV/H"2O"2, were observed while the experimental variables such as hydrogen peroxide dosage, UV dosage, initial dye concentration and pH were evaluated. The operating conditions for 90% decolorization of C.I. DB 199 and 74% removal of total organic carbon (TOC) were obtained for initial dye concentration of 20mgl^-^1, hydrogen peroxide dosage of 116.32mM, UV dosage of 560W and pH of 8.9 in 30min. The pseudo-first order rate constant is a linear function of reverse of initial dye concentration. They linearly increased by incrementing UV dosage, yet were non-linear enhancement by increasing the hydrogen peroxide concentration. A higher pseudo-first order rate constant about 0.15min^-^1 was observed while hydrogen peroxide concentration within 5.82-116.32mM. Moreover, the decolorization of C.I. DB 199 was observed to be more difficult than that of an azo dye, C.I. Acid Black 1, under the same operating conditions.