Decolorization and mineralization of a phthalocyanine dye C.I. Direct Blue 199 using UV/H2O2 process

  • Shu H
  • Chang M
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Abstract

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/H2O2, 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 20 mg l-1, hydrogen peroxide dosage of 116.32 mM, UV dosage of 560 W and pH of 8.9 in 30 min. 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 0.15 min-1was observed while hydrogen peroxide concentration within 5.82-116.32 mM. 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. © 2005 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Advanced oxidation processes (AOPs)
  • Decolorization
  • Mineralization
  • Phthalocyanine dye
  • UV/H2O2
  • Ultraviolet

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Authors

  • Hung Yee Shu

  • Ming Chin Chang

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