Photochemical and heterogeneous photocatalytic degradation of waste vinylsulphone dyes: A case study with hydrolyzed Reactive Black 5

Idil Arslan Alaton, Işil Akmehmet Balcioglu

Research output: Contribution to journalArticlepeer-review

136 Citations (Scopus)

Abstract

Aqueous solutions of hydrolyzed Reactive Black 5 (RB5) dye, a well-known surrogate for non-biodegradable azo dyes, were photochemically and photocatalytically treated by employing the H2O2/UV-C and TiO2/UV-A advanced oxidation systems, respectively. The observed effects of reaction pH, oxidant dose and initial dyestuff concentration were used to explain the OH· induced color disappearance kinetics empirically. Accordingly, the waste dyestuff solutions could be completely decolorized (kd, max=0.155min-1; H2O2/UV-C system) and effectively mineralized (kTOC, max=0.01min-1; H2O2/UV-C system), with an average overall TOC removal of 78% after 120min advanced oxidation at the specified optimized reaction conditions. The treatment via H2O2/UV-C was mainly governed by OH· type oxidation rather than direct UV-C or UV-A photolysis, and the bleaching effect of the TiO2/UV-A process could be successfully fitted to the empirical Langmuir-Hinshelwood (L-H) kinetic model (kL-H=4.47mgl-1min-1; KL-H=2.01lmg-1).

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume141
Issue number2-3
DOIs
Publication statusPublished - 2 Jul 2001
Externally publishedYes

Funding

This study was a part of Project no. 98Y-03, that is financially supported by Bogaziçi University Research Fund.

FundersFunder number
Bogaziçi University

    Keywords

    • Advanced oxidation processes (AOPs)
    • HO/UV-C treatment
    • Langmuir-Hinshelwood type kinetic equation
    • Reactive Black 5
    • Textile dyestuffs
    • TiO/UV-A treatment

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