Journal
ENVIRONMENTAL TECHNOLOGY
Volume 22, Issue 7, Pages 813-822Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/095933322086180323
Keywords
textile industry effluent; reactive dyes; advanced oxidation processes; TiO2-mediated heterogenous photocatalysis; Fenton and Photo-Fenton oxidation
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Two commercial reactive dyes, the azo dye Reactive Black 5 and the copper phythalocyanine dye Reactive Blue 21, have been treated at a concentration of 75 mg l(-1) by titanium dioxide mediated photocatalytic (TiO2/UV), dark and UV-light assisted Fenton (Fe2+/H2O2) and Fenton-like (Fe3+/H2O2) processes in acidic medium. For the treatment of Reactive Black 5, all investigated advanced oxidation processes were quite effective in terms of colour, COD as well as TOC removal. Moreover, the relative growth inhibition of the azo dye towards the marine algae Dunaliella tertiolecta that was initially 70%, did not exhibit an increase during the studied advanced oxidation reactions and complete detoxification at the end of the treatment period could be achieved for all investigated treatment processes. However, for Reactive Blue 21, abatement in COD and UV-VIS absorbance values was mainly due to the adsorption of the dye on the photocatalyst surface and/or the coagulative effect of Fe3+/Fe2+ ions. Although only a Limited fraction of the copper phythalocyanine dye under-went oxidative degradation, 47% of the total copper in the dye was already released after 1 h photocatalytic treatment.
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