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Durham University

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Publication details for Professor Karen Johnson

Clarke, Catherine E. & Johnson, Karen L. (2010). Oxidative breakdown of acid orange 7 by a manganese oxide containing mine waste: Insight into sorption, kinetics and reaction dynamics. Applied Catalysis B: Environmental 101(1-2): 13-20.

Author(s) from Durham


The reaction rates and orders of azo dye, acid orange 7 (AO 7), oxidation by a Mn oxide containing mine tailings were determined. The reaction is pseudo-first order with respect to the tailings surface area concentration [SA] and pseudo-fractional (0.6) order with respect to AO 7 concentration. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy was used to probe surface sorption and oxidation of AO 7 on a synthetic manganite surface. Sorption is rapid, pH dependent and predominantly outer-sphere. At pH 2.7 a distinct lag phase of 8 min has been observed between dye sorption and the initiation of oxidation. This lag phase suggests that either transfer of the first electron is rate limiting or there is a time consuming re-orientation and inner-sphere sorption step prior to electron transfer.