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- W2965958045 abstract "The homogeneous catalytic ozonation, through the addition of dissolved metal ions, acting as catalysts, was applied for the removal/degradation of small concentrations of p-CBA, used as model micropollutant, from aqueous solutions. For this purpose five different transition metal ions, i.e. Co(II), Fe(II), Mn(II), Ni(II) and Zn(II), were studied at pH 7 and concentrations ranges of 0.25–1 mg/L. It was found that only the application of O3/Co(II) and O3/Fe(II) systems can be characterized as effective catalytic ozonation processes. The addition of these metals resulted in 95.5% and 92.5% p-CBA degradation respectively, mainly due to the low solubility of respectively formed oxy-hydroxides (Co(OH)3 and Fe(OH)3). These oxy-hydroxides are relatively hydrophobic and positively charged at pH 7, whereas the respective aquatic species, i.e. Co(OH)2+ and Fe(OH)2+, can also favor the attraction of negatively charged p-CBA. The optimum conditions for both metal ions were: catalyst concentration 1 mg/L, ozone concentration 2 mg/L and pH value 8, where p-CBA residual concentration was found to diminish below the respective analytical detection limit of 0.025 μM after only 3 min of reaction/oxidation time. Additionally, it was found that the presence of Co(II) and Fe(II) can increase the decomposition of ozone, as well as the production of hydroxyl radicals, hence resulting in faster and more effective p-CBA degradation in comparison to single ozonation (i.e. without the presence of catalytically acting dissolved metal cations)." @default.
- W2965958045 created "2019-08-13" @default.
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- W2965958045 date "2019-10-01" @default.
- W2965958045 modified "2023-09-26" @default.
- W2965958045 title "The role of metal ions on p-CBA degradation by catalytic ozonation" @default.
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- W2965958045 doi "https://doi.org/10.1016/j.jece.2019.103324" @default.
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