Degradation mechanism of methyl orange and phenol by high-temperature modified steel slag activated peroxymonosulfate
In this study,high-temperature modified steel slag was used to activate peroxymonosulfate(PMS)for the degradation of methyl orange and phenol.The effects of steel slag dosages,PMS concentrations,initial pH values and reaction temperatures on the degradation efficiencies of methyl orange and phenol were investigated.The removal efficiencies of methyl orange and phenol reached to 90.5％and 100％after the treatment of 90 min,respectively,under the optimal conditions of 9.0 g/L steel slag,12.0 mmol/L PMS,initial pH 7.0 and reaction temperature 25 ℃.The characterization analysis showed that high-temperature modified steel slag had larger specific surface area and higher porosity,which contributed to preferable catalytic activity and reuse performance.Free radical quenching and EPR experiments confirmed that methyl orange and phenol were degraded by the way of non-free radical(1O2)and free radical(SO4-·and·OH)oxidation,and alkali activating PMS and iron oxide activating PMS played a synergistic effect in the catalytic system.
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