Abstract：Electrolytic manganese slag was used as photocatalyst to construct heterogeneous photo-Fenton reaction system. Bisphenol S was used as a model compound to study the degradation mechanism and influencing factors for bisphenol S in the reaction system. The formation rate model of •OH were constructed in the photo-Fenton reaction system. Based on ·OH formation rate model, the prediction model of bisphenol S considering the effect of dissolved organic matter (DOM) were established. The results showed that the mass contents of Fe and Mn in electrolytic manganese with catalytic activity were 1.49% and 2.28% respectively. Compared with other degradation system (i.e., UV, UV/electrolytic manganese slag, UV/H2O2 and electrolytic manganese slag/H2O2 system), the electrolytic manganese slag/UV/H2O2 photo-Fenton system exhibited excellent oxidation degradation efficiency for bisphenol S, and the degradation efficiency of bisphenol S was positively correlated with the dosage of electrolytic manganese slag and H2O2 concentration, but negatively correlated with pH and initial concentrations of bisphenol S. The concentrations of Fe and Mn in the solution was negatively correlated with the pH value, and the coexisting active metal components in the reaction leaching from electrolytic manganese slag were not conducive to the degradation of bisphenol S. Electron spin resonance and radical quenching experiments showed that the main active species for bisphenol S degradation in electrolytic manganese slag/UV/H2O2 system was •OH. The formation rate model of •OH in this system was constructed by using isopropanol, and the formation rate of •OH was estimated to be 3.22×10-9~1.1×10-8mol/(L·s), which was consistent with R·fOH (6.5×10-9mol/(L·s)) calculated by nitrobenzene fitting. The degradation efficiency of bisphenol S decreased with the increase of DOM concentrations. Based on the theory of free radical steady-state kinetics, a kinetic prediction model of bisphenol S degradation in electrolytic manganese slag/UV/H2O2 system in the presence of DOM was established. It was found that the predicted values from the model was in line with the experimental data, indicating that DOM mainly affected the degradation of bisphenol S through quenching •OH in the system.
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