Catalytic Effect of Cyclohexanone Combined with Chloride Ion Activation of Peroxomonosulfate to Degrade Acid Orange 7
2022
Wu, Wei | Duan, Huike | Chen, Jiabin | Xu, Jie | Xu, Fen | Huang, Tianyin | Xu, Xiaoyi
In this study, the azo dye acid orange 7 (AO7) was degraded by synergistic activation of persulfate (PMS) with cyclohexanone/chloride ion (Cl⁻). The effects of cyclohexanone dosage, PMS concentration, Cl⁻ concentration, initial pH, temperature, and aqueous natural organic matter (NOM) on the AO7 removal were investigated. Under alkaline conditions, the removal rate of AO7 increased with increasing cyclohexanone and Cl⁻ concentrations. The degradation rate of AO7 was unaffected by the water matrix and NOM in the environment. As shown in radical quenching experiments and electron paramagnetic resonance spectroscopy analysis, the main reactive species generated in the reaction system were hypochlorous acid (HCIO) and singlet oxygen (ˡO₂), which destroyed the azo bond and naphthalene ring structure in AO7. Judging from its ability to degrade AO7, the cyclohexanone/Cl⁻/PMS system is suitable for treating high-salt wastewater containing organic pollutants.
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