Enhanced degradation of 4-Cholophenol by activation of peroxymonosulfate with Fe-MOF@Mn2O3: Performance and mechanism

There has been growing attention in the combination of metal oxide nanoparticles with metal-organic frame-works (MOFs) for the synergistically intensified catalytic activity. Herein, functional Fe-MOF@Mn(2)O(3 )composites were synthesized to activate peroxymonosulfate (PMS) for 4-Cholophenol (4-CP) degradation via a hydrothermal and calcination method. Under the reaction parameters of 2 mM PMS, 0.2 g/L catalyst dosage, and pH 7.0, 91.4% of 4-CP (10 mg/L) could effectively be degraded within 60 min (2.2-fold increase in reaction rate constant compared with pure Mn2O3). The excellent degradation performance of Fe-MOF@Mn2O3/PMS system was attributed to the surface hydroxyl and synergistic effect between iron and manganese. Quenching reaction and EPR analysis revealed both sulfate (center dot SO4-) and hydroxyl radicals (center dot OH) were responsible for 4-CP degradation. The Fe-MOF@Mn(2)O(3)composite exhibited intensive catalytic capability as well as electron transfer efficiency according to the electrochemical measurements. Meanwhile, the possible degradation pathways were proposed by analyzing intermediates via LC-MS detection. The results indicates that the Fe-MOF@Mn2O3/PMS system is effective and adaptable for the treatment of 4-CP in different water conditions.

Automated summary

In this study, functional Fe-MOF@Mn(2)O(3) composites were synthesized for the activation of peroxymonosulfate (PMS) to degrade 4-Cholophenol (4-CP). The Fe-MOF@Mn2O3/PMS system exhibited excellent catalytic performance due to the surface hydroxyl and synergistic effect between iron and manganese. The involvement of sulfate and hydroxyl radicals in the degradation of 4-CP was confirmed through quenching reaction and EPR analysis. The electrochemical measurements and LC-MS analysis provided insights into the catalytic capability and degradation pathways of the composite material.