The catalyst derived from the sulfurized Co-doped metal-organic framework (MOF) for peroxymonosulfate (PMS) activation and its application to pollutant removal

The applications of metal-organic framework (MOF) in advanced oxidation processes (AOPs) for pollutant removal have attracted extensive attention. The new catalyst derived from MOFs for the application in AOPs has not yet been well investigated. In the current study, a highly efficient and stable catalyst for the peroxymonosulfate (PMS) activation was fabricated. The catalyst was derived from the sulfurized Co-doped MOF (SCo-MOF) calcined at different temperature (300-600 ?). In the optimal conditions, the pollutant removal efficiency could reach almost 100 % within 7 min, and the reaction rate constant (k) was 57 times higher than that in the reaction system containing the catalyst derived from the non-sulfurized Co-MOF. The remarkable improvement of catalytic performance of the catalyst was attributed to its reduced charge transfer resistance (R-ct) and the predominant existence of Co(II), which were resulted by the sulfurization and Co doping. In addition, the effects of PMS concentration, catalytic dose and coexisting ions on the pollutant degradation were investigated. Furthermore, the results of the quenching experiments and the electron paramagnetic resonance (EPR) tests showed that the generated SO(4)(& BULL;-)radical during the PMS activation process played key role in pollutant degradation. The OH & BULL;& nbsp; and O-1(2) were the products of the hydrolysis process of SO4 & BULL;-. Besides, the formed O(2)(& BULL;-& nbsp;)was noticed to be an important precursor for the O-1(2) generation. The newly fabricated catalyst for PMS activation could give insight into the SO(4)(& BULL;-& nbsp;)based AOPs applied in wastewater treatment.

Automated summary

The application of metal-organic frameworks (MOFs) in advanced oxidation processes (AOPs) for pollutant removal has attracted significant attention. In this study, a highly efficient and stable catalyst derived from sulfurized Co-doped MOF (SCo-MOF) was fabricated for peroxymonosulfate (PMS) activation. The catalyst showed improved catalytic performance due to reduced charge transfer resistance and the predominant presence of Co(II) resulting from sulfurization and Co doping. Additionally, the study investigated the effects of PMS concentration, catalytic dose, and coexisting ions on pollutant degradation.