MOF-derived FeOOH-MnOx activated permonosulfate to degrade tetracycline hydrochloride
Using the metal-organic framework(Mn-MOF-74)as a precursor,FeOOH-MnOx was prepared by introducing Fe2+through calcination and used as an efficient catalyst for peroxymonosulfate(PMS)activation to degrade tetracycline hydrochloride(TCH).Characterizations using X-ray powder diffractometry(XRD)and scanning electron microscopy(SEM)confirmed the interwoven polyhedral structure of the catalyst.BET test showed that the specific surface area of FeOOH-MnOx was about 2.25 times greater than that of the precursor,which provided conditions for exposing more active sites.Under the optimal reaction conditions(10mg/L TCH,0.1 g/L catalyst,1mmol/L PMS),the TCH removal rate of 92.5％in FeOOH-MnOx/PMS system was achieved.Additionally,superior stability and adaptability of the catalyst were demonstrated in the presence of inorganic ions and real water environments.The results of electron paramagnetic resonance(EPR)and quenching experiments indicated that O2·-was identified as the main reactive oxidative species in the degradation system.XPS results were shown to indicate the successful introduction of Fe2-,and the coexistence of Fe and Mn was found to promote the conversion of Mn(Ⅲ)/Mn(Ⅱ)and Fe(Ⅲ)/Fe(Ⅱ),which accelerated the electron transfer rate and further improved the catalytic performance.
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