Efficient degradation of tetrahydrofuran in water by constructing heterogeneous H2O2 activation system based on Fe-based MOFs
To overcome the defects of narrow pH range,low activation efficiency of H2O2 and non-recyclability of Fe2+in homogeneous photo-fenton system,the Fe-based MOFs material MIL-53(Fe)was prepared to construct a heterogeneous and efficient H2O2 activation system,and characterized by XRD,XPS and UV-vis diffuse reflection to investigate the performance and mechanism of THF removal by MIL-53(Fe)/UV/H2O2 system.The degradation experiments results showed that the degradation efficiency of MIL-53(Fe)/UV/H2O2 system was 2.4 times higher than that of UV/H2O2,and its pseudo-first-order degradation rate constant(0.0487 min-1)was 2.375 times higher than that of UV/H2O2 system(0.0205 min-1),the best degradation efficiency was achieved at pH ≈ 6.8(raw water),H2O2 addition of 20 mmol·L-1 and MIL-53(Fe)dosing of 0.1 g·L-1,reaching 94.7%within 50 minutes;the intermediate products were identified by LC-MS analysis and a possible THF degradation pathway was proposed and verified by DFT calculation using Gaussian software;the biodegradability of the solution was improved from weak to strong before and after degradation was demonstrated in four aspects:OUR,BOD5/COD,AOS(Advanced Oxidation State)and COS(Carbon Oxidation State);combined with the active species quenching experiment,blinding experiment of Fe3+,e-and the valence/conduction band analysis,the potential THF degradation mechanism was proposed,which verified that·OH was the most important active species in the THF degradation process,and photogenerated e-was the main driver of the increasment of reaction rate.
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