Abstract
In this study, a novel α-Fe2O3/V2O5/BC catalyst with highperoxymonosulfate (PMS)activation performance was constructed by co-pyrolysis method and 99.58% of tetracycline is degraded within 120 min. The electrons conversion of Fe-V on biochar surface induces the continuous generation of sulfate radicaland singlet oxygen molecules (1O2).The XPS results show that it is Fe3+and Fe0rather than Fe3+and Fe2+in the iron cycle after the introduction of vanadium, indicating a more efficient electron transfer efficiency between interface. The optical properties characterization and density function theory calculation (DFT) of α-Fe2O3/V2O5/BC reveal that the electrons of the entire α-Fe2O3and the vanadium atoms are redistributed to new molecular orbitals due to strong interfacial chemical bonding, inducing a direct transfer of electrons to generate1O2for tetracycline removal that is the main cause of selective degradation. Besides, the possible degradation mechanism and tetracycline degradation pathways were also proposed. The α-Fe2O3/V2O5/BC maintains a high removal efficiency of tetracycline only decrease by 7.09% after six cycles. This study provides a better strategy and recyclable purification material for the efficient treatment of antibiotic pharmaceutical wastewater.
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