UV-assisted degradation of tetracycline hydrochloride by MnFe2O4@activated carbon activated persulfate
The magnetic catalyst MnFe2O4@AC(MFA)was synthesized using a water bath-inverse co-precipitation method and was systematically characterized to assess its structural and magnetic properties.The results indicated that MnFe2O4 nanoparticles were successfully encapsulated on the surface of activated carbon(AC),resulting in a multistage pore structure.Although the specific surface area of MFA decreased compared to that of the AC base material,it remained high at 176 m2·g-1,with an average pore size of 8.49 nm.The specific magnetization intensity of MFA reached 38.92 emu·g-1,enabling high-efficiency solid-liquid separation when subjected to an external magnetic field.Tetracycline hydrochloride(TC)was degraded using activated peroxymonosulfate(PMS)with UV-assisted activation,employing MFA as a catalyst.The degradation rate of TC in the MFA/PMS system under UV irra-diation achieved 97.70％,which was 1.2 times that of the system without UV irradiation.The presence of coexisting anions,the pharmaceutical matrix,and the initial mass concentration of TC significantly influenced the catalytic per-formance of the system.Notably,the degradation rate remained at 82.76％after five cycles.Free radical burst exper-iments revealed that superoxide radicals(·O2-)and monoclinic oxygen(1O2)were the primary reactive oxygen spe-cies in the UV-assisted MFA/PMS advanced oxidation system.Mechanistic analysis indicated that the high adsorp-tion capacity of MFA provided a solid foundation for catalytic degradation,and the synergistic effect of UV irradia-tion with the MFA/PMS advanced oxidation system significantly enhanced the generation efficiency of reactive spe-cies,thereby facilitating the degradation of organic molecules.
advanced oxidationpersulfateultraviolet light assistedactivated carbonferritereactive oxygen species
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