Catalytic Degradation of Tetracycline in Water by Activation of Peroxymonosulfate Using Epsilon-MnO2/MnFe2O4 as Composite Catalyst
Exploring efficient and sustainable catalysts is the focus of the development of persulfate advanced oxida-tion process.Epsilon-MnO2/MnFe2 O4 complex was synthesized with Fe-Mn spinel MnFe2O4 and ε-MnO2,the micro-structure and morphology were characterized by XRD,SEM,FTIR and XPS.The catalytic degradation performance of ε-MnO2/MnFe2 O4 was investigated by activating peroxymonosulfate(PMS)as a catalyst to degrade tetracycline(TC).The results showed that the catalytic degradation of TC could reach 90.4％in 90 min when 0.1 g/L catalyst was added,PMS dosage was 0.05 g/L,pH was not adjusted and temperature was 25 ℃.After 5 cycles of experi-ments,the degradation efficiency of ε-MnO2/MnFe2O4 activated PMS for TC was still 76.3％,which indicated that the catalyst had good cycle stability.The free radical capture experiments showed that a variety of reactive oxygen species co-contributed to the degradation of TC,such as-OH on the catalyst surface,SO4·-,·OH,O2-and 1 O2,in which the-OH group on the catalyst surface played a leading role.The prepared catalyst activated PMS had good re-moval efficiency for antibiotics in water,and therefore had potential for application.
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