A perovskite catalyst Ca0.9CuO3-δ with A-site deficiency and rich oxygen vacancies was synthesized via the sol-gel method and applied for the catalytic ozonation degradation of tetracycline (TC) in water.The morphology,structure,and electrochemical properties of the catalyst were systematically analyzed using multiple characterization techniques.The effects of factors such as A-site deficiency,ozone concentration,catalyst dosage,initial TC concentration,pH,and inorganic anions on the degradation performance were investigated.The results showed that Ca0.9CuO3-δ with an appropriate A-site deficiency exhibited high crystallinity,abundant oxygen vacancies,and excellent electron transfer capability,leading to the best catalytic performance.Under the conditions of an ozone concentration of 12 g/Nm3,catalyst dosage of 0.50 g/L,initial TC concentration of 200 mg/L,and original water pH (6.23),the COD removal rate reached 91.35% after 90 minutes of reaction.Free radical trapping and EPR experiments indicated the presence of multiple reactive species (·$\mathrm{O}_2^{-}$,·OH,and 1O2) in the catalytic ozonation system,which collectively contributed to pollutant degradation.This study provides a theoretical basis and technical reference for the application of defect-engineered perovskite catalysts in the catalytic ozonation degradation of antibiotic wastewater.
COD浓度利用COD快速测定仪(连华科技)检测。量取2.50 mL待测样品,依次加入4.80 mL LH-D试剂、0.70 mL LH-E试剂;样品混合均匀后使用消解仪[连华科技,5B-IB(VB)]消解10 min;向样品加入2.50 mL去离子水,经COD快速测定仪(连华科技,5B-3C)测定COD浓度。
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