Enhanced removal of sulfamethoxazole via peroxymonosulfate activated by the Co-Cu bimetallic oxide
Co-Cu bimetallic oxide was used as a catalyst for the activation of peroxymonosulfate(PMS)to degrade sulfamethoxazole(SMX)in water.The morphology and elemental composition of the as-prepared catalyst were characterized by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),and X-ray diffraction(XRD).In the catalytic system,95.6％of SMX was removed within 30 min when the pH was 7.0,the catalyst dosage was 50 mg·L-1,and the PMS concentration was 0.5 mmol·L-1.The removal of SMX was accelerated with increasing PMS concentration and catalyst dosage.FA and HCO3-had an inhibitory effect on the removal of SMX,while Cl-and SO42-exhibited no significant impact.Quenching experiments and electron paramagnetic resonance(EPR)results indicated that sulfate radicals(SO4-)and singlet oxygen(1O2)were the main reactive oxygen species(ROS)in the Co-Cu/PMS system.The XPS peak results indicated that the Cu+/Cu2+cycle played an important role in the PMS activation of the Co-Cu.
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