摘要：Catalytic activation of peroxymonosulfate (PMS) for purifying organic wastewater has been widely studied. However, the activation mechanism either by free radicals or non-radicals alone is not satisfactory efficiency. In this work, a novel advanced oxidation system based on surface oxidized metallic cobalt nanoparticles (Co@CoO) encapsulated with N-doped carbon nanotubes (NCT), i.e., CCN, activated peroxymonosulfate (PMS) was designed. The CCN-PMS system showed excellent performance in the degradation for a wide range of organic pollutants, including antibiotics, dyes, and phenols. The degradation rate of 100 mL 80 mg·L-1 tetracycline hydrochloride (TC) in the system (10 mg CCN + 0.5 mM PMS) reached 92% within 30 min. The mechanism analysis of the CCN activation of PMS reveals that the NCT mainly provided the active sites for non-radical formation, while the Co@CoO mainly provided the active sites for radical formation. In addition, the NCT could not only effectively reduce the leaching of Cox+, but also play a synergistic role with Co@CoO in the degradation of organic pollutants. This work provides new insight into the mechanism of PMS activation by carbon-based catalysts for the efficient purification of organic wastewater.

期刊：Separation and Purification Technology（中科院一区，JCR Q1，IF= 9.136）