期刊
CHEMICAL ENGINEERING JOURNAL
卷 471, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.144529
关键词
Zr-Mn composite oxide; Peroxymonosulfate activation; Oxygen mobility; Singlet oxygen
By introducing Zr into MnOX, the oxygen mobility was enhanced, leading to improved performance of PMS catalyst. The Zr-Mn composite oxides exhibited high selectivity and efficiency for the degradation of organic pollutants through a non-radical mechanism. ZM2 sample with a Zr:Mn ratio of 1:1 showed the highest activity, indicating the potential application of this catalyst in wastewater treatment.
Non-radical activation of peroxymonosulfate (PMS) with MnOX can degrade organic pollutants more selectively. However, improving the performance of MnOX is still a challenge. In this work, a series of Zr-Mn composite oxides were synthesized by a hydrothermal method and characterized by various techniques. Their performance for PMS activation was studied using phenol and ofloxacin as the target pollutants. The characterization results show that the introduction of Zr into MnOX increased the oxygen mobility, while the surface area and surface oxygen content of the composite oxides decreased with increasing the content of Mn. The combination of Zr-Mn led to a synergistic effect for PMS activation and the sample (ZM2) with the Zr:Mn ratio of 1:1 exhibited the highest activity. This can be attributed to its high oxygen mobility, suggesting that the manipulation of oxygen mobility should be an effective strategy for improving the performance of PMS catalyst. Singlet oxygen was found to be the reactive species for pollutants degradation, and this process was barely affected by coexisting substances due to the non-radical mechanism. Moreover, ZM2 exhibited good stability and reusability, suggesting its potential application in wastewater treatment.
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