MoO2 co-catalytic Fe3+/periodate for tetracycline degradation: Key role of Fe/Mo cycling and high-valent iron (Fe(IV)) generation

降级(电信) 催化作用 自行车 化学 高碘酸盐 四环素 无机化学 核化学 有机化学 生物化学 计算机科学 电信 历史 考古 抗生素
作者
Wenqin Li,Ding Zhou,Haiwei Jiang,Haoyun Chen,Jiayin Guo,Jinjuan Yang,Xinyu Wang,Hou Wang,Xingzhong Yuan,Longbo Jiang
出处
期刊:Separation and Purification Technology [Elsevier]
卷期号:346: 127509-127509 被引量:1
标识
DOI:10.1016/j.seppur.2024.127509
摘要

Homogeneous Fenton-like catalysts with a single redox site have a rate-limiting step in the oxidant activation process, limiting their application in wastewater treatment. In this study, the addition of MoO2 not only accelerated the cycling of Fe3+/Fe2+ in the Fe3+/periodate system, but also generated more active species to degrade tetracycline (TC). The MoO2/Fe3+/periodate system rapidly eliminated TC within 10 min, and its removal rate was 3.68 times higher than that of the Fe3+/periodate process. The degradation system was able to achieve high degradation efficiency despite the interference of pH (2.95–9.04), inorganic anions (Cl−, NO3−, SO42−) and humic acid (HA) in the aqueous environment. Non-radical including high-valent iron (Fe(IV)) and singlet oxygen (1O2) played a dominant role in the degradation of TC. Self-degradation of Fe(IV) and the subsequent Fenton-like processes indirectly trigger the production of •OH and O2•−. XPS analysis demonstrated that the conversion of Mo(IV) to Mo(V)/Mo(VI) facilitated the Fe3+/Fe2+ cycle. Subsequently, Mo(VI) could be reduced to realize the regeneration of Mo(IV) while completing the conversion of O2•− to 1O2. In addition, after five cycles of reaction, MoO2 showed superb stability and recyclability. This case expanded a new direction for the study of the production and transformation of active species in the inorganic co-catalyst-assisted Fe3+/periodate system.
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