Journal
ENVIRONMENTAL POLLUTION
Volume 300, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2022.118939
Keywords
Modified biochar; Active manganese species; Periodate; Advanced oxidation processes (AOPs); OTC degradation
Categories
Funding
- Program for the National Natural Science Foundation of China [52170162, 51809090]
- Hunan Youth Talents Support Program [2021RC3049]
- Natural Science Foundation of Hunan Province, China [2019JJ50077]
- Fundamental Research Funds for the Central Universities [531118010114]
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In this study, the degradation of oxytetracycline (OTC) using periodate (PI) activated by manganese oxide/biochar composites (MnxOy@BC) was investigated. The experimental results showed high degradation rate and removal efficiency, and various reactive species were observed. Three degradation pathways were proposed based on the experimental findings.
Developing efficient catalysts for oxytetracycline (OTC) degradation is an ideal strategy to tackle environmental pollution, and advanced oxidation processes (AOPs) have been widely used for its degradation. However, the studies on the activation of periodate (PI) by biochar and its composites in recent years have been scarcely reported. In this study, we focused on the degradation of OTC by PI activation with manganese oxide/biochar composites (MnxOy@BC). Experimental results showed that the OTC degradation rate of MnxOy@BC/PI system reached almost 98%, and the TOC removal efficiency reached 75%. Various characteristic analysis proved that PI could be activated efficiently by surface functional groups and manganese-active species (Mn(II), Mn(III), and Mn(IV)) on biochar, and various reactive species such as singlet oxygen (O-1(2)), hydroxyl radical (center dot OH), and superoxide radical (O-2(center dot-)) can be observed via radical quenching experiments. Based on this, three degradation pathways were proposed. Furthermore, MnxOy@BC and PI were combined to degrade environmental pollutants, which achieved excellent practical benefits and had great practical application potential. We hope that it can provide new ideas for advanced oxidation processes (AOPs) applying for wastewater treatment in the future.
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