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Efficient activation of periodate using MnFe2O4/BC composite for removal of organic contaminants: Performance and mechanism

高碘酸盐 复合数 机制(生物学) 污染 化学 化学工程 环境化学 废物管理 材料科学 有机化学 复合材料 工程类 生物 生态学 认识论 哲学
作者
Jie Huang,Haihang Tong,Dezhi Shi,Shuo Xu,Xianyi Wen,Kun Fu,Hui Xie,Huayi Cai,Jiayu Liu,Shiyi Tang,Zhiwei Wang
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:345: 127404-127404 被引量:13
标识
DOI:10.1016/j.seppur.2024.127404
摘要

The periodate (PI)-based advanced oxidation process (AOP) is an economical and energy-saving method for remediating water by degrading pollutants. An efficient system for PI activation was developed by loading manganese ferrite spinel (MnFe2O4) on biochar (BC) through a facile method, affording a metal-oxide MnFe2O4/BC composite catalyst. The developed system demonstrated significant effectiveness in eliminating various organic pollutants, particularly achieving high removal (5.26 and 2.83 times that of biochar and MnFe2O4, respectively) and mineralization (49.7 %) of the model pollutant tetracycline hydrochloride (TC) within 30 min. The system exhibited outstanding catalytic performance under various environmental conditions (pH, inorganic salts, humic acid, and real water bodies), as evidenced by quenching experiments and electron paramagnetic resonance (EPR) studies, proving that superoxide radicals (O2•-) are the main reactive species for TC degradation in the reaction system, in addition to singlet oxygen (1O2), iodyl radicals (IO3•) and hydroxyl radicals (•OH). Potential pathways for TC degradation in this system were revealed based on density functional theory (DFT) and the ecological toxicity of the intermediates was analyzed through quantitative structure–activity relationship (QSAR) assessment. Analysis of the magnetic hysteresis and cycling stability demonstrated that the composites were stable and could be recycled by applying a magnetic field. This work opens a new pathway for designing efficient PI activators for the selective oxidation of organic pollutants and highlights the potential application of this system in practical wastewater treatment.
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