Understanding the pivotal role of ubiquitous Yellow River suspend sediment in efficiently degrading metronidazole pollutants in water environments

污染物 沉积物 环境科学 甲硝唑 环境化学 生态学 地质学 化学 生物 微生物学 地貌学 抗生素
作者
Quantao Cui,Yuyin Dong,Weiwei Zou,Z.Y. Song,Wei Zhang,Qiting Zuo,Xiaoli Zhao,Fengchang Wu
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:929: 172522-172522 被引量:1
标识
DOI:10.1016/j.scitotenv.2024.172522
摘要

Sulfite-based advanced oxidation technology has received considerable attention for its application in organic pollutants elimination. However, the potential of natural sediments as effective catalysts for sulfite activation has been overlooked. This study investigates a novel process utilizing suspended sediment/sulfite (SS/S(IV)) for degradation of metronidazole (MNZ). Our results demonstrate that MNZ degradation efficiency can reach to 93.1 % within 90 min with 12.0 g SS and 2.0 mM sulfite. The influencing environmental factors, including initial pH, SS dosage, S(IV) concentration, temperature, and co-existing substances were systematically investigated. Quenching experiments and electron paramagnetic resonance analyses results indicate that SO3•− is the primary active substance responsible for MNZ degradation, with involvement of SO4•−, SO5•−, and •OH. X-ray photoelectron spectroscopy and Mössbauer spectra reveal that Fe (III)-silicates play a crucial role in activating S(IV). Furthermore, analysis of degradation intermediates and pathways of MNZ is conducted using liquid chromatography with mass spectrometry (LC -MS). The toxicity of MNZ and its intermediates were also systematically evaluated by the T.E.ST. program and wheat seeds germination test. This study offers valuable insight into the activation of sulfite by natural sediments and could contribute to the development of SS-based advanced oxidation processes (AOPs) for the in-situ remediation of antibiotics-contaminated water environments.
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