Fe(IV)/Fe(V)-mediated polyferric sulfate/periodate system: A novel coagulant/oxidant strategy in promoting micropollutant abatement

IF 11.3 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Hazardous Materials Pub Date : 2024-01-26 DOI:10.1016/j.jhazmat.2024.133614

Kaiting Zhang, Yuwei Xie, Lijun Niu, Xiangbin Huang, Xin Yu, Mingbao Feng

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Abstract

Strategic modulation of the advanced oxidation processes for the selective oxidation of micropollutants has attracted accumulating attention in water decontamination. This study first reported the combination of the coagulant polyferric sulfate (PFS) and oxidant periodate (PI) to accomplish synergistic abatement of the antibiotic sulfamethoxazole (SMX). The oxidizing performance of SMX by this system was almost unaffected by coexisting water constituents, indicating the great promise of selective oxidation. Different from the current hydroxyl radicals (^•OH)-mediated coagulant/oxidant systems (e.g., PFS/H₂O₂ and PFS/ozone), the dominance of high-valent Fe(IV)/Fe(V) intermediates was unambiguously verified in the PFS/PI treatment. The PFS colloids before and after the oxidation were characterized and the iron speciation was analyzed. The transformation of monomeric iron configurations (Fe(a)) to oligomeric iron configurations (Fe(b)) could maintain the homeostasis of surface-bound Fe(III) and Fe(II). The interaction mechanisms included the production of reactive species and dynamic reaction equilibrium for micropollutant degradation. Finally, the transformation pathways of SMX and carbamazepine (CMZ) in the PFS/PI system were postulated. Overall, this study provided a novel coagulant/oxidant strategy to achieve selective and sustainable water purification.

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Fe(IV)/Fe(V)介导的聚硫酸铁/碘酸根系统：促进微污染物减排的新型混凝剂/氧化剂策略

战略性地调节高级氧化过程以选择性地氧化微污染物已在水污染领域引起越来越多的关注。本研究首次报道了将混凝剂聚铁硫酸盐（PFS）和氧化剂高碘酸盐（PI）结合在一起，以实现对抗生素磺胺甲噁唑（SMX）的协同消减。该系统对 SMX 的氧化性能几乎不受共存水成分的影响，这表明了选择性氧化的巨大前景。与目前由羟基自由基（-OH）介导的混凝剂/氧化剂体系（如 PFS/H2O2 和 PFS/臭氧）不同，高价铁（IV）/铁（V）中间体在 PFS/PI 处理中的主导地位得到了明确验证。对氧化前后的 PFS 胶体进行了表征，并分析了铁的种类。单质铁构型（Fe(a)）向低聚铁构型（Fe(b)）的转变可以维持表面结合的铁(III)和铁(II)的平衡。相互作用机制包括活性物种的产生和微污染物降解的动态反应平衡。最后，推测了 SMX 和卡马西平（CMZ）在 PFS/PI 系统中的转化途径。总之，这项研究为实现选择性和可持续水净化提供了一种新型混凝剂/氧化剂策略。

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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.