Magnetic Co-doped 1D/2D structured γ-Fe2O3/MoS2 effectively activated peroxymonosulfate for efficient abatement of bisphenol A via both radical and non-radical pathways

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Junge Xu, Dong Wang, Die Hu, Ziwei Zhang, Junhong Chen, Yingmu Wang, Yifeng Zhang
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Abstract

Iron-based catalysts have been widely used to treat refractory organic pollutants in wastewater. In this paper, magnetic Co-γ-Fe2O3 was synthesized by a facile tartaric acid-assisted hydrothermal method, and Co-γ-Fe2O3/MoS2 nanocomposite catalyst was obtained via in situ growth of MoS2 nanosheets on Co-γ-Fe2O3 nanoparticles. The nanocomposite catalysts were used to decompose bisphenol A (BPA) by activating peroxymonosulfate (PMS). It was shown that only 0.15 g/L catalyst and 0.5 mmol/L PMS degraded 10 mg/L of BPA (99.3% within 10 min) in the pH range of 3–9. PMS was activated due to redox cycling among the pairs Co(III)/Co(II), Fe(III)/Fe(II), and Mo(VI)/Mo(IV). Quenching experiments and electron paramagnetic resonance spectroscopy demonstrated that both radical and non-radical pathways were involved in BPA degradation, in which active radical sulfate radical and non-radical singlet oxygen were the main reactive oxygen species. Ten intermediates were identified by liquid chromatography-coupled mass spectrometry, and three possible BPA degradation pathways were proposed. The toxicity of several degradation intermediates was lower, and Co-γ-Fe2O3/MoS2 exhibited excellent reusability and could be magnetically recovered.

Abstract Image

磁性掺杂 1D/2D 结构的 γ-Fe2O3/MoS2 可有效激活过一硫酸盐,通过自由基和非自由基途径高效消减双酚 A
铁基催化剂已被广泛用于处理废水中的难降解有机污染物。本文采用酒石酸辅助水热法合成了磁性 Co-γ-Fe2O3,并通过 MoS2 纳米片在 Co-γ-Fe2O3 纳米颗粒上的原位生长获得了 Co-γ-Fe2O3/MoS2 纳米复合催化剂。该纳米复合催化剂通过活化过一硫酸盐(PMS)来分解双酚 A(BPA)。结果表明,在 pH 值为 3-9 的范围内,仅 0.15 g/L 催化剂和 0.5 mmol/L PMS 就能降解 10 mg/L 的双酚 A(10 分钟内降解 99.3%)。由于 Co(III)/Co(II)、Fe(III)/Fe(II)和 Mo(VI)/Mo(IV)之间的氧化还原循环,PMS 被激活。淬灭实验和电子顺磁共振光谱表明,自由基和非自由基途径都参与了双酚 A 的降解,其中活性自由基硫酸根自由基和非自由基单线态氧是主要的活性氧物种。液相色谱-耦合质谱法鉴定了十种中间产物,并提出了三种可能的双酚 A 降解途径。几种降解中间产物的毒性较低,Co-γ-Fe2O3/MoS2 具有良好的重复利用性,可进行磁性回收。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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