硅包覆氧化铁纳米晶体通过类似芬顿反应途径实现微波强化催化降解有机化合物

IF 10.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Junseok Lee, Seunghyun Weon, Seung Soo Steve Lee, Eun-tae Yun, Myoung Won Chung, Changwoo Kim, Hailiang Wang, John D. Fortner
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引用次数: 0

摘要

微波(MW)增强催化氧化工艺是水和废水处理过程中有机化合物降解的新兴有效技术。在这项研究中,通过微波辐照,单分散的超顺磁性氧化铁纳米晶体(IONCs)具有薄的无定形二氧化硅涂层,可以通过热增强的Fenton -型过程快速催化水中有机化合物的降解。为此,我们精确地合成了无定形二氧化硅包覆的各种金属氧化物(单畴)纳米晶体,然后评价了甲基橙(MO)和苯甲酸(BA)作为模型有机分子的降解情况。我们检查(并优化)核心(纳米晶体)组成,尺寸和浓度,以及溶液pH和过氧化氢(H2O2)浓度的影响。此外,我们通过自由基清除剂控制和电子顺磁共振(EPR)分析描述了离子在毫瓦辐射下催化降解BA的过程,支持了所提出的反应机理。对于所评估的材料,非晶二氧化硅涂层不仅可以防止纳米晶体完整性的损失,还可以在纳米晶体和体溶液之间提供一个活性的、稳定的界面,在那里有机化合物可以发生降解。合成的离子具有很高的性能,可重复使用超过五个循环,而不会导致纳米晶芯的劣化或金属浸出。综上所述,本研究强调了适当涂覆(即设计)MW吸收剂(此处为超顺磁离子)用于高级水处理的增强MW增强氧化过程的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Microwave-enhanced catalytic degradation of organic compounds with silica-coated iron oxide nanocrystals via fenton-like reaction pathway

Microwave-enhanced catalytic degradation of organic compounds with silica-coated iron oxide nanocrystals via fenton-like reaction pathway

Microwave (MW)-enhanced catalytic oxidation processes are emerging and effective techniques for the degradation of organic compounds in water and wastewater treatment processes. In this study, through applied MW irradiation, monodisperse, superparamagnetic iron oxide nanocrystals (IONCs) with thin, amorphous silica coatings are demonstrated to rapidly catalyze the degradation of organic compounds in water through a thermally enhanced, Fenton−type process. For this, we precisely synthesize amorphous silica-coated various metal oxide (single domain) nanocrystals, and then evaluate the degradation of methyl orange (MO) and benzoic acid (BA), chosen as model organic molecules. We examine (and optimize) the effects of core (nanocrystal) composition, size, and concentration, along with solution pH and hydrogen peroxide (H2O2) concentration. Further, we describe the catalytic degradation of BA with IONCs under MW irradiation through radical scavenger controls and electron paramagnetic resonance (EPR) analysis, which support the proposed reaction mechanism. For materials evaluated, the amorphous silica coating not only prevents the loss of nanocrystal integrity but also provides a reactive, yet stable, interface between nanocrystals and bulk solutions, where the degradation of organic compounds can occur. Synthesized IONCs show high performance, which is repeatable for over five cycles without any deterioration of the nanocrystals core or metal leaching. Taken together, this research highlights the potential of enhanced MW-enhanced oxidation processes appropriately coated (i.e., designed) MW absorbers (here as superparamagnetic IONCs) for advanced water treatment.

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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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