巧妙构建磁性可回收光芬顿催化剂 ZnFe2O4@MIL-88A(Fe)及其对左氧氟沙星的吸附降解活性

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Xichen Mi , Tingwei Wang , Yitong Chen , Dan Cao , Na Ma , Wei Dai
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引用次数: 0

摘要

金属有机框架(MOFs)的单调孔径和颗粒不可分离性严重影响了其光吸收能力和电荷分离能力,限制了其在水中降解左氧氟沙星等抗生素方面的应用。本研究采用简单的两步水热技术合成了一种磁性可分离纳米光催化剂(ZnFe2O4@MIL-88A(Fe))。形貌和微观结构分析表明,n 型 ZnFe2O4 催化剂颗粒被有效地组装在 MIL-88A(Fe) 晶体表面。光催化活性研究表明,与纯 ZnFe2O4 和 MIL-88A(Fe)相比,ZnFe2O4@MIL-88A(Fe) 加 H2O2 在可见光照射下对 LEV 的光 Fenton 活性显著提高,60 分钟内降解效率分别达到近 82% 和 25%。这种优异的光催化性能归功于 ZnFe2O4 和 MIL-88A(Fe)异质结构的协同效应,即催化体系中电荷载体的高效分离与 Fe3+ 和 Fe2+ 的高效还原相互促进。同时,还通过自由基猝灭、电子顺磁共振和质谱分析等方法深入研究了光-芬顿反应过程中 LEV 的降解机理和中间产物。此外,ZnFe2O4@MIL-88A(Fe)复合催化剂显示出显著的稳定性和易分离性,表明其具有光氧化降解有机污染物的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ingenious construction of a magnetic-recyclable photo-Fenton catalyst ZnFe2O4@MIL-88A(Fe) and its adsorption-degradation activity toward levofloxacin

Monotonic pore size and particles inseparability of metal-organic frameworks (MOFs) caused serious effects on its light absorption ability and charge separation, restricting its application for antibiotic such as levofloxacin (LEV) degradation in water. In this study, a magnetically detachable nano-photocatalyst (ZnFe2O4@MIL-88A(Fe)) was synthesized using a simple two-step hydrothermal technique. The morphology and microstructure analyses showed that n-type ZnFe2O4 catalyst particles were efficiently assembled onto the surface of MIL-88A(Fe) crystal. Photocatalytic activity studies indicated that the ZnFe2O4@MIL-88A(Fe) plus H2O2 exhibiting a significantly boosted photo-Fenton activity toward LEV at visible light irradiation, compared to the pure ZnFe2O4 and MIL-88A(Fe), the degradation efficiency accordingly reached up to nearly 82% and 25% within 60 min. This excellent photocatalytic performance was ascribed to the synergistic effects of the heterogeneous structure of ZnFe2O4 and MIL-88A(Fe), whereby the efficient separation of charge carriers in the catalytic system is mutually reinforced with the efficient reduction of Fe3+ and Fe2+. Meanwhile, the degradation mechanism and intermediates of LEV during the photo-Fenton reaction process were also studied in depth through free radical burst, electron paramagnetic resonance, and mass spectrometry analyses, etc. Additionally, the ZnFe2O4@MIL-88A(Fe) composite catalyst displayed significant stability and ease of separation, indicating potential for the photo-oxidative degradation of organic pollutants.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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