Hydroxyl Radical Generation by Recyclable Photocatalytic Fe3O4/ZnO Nanoparticles for Water Disinfection

IF 3.5 Q2 ENVIRONMENTAL SCIENCES

Air Soil and Water Research Pub Date : 2020-11-01 DOI:10.1177/1178622120970954

Oscar D. Máynez-Navarro, M. Méndez-Rojas, D. X. Flores-Cervantes, J. Sánchez-Salas

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引用次数: 6

Abstract

Advanced oxidation processes based on photocatalytic generation of •OH radicals have emerged as promising technologies for the removal of recalcitrant pollutants in water. However, their poor recyclability has reduced their potential large-scale application. Herein, a Fe3O4-embedded ZnO system has been prepared and its photocatalytic •OH radicals activity was evaluated by monitoring the photo-assisted bleaching of p-nitrosodimethylaniline (pNDA). Water disinfection performance was determined by measuring Escherichia coli inactivation under different conditions. Bleaching of nearly 80% of the initial pNDA concentration after just 120 minutes under UV365nm irradiation was determined. Bacterial inactivation at different concentrations (0.1, 1.0, and 5.0 mg mL−1) of the Fe3O4/ZnO nanocomposite was determined, finding that the best performance was obtained at 0.1 mg mL−1 (90%) just after the first 30 minutes under UV irradiation. The materials are easily magnetically recovered and their performance evaluated after 3 consecutive cycles of reuse. These magnetic and photoactive nanocomposites showed improved performance and could be used for wastewater treatment or disinfection processes of water.

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可回收光催化Fe3O4/ZnO纳米颗粒生成羟基自由基用于水消毒

基于光催化生成•OH自由基的高级氧化工艺已成为去除水中顽固污染物的有前途的技术。然而，它们较差的可回收性降低了它们大规模应用的潜力。本文制备了fe3o4包埋ZnO体系，并通过监测对亚硝基二甲苯胺(pNDA)的光辅助漂白，评价了其光催化•OH自由基活性。通过测定不同条件下大肠杆菌的灭活情况，确定水的消毒性能。在UV365nm照射下，仅120分钟后，pNDA的漂白率接近初始浓度的80%。研究了Fe3O4/ZnO纳米复合材料在不同浓度(0.1、1.0和5.0 mg mL−1)下的灭活效果，发现在0.1 mg mL−1下的灭活效果最好，在紫外线照射30分钟后达到90%。这些材料很容易被磁性回收，并且在连续重复使用3个周期后，它们的性能得到了评估。这些具有磁性和光活性的纳米复合材料表现出更好的性能，可用于废水处理或水的消毒过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Air Soil and Water Research ENVIRONMENTAL SCIENCES-

CiteScore

7.80

自引率

5.30%

发文量

审稿时长

8 weeks

期刊介绍： Air, Soil & Water Research is an open access, peer reviewed international journal covering all areas of research into soil, air and water. The journal looks at each aspect individually, as well as how they interact, with each other and different components of the environment. This includes properties (including physical, chemical, biochemical and biological), analysis, microbiology, chemicals and pollution, consequences for plants and crops, soil hydrology, changes and consequences of change, social issues, and more. The journal welcomes readerships from all fields, but hopes to be particularly profitable to analytical and water chemists and geologists as well as chemical, environmental, petrochemical, water treatment, geophysics and geological engineers. The journal has a multi-disciplinary approach and includes research, results, theory, models, analysis, applications and reviews. Work in lab or field is applicable. Of particular interest are manuscripts relating to environmental concerns. Other possible topics include, but are not limited to: Properties and analysis covering all areas of research into soil, air and water individually as well as how they interact with each other and different components of the environment Soil hydrology and microbiology Changes and consequences of environmental change, chemicals and pollution.