内部电场触发CuO/Fe2O3复合材料中的电荷重分布,调控过氧单硫酸盐活化,增强对有机污染物的降解

IF 7.3 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Dongchen Lv , Jiayi Gao , Yifan Shao , Yudi Wang , Jiahong Pan , Yanqing Cong , Shi-Wen Lv
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引用次数: 0

摘要

本文采用一种可行的方法合成了具有异质结构的CuO/Fe2O3复合材料。由于功函数的显著差异,CuO与Fe2O3结合后在异质结界面处形成内部电场,降低界面电阻,加速电荷转移。有趣的是,在内部电场提供的静电相互作用的感应下,CuO/Fe2O3复合材料会形成富电子和缺电子的活性区。更重要的是,过氧单硫酸盐(PMS)可以被具有缺电子活性区的CuO氧化生成SO5•-,然后转化为1O2。同时,具有富电子活性区的Fe2O3组分可以为PMS提供电子,实现Fe-O-O的杂解,从而生成高价金属配合物(即≡Fe5+=O)。因此,CuO/ fe2o3 -2介导的PMS系统具有良好的抗干扰能力,在废水处理中表现出优异的性能。得益于1O2和≡Fe5+=O的亲电反应,各种典型的有机污染物可以通过CuO/ fe2o3 -2介导的PMS体系最终矿化成CO2、H2O等无毒副产物。总之,本工作对内电场对PMS激活的影响有一些新颖的认识,可以为今后的研究提供有价值的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Internal electric field triggered charge redistribution in CuO/Fe2O3 composite to regulate the peroxymonosulfate activation for enhancing the degradation of organic pollutants

Internal electric field triggered charge redistribution in CuO/Fe2O3 composite to regulate the peroxymonosulfate activation for enhancing the degradation of organic pollutants

Internal electric field triggered charge redistribution in CuO/Fe2O3 composite to regulate the peroxymonosulfate activation for enhancing the degradation of organic pollutants
Herein, we adopt a feasible method to synthesize the CuO/Fe2O3 composite with heterostructure. Owing to the significant differences in work functions, an internal electric field is built at the interface of heterojunction after the combination of CuO with Fe2O3, which can reduce interface resistance and accelerate charge transfer. Interestingly, under the induction of electrostatic interaction provided by internal electric field, the CuO/Fe2O3 composite will form electron-rich and electron-deficient active zones. More importantly, the peroxymonosulfate (PMS) can be oxidized by the CuO with electron-deficient active zone to generate SO5•‒, subsequently converting into 1O2. Meanwhile, the Fe2O3 component with electron-rich active zone can provide electrons for PMS to achieve the heterolysis of Fe-O-O, thereby producing the high-valent metal complex (namely ≡ Fe5+=O). Consequently, the CuO/Fe2O3-2-mediated PMS system with good anti-interference ability displays excellent performance in wastewater treatment. Benefiting from the electrophilic reaction of 1O2 and ≡ Fe5+=O, various typical organic pollutants can be ultimately mineralized into CO2, H2O and other nontoxic by-products by the CuO/Fe2O3-2-mediated PMS system. In short, current work shares some novel insights into the effect of internal electric field on PMS activation, which can provide valuable references for future research.
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来源期刊
Environmental Pollution
Environmental Pollution 环境科学-环境科学
CiteScore
16.00
自引率
6.70%
发文量
2082
审稿时长
2.9 months
期刊介绍: Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.
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