Enhancement of Electron Transfer Between Fe/Mn Promotes Efficient Activation of Peroxomonosulfate by FeMn-NBC

IF 1.4 4区环境科学与生态学 Q4 WATER RESOURCES

Water SA Pub Date : 2025-06-04 DOI:10.3390/w17111700

Xiaoji Lin, Qiang Ge, Xianbo Zhou, Yan Wang, Congyun Zhu, Kun Liu, Jinquan Wan

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引用次数: 5

Abstract

Bimetallic catalysts can effectively enhance the catalytic degradation efficiency of peroxymonosulfate (PMS), which is usually attributed to the enhancement of electron transfer, but currently, there is no clear explanation of the mechanism of how the electron transfer is enhanced. A nitrogen-doped Fe/Mn composite biochar (FeMn-NBC) was co-constructed by hydrothermal synthesis and high-temperature calcination. The FeMn-NBC activated PMS more efficiently than the monometallic one due to the enhanced electron transfer between Fe and Mn. The FeMn-NBC/PMS system activated PMS with Mn as the active center, and the high oxidation state of Mn4+ promoted the acceleration of the PMS adsorption of the generation of Mn2+/Mn3+. This gaining effect accelerated the electron cycling between Fe2+/Fe3+ and Mn2+/Mn3+/Mn4+, which enhanced the PMS catalysis to generate free radicals (•OH, SO4•− and •O2−) and non-radicals (1O2) for the efficient degradation of diisobutyl phthalate (DIBP). Benefiting from this gaining effect, the degradation rate of DIBP by the FeMn-NBC/PMS system was increased by 2.43 and 3.38 times compared to Fe-NBC and Mn-NBC. The bimetallic-enhanced electron transfer mechanism proposed in this study facilitated the development of efficient catalysts for more efficient and selective removal of organic pollutants.

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Fe/Mn间电子转移的增强促进了FeMn-NBC对过氧一硫酸盐的高效活化

双金属催化剂能有效地提高过氧单硫酸盐（PMS）的催化降解效率，通常将其归因于电子转移的增强，但目前对电子转移如何增强的机制还没有明确的解释。采用水热合成和高温煅烧法制备了氮掺杂Fe/Mn复合生物炭（FeMn-NBC）。由于Fe和Mn之间的电子转移增强，FeMn-NBC比单金属的PMS更有效地激活了PMS。FeMn-NBC/PMS体系以Mn为活性中心对PMS进行活化，Mn4+的高氧化态促进了PMS对Mn2+/Mn3+生成的加速吸附。这种增益效应加速了Fe2+/Fe3+和Mn2+/Mn3+/Mn4+之间的电子循环，增强了PMS催化生成自由基（•OH、SO4•−和•O2−）和非自由基（1O2）的能力，从而有效降解邻苯二甲酸二异丁酯（DIBP）。利用这种增益效应，FeMn-NBC/PMS体系对DIBP的降解率比Fe-NBC和Mn-NBC分别提高了2.43倍和3.38倍。本研究提出的双金属增强电子转移机制促进了高效催化剂的开发，以更有效和选择性地去除有机污染物。

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

Water SA 环境科学-水资源

CiteScore

2.80

自引率

6.70%

发文量

审稿时长

18-36 weeks

期刊介绍： WaterSA publishes refereed, original work in all branches of water science, technology and engineering. This includes water resources development; the hydrological cycle; surface hydrology; geohydrology and hydrometeorology; limnology; salinisation; treatment and management of municipal and industrial water and wastewater; treatment and disposal of sewage sludge; environmental pollution control; water quality and treatment; aquaculture in terms of its impact on the water resource; agricultural water science; etc. Water SA is the WRC’s accredited scientific journal which contains original research articles and review articles on all aspects of water science, technology, engineering and policy. Water SA has been in publication since 1975 and includes articles from both local and international authors. The journal is issued quarterly (4 editions per year).