CIESC Journal ›› 2025, Vol. 76 ›› Issue (1): 385-393.DOI: 10.11949/0438-1157.20240812

• Energy and environmental engineering • Previous Articles     Next Articles

Reaction mechanism for the enhanced removal of selenite in water by ball-milling of zero-valent iron with Fe3O4

Junyao QIAN(), Chengze WANG, Jinhua ZHANG, Hua LIU, Zhaorui LIU, Jinxiang LI()   

  1. School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
  • Received:2024-07-17 Revised:2024-09-11 Online:2025-02-08 Published:2025-01-25
  • Contact: Jinxiang LI

磁铁矿球磨零价铁增效去除水中亚硒酸盐的反应机制

钱珺瑶(), 王承泽, 张晋华, 刘华, 刘昭睿, 李锦祥()   

  1. 南京理工大学环境与生物工程学院,江苏 南京 210094
  • 通讯作者: 李锦祥
  • 作者简介:钱珺瑶(2001—),女,硕士研究生,965765935@qq.com
  • 基金资助:
    国家重点研发计划项目(2021YFA1201701)

Abstract:

In order to enhance the performance of zero-valent iron (ZVI) in removing selenite [Se(Ⅳ)] from water, a modification method of magnetite (Fe3O4) ball-milled doped ZVI (BF-ZVI) was proposed. The results showed that the reaction rate of Se(Ⅳ) removal by BF-ZVI was 1.3—3.1 times that of the ball-milled ZVI without Fe3O4 (B-ZVI) in the range of initial pH 4.0—8.0. The key roles of free ferrous iron, structural ferrous iron and trivalent iron in the process of Se(Ⅳ) removal by BF-ZVI were clarified by the establishment of the correlation analysis between the iron reactive species in the BF-ZVI system and its Se(Ⅳ) removal. Based on the results of XPS and electrochemical impedance characterization, it was further illustrated that ball-milling synergistically with Fe3O4 can mediate the electron transfer of inner-core iron, thus enhancing the reduction and decontamination of Se(Ⅳ) by ZVI.

Key words: zero-valent iron, magnetite, iron reactive species, electron transfer, correlation analysis

摘要:

为增强零价铁(ZVI)去除水中亚硒酸盐[Se(Ⅳ)]的性能,提出了磁铁矿(Fe3O4)球磨掺杂ZVI(BF-ZVI)的改性方法。研究结果表明,溶液初始pH为4.0~8.0,BF-ZVI去除Se(Ⅳ)的反应速率是球磨ZVI(B-ZVI)的1.3~3.1倍;通过建立BF-ZVI体系中铁活性物种与其除Se(Ⅳ)间的相关性分析,明晰了游离态亚铁、结构态亚铁及三价铁在BF-ZVI除 Se(Ⅳ)过程中的关键作用;基于XPS和电化学阻抗表征结果,进一步阐明了球磨作用协同Fe3O4能够介导内核铁电子转移,进而实现ZVI对Se(Ⅳ)的增效还原除污。

关键词: 零价铁, 磁铁矿, 铁活性物种, 电子转移, 相关性分析

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