磁铁矿球磨零价铁增效去除水中亚硒酸盐的反应机制  

Reaction mechanism for the enhanced removal of selenite in water by ball-milling of zero-valent iron with Fe_(3)O_(4)

作　　者：钱珺瑶 王承泽 张晋华[1] 刘华 刘昭睿 李锦祥 QIAN Junyao;WANG Chengze;ZHANG Jinhua;LIU Hua;LIU Zhaorui;LI Jinxiang(School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学环境与生物工程学院,江苏南京210094

出　　处：《化工学报》2025年第1期385-393,共9页CIESC Journal

基　　金：国家重点研发计划项目(2021YFA1201701)。

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(Fe_(3)O_(4))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Fe_(3)O_(4)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。In order to enhance the performance of zero-valent iron(ZVI)in removing selenite[Se(Ⅳ)]from water,a modification method of magnetite(Fe_(3)O_(4))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 Fe_(3)O_(4)(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 Fe_(3)O_(4)can mediate the electron transfer of inner-core iron,thus enhancing the reduction and decontamination of Se(Ⅳ)by ZVI.

关 键 词：零价铁 磁铁矿 铁活性物种 电子转移 相关性分析 

分 类 号：X703.5[环境科学与工程—环境工程]