Regulating the reaction pathway of nZVI to improve the decontamination performance through magnetic spatial confinement effect

作者：Chi, Hai -Yuan; Zhou, Xiao-Xia^*; Wu, Min-Rong; Shan, Wan-yu; Liu, Jing-fu; Wan, Jin-quan; Yan, Bing; Liu, Rui^*

来源：Journal of Hazardous Materials, 2023, 447: 130799.

DOI：10.1016/j.jhazmat.2023.130799

• Nanoscale zero-valent iron
• Wastewater treatment
• Magnetic spatial confinement effect
• Reaction pathway
• Halogenated contaminants

Nanoscale zero-valent iron (nZVI) shows high effectiveness in the catalyzed removal of contaminants in wastewater treatment. However, the uncontrolled interfacial electron transfer behavior and formation of surface iron oxide (FeOx) layer led to severe electron wasting and occasionally form highly toxic intermediates. Here, we constructed magnetic mesoporous SiO2 shell on surface of nZVI to stimulate a magnetic spatial confinement effect and regulate the electron transfer pattern. Therein, Fe atom facilely spread out from the nZVI core, orderly release electron to surface adsorbed H2O molecule, which is efficiently transformed into active hydrogen (H*). Meanwhile, in-situ Raman revealed that Fe atoms were involved in the formation of penetrable gamma-FeOOH rather than FeOx layer, enabling the continuous inward diffusion of H2O and outward diffusion of H* . Employing the

• 单位
  中国科学院; 广州大学