Citation: Mingli Jiang, Weihua Xu, Xin Li, Xiaofei Tan, Wei Zhang. Fe-bearing clay minerals as catalysts for oxidant activation in organic pollutant degradation: ROS generation driven by Fe(Ⅱ)/Fe(Ⅲ) redox cycling[J]. Chinese Chemical Letters, ;2026, 37(7): 112274. doi: 10.1016/j.cclet.2025.112274 shu

Fe-bearing clay minerals as catalysts for oxidant activation in organic pollutant degradation: ROS generation driven by Fe(Ⅱ)/Fe(Ⅲ) redox cycling

Mingli Jiang ^{a, b} ,
Weihua Xu ^{a, b, *,} ,
Xin Li ^{a, b} ,
Xiaofei Tan ^{a, b} ,
Wei Zhang ^{a, b}

a.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
b.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China

whxu@hnu.edu.cn

Received Date: 8 June 2025
Revised Date: 1 December 2025
Accepted Date: 11 December 2025
Available Online: 13 December 2025

Figures(4)

Fe-bearing clay minerals have garnered significant attention in environmental catalysis due to their unique Fe(Ⅱ)/Fe(Ⅲ) redox cycling and high surface area, which enable the effective activation of oxidants such as molecular oxygen (O₂), peroxymonosulfate, and other species, and the subsequent generation of reactive oxygen species (ROS). This review offers a comprehensive overview of the structural characteristics and iron coordination environments within these minerals that govern electron transfer processes from Fe(Ⅱ) to oxidant species. It further explores the mechanistic pathways that lead to the formation of superoxide, hydroxyl radicals (^•OH), and singlet oxygen, detailing the chemical reactions involved. Additionally, the influence of various co-substrates and chelating agents, such as humic acids and ethylenediaminetetraacetic acid (EDTA), on the enhancement of redox processes and ROS generation is discussed, focusing on their roles in modulating reaction kinetics and improving catalytic efficiency. Furthermore, the review highlights the recent advancements in applying Fe-bearing clay minerals for the degradation of persistent organic pollutants, including dyes, pharmaceuticals, and pesticides, in both aqueous and soil environments. The potential for optimizing these mineral-based catalytic systems by tailoring their composition or creating hybrid materials is also explored to develop more efficient and scalable solutions for environmental remediation. This review outlines future research directions, emphasizing the integration of fundamental mechanistic insights with practical applications for pollutant degradation.
- Fe-bearing clay minerals,
- Fe(Ⅱ)/Fe(Ⅲ) redox cycle,
- Synergistic additives,
- Molecular oxygen activation,
- Persistent organic pollutants
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沈阳化工大学材料科学与工程学院沈阳 110142