Research and application of active species based on high-valent iron for the degradation of pollutants: A critical review

Yang Liu; Yang Yuan; Yue Wang; Huu Hao Ngo; Jie Wang

doi:10.1016/j.scitotenv.2024.171430

Research and application of active species based on high-valent iron for the degradation of pollutants: A critical review

Sci Total Environ. 2024 May 10:924:171430. doi: 10.1016/j.scitotenv.2024.171430. Epub 2024 Mar 6.

Authors

Yang Liu¹, Yang Yuan¹, Yue Wang², Huu Hao Ngo³, Jie Wang⁴

Affiliations

¹ State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China; School of Material Science and Engineering, Tiangong University, Tianjin 300387, China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China.
² State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China.
³ Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, New South Wales 2007, Australia. Electronic address: HuuHao.Ngo@uts.edu.au.
⁴ State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China; School of Material Science and Engineering, Tiangong University, Tianjin 300387, China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China. Electronic address: wangjie@tiangong.edu.cn.

PMID: 38458457
DOI: 10.1016/j.scitotenv.2024.171430

Abstract

Fe(VI), as a new green treatment agent, has two indispensable processes in water treatment: coagulation and oxidation. Fe(VI) has a strong oxidation ability. The intermediate iron species (Fe(V) and Fe(IV)) and reactive radical species (H₂O₂, •OH, and O₂•-) produced by decomposition and reduction reaction have strong oxidation ability, in addition, the hydrolyzed product formed in situ with core (γ-Fe₂O₃)-shell (γ-FeOOH) structure also has good coagulation effect. Because Fe(VI) is easy to decompose and challenging to preserve, it limits the application and sometimes significantly reduces the subsequent processing effect. How to make Fe(VI) more efficient use is a hot spot in current research. This article summarizes the distribution of active substances during the hydrolysis of Fe(VI), distinguish the differences mechanisms in the similar regulation methods, reviews the current preparation methods of Fe(VI), and finally reviews the applications of Fe(VI) in the field of environmental remediation.

Keywords: Environmental remediation; Ferrate(VI); High-valent iron intermediates; Hydrolysis products.

Publication types

Review