Application of iron-based materials in heterogeneous advanced oxidation processes for wastewater treatment: A review

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 407; p. 127191
• Main Authors: Luo, Hongwei, Zeng, Yifeng, He, Dongqin, Pan, Xiangliang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2021
• Subjects: Advanced oxidation processes; Free radicals; Iron-based materials; Organic pollutants; Reaction mechanisms; Advanced oxidation processes; BDD; GDE; RHA; RHSi; Organic pollutants; MFC; WC; EDDS; MNP; AOPs; CAs; CNTs; COD; DOC; rGO; GC; Reaction mechanisms; PDS; ACA; GF; AA; UV; BEF; AQS; CF; Free radicals; ACF; MOF; Iron-based materials; TOC; PPCPs; nZVI; BES; mZVI; MCFC; PMS; ROS; HA; PAHs; Fe-Mn-O NSs; MWCNTs; MHMCs
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.127191

[Display omitted] •Three kinds of AOP systems based on different oxidants are described in detail.•Activation and mechanism of iron-based materials in AOPs are discussed.•Three auxiliary methods for AOPs catalyzed by iron-based materials are summarized.•Knowledge gaps and research needs related to iron-based materials are proposed. Advanced oxidation processes (AOPs) can produce a large number of active and non-selective free inorganic radicals in the reaction, which makes them widely used in wastewater treatment, especially in the removal of refractory organic pollutants. In the presence of activator and depending on the type of oxidants (H2O2, persulfate, and percarbonate), AOPs often generate different radicals such as HO• and SO4•−, but the oxidation activity of inactivated oxidants is low. The applications of iron-based materials for activation of heterogeneous AOPs to effectively remove refractory organic pollutants have been extensively concerned due to their environmental friendliness and cost-effectiveness. In addition, the supplementary of light, electricity and reducing agents can greatly promote the redox cycle of iron in the reaction and generate in situ H2O2 (precursors for HO• radicals) to further improve the reactivity of iron-based materials in AOPs. In this review, the possible applications of different iron-based materials (e.g., zero-valent iron, iron (hydr)oxides, and iron composite materials) in AOPs and their activation and catalytic mechanisms are introduced. By providing an overview of the applications of iron-based materials in AOPs, this review helps researchers choose and develop more effective iron-based catalysts suitable for different AOP systems, and suggests that iron-based catalysts can play an excellent role in large-scale practical applications.