Synthesis of Fe-Mn-Based Materials and Their Applications in Advanced Oxidation Processes for Wastewater Decontamination: A Review

With the development of industry and agriculture, theincreasinglyserious problems of environmental pollution and water quality deteriorationthat affect human health need to be solved. Materials containing bothFe and Mn, the two most abundant metal elements, have been widelyused for wastewater decontamination since they are nontoxic, low-cost,easy to prepare, and highly efficient. This review systematicallysummarizes the synthesis methods of Fe-Mn-based unloaded materials(such as spinel-type, perovskite-type, layered double hydroxides,metal-organic framework, and its derivatives) and loaded materials(carbon materials, oxides, and other loaded materials). Furthermore,the progress and problems of the application of Fe-Mn-basedmaterials in the fields of Fenton, photo-Fenton, electro-Fenton, persulfate,and sulfite catalysis processes are analyzed. Different activationmechanisms of Fe-Mn-based materials, such as radical pathwaysand nonradical pathways (like direct electron transfer pathways, singletoxygen, and high valence metals, etc.) are described. Finally, theapplication potential of Fe-Mn-based materials in environmentalremediation is clarified and the future research directions are pointedout. It is expected that this review can provide new inspiration forsubsequent research on the application of Fe-Mn based materialsfor wastewater treatment.