Abstract

GARZON-CUCAITA, Valentina  and  CARRIAZO, José G.. Iron Oxides as Catalysts of Fenton-Type Processes with Potential Application in Pollutant Removal Technologies. TecnoL. [online]. 2022, vol.25, n.55, e300.  Epub Feb 06, 2023. ISSN 0123-7799.  https://doi.org/10.22430/22565337.2393.

The designing of new technologies for wastewater treatment is needed. These procedures should have greater efficiency and broad engineering application scope. Among these technologies, the advanced oxidation processes (AOP) have shown high efficiency and potential application in the degradation of hazardous pollutants. Fenton and Fenton-type reactions constitute the most widely used group of AOPs, due to their great oxidizing power and feasibility of application. The iron oxides are stable, non-toxic, and abundant; they have been extensively studied as catalysts for Fenton-type systems. The aim of this work is to show the state of the art on the application of iron oxides as catalysts in these systems. Methodologically, a systematic bibliographic review was carried out on the iron oxides used in Fenton-type processes, using the Scopus database with a search formula that included the appropriate descriptors and boolean operators. As a result, a wide variety of structures with different characteristics and catalytic performance were identified, classified, and analyzed. As conclusion, the most studied species like heterogeneous Fenton catalysts have been magnetite (Fe3O4), hematite (α-Fe2O3), goethite (α-FeOOH) and ferrihydrite (FeOOH). They show different levels of degradation of organic contaminants, depending on the type of substrate, pH, temperature, and concentration of H2O2. In addition, some modifications focused on improving the catalytic efficiency were described: the use of UV-Vis radiation, incorporation of metallic Fe (Fe0) or transition metals (Co, Cu and Mn), catalytic supports, and the control of particle morphology.

Keywords : Heterogeneous catalyst; iron oxide; advanced oxidation process; Fenton reaction; pollutant removal technology.

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