What question did this study set out to answer?

The aim is to prepare iron oxide-impregnated activated carbon composites for efficient dye removal.

February 26, 2026International Journal of Environment and Waste Management0 citations

Preparation and characterisation of activated carbon impregnated with goethite and magnetite for dye removal by the combined action of adsorption and oxidation

MBMaria Eduarda Bragi�ã NONa Kyoung O GDGilberto Ascón D.

Key Points

The aim is to prepare iron oxide-impregnated activated carbon composites for efficient dye removal.
Precipitation of goethite and magnetite on activated carbon.
Characterization using SEM, EDS, FTIR, and XRD.
Adsorption and oxidation experiments conducted with Reactive Black 5 dye at pH levels 3.0 and 6.0.
Goethite and magnetite partially covered the activated carbon surface.
Composites showed decreased specific surface area and pore volume.
Effective dye removal was achieved with the composites in the presence of hydrogen peroxide.

Abstract

In this work, methodologies for the precipitation of goethite (G) and magnetite (M) iron oxides on activated carbon (AC0) were applied to prepare two composites (G/AC and M/AC) to remove the Reactive Black 5 (RB5) dye by adsorption/oxidation processes. SEM and EDS showed that the iron oxides partially covered the surface of the AC0, giving a small decrease in the specific surface areas and total pore volume of composites. The FTIR and XRD results showed the presence of goethite on the surface of the G/AC composite (4.23 mgFeg-1), and a mixture of goethite and magnetite oxides in M/AC (30.77 mgFeg-1). The RB5 dye adsorption and oxidation experiments were carried out in initial pH of 3.0 and 6.0. The composites were effective in removing the RB5 dye in the presence of H2O2, since they were able to combine the adsorptive characteristics of AC with the oxidative capacity of iron oxides.

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