Experimental analysis demonstrates tunable dye adsorption using manganese ferrite-polyaniline nanocomposites, highlighting their potential for wastewater treatment.
The uniqueness of this work is the comparison of manganese ferrites/polyaniline (MnxFe3 − xO4/PANI) produced using K2S2O8 as an oxidant for aniline with the efficacy of spinel manganese ferrite with various Mn2+ ratios for the polymerization of aniline. The structural and morphological properties of the nanocomposites were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT‐IR), X‐ray powder diffraction (XRD), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDX), transmission electron microscopy (TEM), and Brunauer‐Emmett‐Teller (BET) techniques. XRD results confirmed the formation of a single‐phase cubic spinel structure with a lattice constant of approximately 8.3 Å. The surface enriched by Mn2+ exhibited an enhanced valence of +3 and +4, increased lattice oxygen content, facilitated ferrite reduction, and improved the oxidative performance of Fe3+. The saturation magnetization decreased with an increase in Mn+2 ratios and PANI contents. The nanocomposites exhibited excellent adsorption of Lanaset Brown B dye, which was investigated as a model textile dye. Various adsorption capacities (qmax) for the nanocomposites were calculated in a range of 122.39–215 mg/g, depending on the synthesis conditions. Optimization parameters, such as pH, adsorbent dose, and initial concentration, as well as reusability, were described. The Langmuir isotherm is a better model for describing the adsorption process of the nanocomposites. An evaluation of thermodynamic parameters suggests the sorption process is feasible, spontaneous, and endothermic.
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Gemeay et al. (2022) studied this question.
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