Simple One-POT Hydrothermal Synthesis of CTAB-Assisted Spinel Manganese Ferrite Nanoparticles for Dye Removal: Kinetic and Isotherm Studies

Cetyltrimethylammonium bromide (CTAB)-assisted spinel manganese ferrite (MnFe2O4) (CTAB/MnF) nanoparticles have been developed via a hydrothermal route and applied against the removal of cationic dye. CTAB/MnF was studied by several characterization tools like X-ray diffractometer (XRD), field emission-scanning electron microscopy (FESEM), Fourier transformed infrared spectroscopy (FTIR), and ultraviolet–visible (UV–Vis) spectroscopy. Morphology of CTAB/MnF was found to be spherical with 85 nm particle size as an average size. Cationic dye such as crystal violet (CV) and methylene blue (MB) was used for selective dye removal onto CTAB/MnF via adsorption technique. The adsorption capacity of CV was measured by UV–Vis spectroscopy. The influence of parameters like pH, dosage, primary dye concentration, and adsorption time was considered for the optimization of the adsorption capacity of CTAB/MnF. The maximum adsorption capacity for CV by CTAB/MnF was better suited for the Langmuir isotherm model. The value of maximum adsorption capacity (qmax) of CTAB/MnF against CV was found 238 mg g−1. The adsorption kinetic for CV dye was found well-tuned with the pseudo second order model. Thus, concludingly, modified MnFe2O4 nanoparticles (CTAB/MnF) have been proven an excellent material for the abatement of crystal violet.