Employment of magnetized bentonite by Fe3O4 nanoparticles synthesized from mining waste to remove metals from water
Magnetite nanoparticles were synthesized from mining sludge (Mag-NPR) by co-precipitation with ammonium hydroxide. Mag-NPR was used in bentonite coating (B-Mag) for removing iron (Fe) and manganese (Mn) ions from water. Mag-NPR and B-Mag were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), nitrogen physisorption, and scanning electron microscopy, and structural similarity with conventional magnetite patterns were observed. The maximum sorption capacity in B-Mag was 1.43x (Fe) and 3.30x (Mn) higher when compared to bentonite, indicating that the synthesized material is effective in removing Fe(II) and Mn(II). The mobilization factors for Fe and Mn were 96.6% and 24.3% for B-Mag and 36.2% and 26.9% for bentonite. The new magnetic properties make the B-Mag reusable and easily separated from the aqueous solution, removing color, smell, and turbidity beyond Fe(II) and Mn(II) with great technological potential. The MatLab algorithms describe metal ion sorption and desorption capacity of the new material B-Mag, as well as pH variation in the processes.