Preparation and Characterization of Magnetite Talc (Fe3O4@Talc) Nanocomposite as an Effective Adsorbent for Cr(VI) and Alizarin Red S Dye

Abstract

In this work, the adsorption of Cr(VI) ions and the organic dye Alizarin Red S (ARS) was investigated using magnetite talc (Fe3O4@Talc) nanocomposite. Different characterization techniques such as scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray Diffraction (XRD), and thermogravimetric analysis (TGA) were used to demonstrate the physical and chemical properties of the fabricated Fe3O4@Talc nanocomposite. In addition, the adsorption isothermic, kinetic, and thermodynamic properties were illustrated. The results demonstrate that the investigated adsorption processes obeyed the Langmuir isotherm model for Cr(VI) and the Freundlich isotherm model for ARS dye, with a maximum adsorption capacity of 13.5 and 11.76 mg·g−1, respectively, controlled by pseudo second-order kinetics. Regeneration and reusability studies demonstrated that the prepared Fe3O4@Talc nanocomposite is a promising and stable adsorbent with considerable reusability potential.

Heat Treatment of Calcite to Enhance Its Removal of Color Dye Alizarin Red S

“…Higher pH values promoted the solubility of alizarin (AZ) in aqueous solution, as such, higher pH values negatively influenced AZ sorption on halloysite from 9.8 mg/g at pH 9 to 4.8 mg/g at pH 13 [39]. Similarly, ARS sorption on magnetite-talc composite materials decreased from 75% at pH 2 to 15% at pH 10 [23].…”

“…For inorganic materials, calcium hydroxide was tested for the removal of ARS under different physical and chemical conditions, but no ARS sorption capacity was provided [22]. Additionally, talc was coated with magnetite nanoparticles to enhance ARS removal with a capacity of 12 mg/g [23]. ARS removal from aqueous solution was also evaluated under different physical and chemical conditions using alumina, but the removal capacity was not mentioned [20].…”

Removal of Methylene Blue from Aqueous Solutions by Surface Modified Talc

“…Furthermore, the absorption peaks of impurities dolomite The FTIR spectra of raw and modified talc are recorded in Figure 3. The FTIR spectra show the characteristic absorption peaks in raw talc: Mg-OH stretching vibration (3677 cm −1 ), O-H stretching vibration of crystal water (3432 cm −1 ), O-H bending vibration (671 cm −1 ), Si-O stretching and bending vibration (1018 cm −1 and 446 cm −1 ) [40,41]. Compared to Talc, M-Talc showed new absorption peaks at 2920 cm −1 and 2850 cm −1 , which were stretching vibrations of -CH 3 and -CH 2 in CTAB, indicating successful loading of CTAB on the talc surface.…”