Dehbi, A. and Dehmani, Y. and Omari, H. and Lammini, A. and Elazhari, K. and Abdallaoui, A. (2020) Hematite iron oxide nanoparticles (α-Fe2O3): Synthesis and modelling adsorption of malachite green. Journal of Environmental Chemical Engineering, 8 (1).

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Abstract

To study themalachite green(MG) removal from aqueous solution, iron oxide was prepared from iron(III) nitrate nonahydrate (Fe(NO3)3, 9H2O) and ammonium hydroxide (NH4OH). The Fe2O3characterizationwas examined by X-ray diffraction spectroscopy (XRD), Brunauer Emmett- Teller (BET) specific surface area measurements and Fourier transform infrared (FT-IR) spectroscopy. The data of malachite green Kinetics adsorptions, show that the adsorption followed pseudo-second order kinetics. For concentrations below 6.10-4 mol/l, MG solution was almost completely decolorized after 45 min. The elimination percentage reached 86.13 for the concentration 6.10-4 mol/l and 25 mg of the Hematite. The experimental isotherms were analyzed with Langmuir, Freundlich and Redlich-Peterson using non-linear regression. The results showed that the Freundlich isotherms best-fit the equilibrium data. The thermodynamic study has shown that MG adsorption on Hematite is endothermic (ΔH°>0); it increases with temperature. The negative ΔG° values showed that the MG adsorption process on the Hematite is spontaneous. However, the positive value of ΔS° indicates the increase in Hematite-solution interface disorder at the time of MG fixation. © 2019 Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Ammonium hydroxide; Carbonate minerals; Chemicals removal (water treatment); Dyes; Enzyme kinetics; Fourier transform infrared spectroscopy; Hematite; Isotherms; Kinetics; Synthesis (chemical), Brunauer emmett tellers; Fourier transform infra red (FTIR) spectroscopy; Iron oxide nanoparticle; Non-linear regression; Pseudo second order kinetics; Specific surface area measurement; Thermodynamic parameter; X-ray diffraction spectroscopy, Adsorption
Subjects: Chemical Engineering
Divisions: SCIENTIFIC PRODUCTION > Chemical Engineering
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:44
URI: http://eprints.umi.ac.ma/id/eprint/1690

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