Kinetic and thermodynamic study of the adsorption of As(III) from aqueous solutions by naturally occurring and modified montmorillonites

[EN] Adsorption of As(III) from aqueous solutions using naturally occurring and modified Algerian montmorillonites was investigated as a function of contact time, pH and temperature. Kinetic studies reveal that uptake of As(III) ions is rapid within the first 3 hours and it slows down thereafter. Equilibrium studies show that As(III) shows the highest affinity towards Acidic-montmorillonite even at very low concentration of arsenic. A pseudo-second-order chemical reaction model was obtained for As(III). Adsorption isotherms of As(III) fitted the Langmuir and Freundlich isotherm models well. From the thermodynamic parameters, it is concluded that adsorption is exothermic, spontaneous and favorable. The results suggest that M1, M2 and Acidic-M2 could be used as effective filtering materials for removal of arsenic from water.This work has been financed by the AECID (projects AECID-PCI A/019533/08, A/023858/09 and C/031332/10) and Ministerio de Ciencia e Innovación (project MAT2010-15273). The National Agency for the Development of University Research (CRSTRA), the Directorate General of Scientific Research and Technological Development (DGRSDT) of Algeria.Zehhaf, A.; Benyouncef, A.; Quijada Tomás, C.; Taleb, S.; Morallón, E. (2012). Kinetic and thermodynamic study of the adsorption of As(III) from aqueous solutions by naturally occurring and modified montmorillonites. Biointerface Research in Applied Chemistry. 2(3):350-359. http://hdl.handle.net/10251/51537S3503592

Studies on the conducting nanocomposite prepared by polymerization of 2-aminobenzoic acid with aniline from aqueous solutions in montmorillonite

A simple and facile method was used to synthesize poly(o-aminobenzoic acid) (PoABA) and polyaniline (PANI) nanocomposites with sodium montmorillonite (M-Na) using in situ intercalative oxidative homo-, and co-polymerization by a substoichiometric amount of ammonium persulfate. The conductive emeraldine salt form of all polymers used is inserted into the layers of M-Na to produce the hybrid with high conductivity. The properties of the hybrid are characterized by X-ray diffraction (XRD), Fourier transform Infrared (FT-IR), thermogravimetric (TG), X-ray photoelectron spectroscopy (XPS), and electrochemical response; the results show that what we obtain is really a nanocomposite. © 2012 Elsevier B.V.This work was supported by the National Agency for the Development of University Research (ANDRU), the Directorate General of Scientific Research and Technological Development (DGRSDT) of Algeria and the Departamento de Quimica Fisica e Instituto Universitario de Materiales, Universidad de Alicante (Spain).Belmokhtar, A.; Benyoucef, A.; Zehhaf, A.; Yahiaoui, A.; Quijada Tomás, C.; Morallón, E. (2012). Studies on the conducting nanocomposite prepared by polymerization of 2-aminobenzoic acid with aniline from aqueous solutions in montmorillonite. Synthetic Metals. 162(21-22):1864-1870. doi:10.1016/j.synthmet.2012.08.014S1864187016221-2

Lead ion adsorption from aqueous solutions in modified Algerian montmorillonites

The adsorption of lead (II) ions on three Algerian montmorillonites (sodium, non-sodium, and acidic-activated) was studied. Transmission electron microscopy coupled with energy dispersive X-ray analysis, X-ray fluorescence and physical adsorption of gases were used to characterize the clays. This characterization has shown than the activation with acid increases the surface area as a consequence of the rupture of the laminar structure. The effect of the pH in the lead adsorption capacity was analyzed. The results show that adsorption is strongly depended on the pH. At low pH values, the mechanism that governs the adsorption behavior of clays is the competition of the metal ions with protons. Between pH 2 and 6, the main mechanism is an ion exchange process. The kinetics of the adsorption is tested with respect to pseudo-first-order and second-order models. The adsorption process, gives a better fit with the Langmuir isotherm, being the monolayer capacity ranging between 18.2 and 24.4 mg g(-1). The adsorption of lead decreased in the order Acidic-M-2 > M-2 > M-1. Thermodynamic parameters such as Delta H, Delta S, and Delta G were calculated. The adsorption process was found to be endothermic and spontaneous. The enthalpy change for Pb(II) by M-1 adsorption has been estimated as 60 kJ mol(-1), indicating that the adsorption of Pb(II) by all montmorillonites used corresponds to a physical reaction. The adsorption capacity of washed Acidic-M-2 was very high compared to M-2 and M-1.This study has been financed by the AECID (projects AECID-PCI A/019533/08 and A/023858/09) and Ministerio de Ciencia e Innovacion (project MAT2010-15273). 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