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Nakhli A.,Laboratoire Of Physique Quantique | Khalfaoui M.,Laboratoire Of Physique Quantique | Aguir C.,Laboratoire Of Chimie Appliquee Et Environnement | Bergaoui M.,Laboratoire Of Physique Quantique | And 2 more authors.
Separation Science and Technology (Philadelphia) | Year: 2014

In this article, finite multilayer adsorption modeling was presented. The grand canonical formalism was used to establish a novel finite multilayer with multisite occupancy model. Expression for the physico-chemical parameters involved in the adsorption phenomena were derived based on statistical physics treatment. This model has been applied to one of the most challenging adsorption in liquid phase, i.e., Basic Bleu 41 dye adsorption onto raw and modified Posidonia biomass. The parameters involved in the analytical expression of the multilayer model such as the number of adsorbed molecules per site, the density of occupied receptor sites, and the number of adsorbed layers were determined by fitting the experimental adsorption isotherms at temperatures ranging from 303 to 353 K. Fitting results show that the dye molecules are multimolecular adsorbed onto Posidonia surface. Furthermore, the new approach leads us to quantify the mean number of adsorbed layers. The magnitudes of the calculated adsorption energy indicate that BB41 dye is physisorbed onto Posidonia adsorbent. © Taylor & Francis Group, LLC.

Barouni K.,Laboratoire Materiaux et Environnement | Kassale A.,Laboratoire Materiaux et Environnement | Albourine A.,Laboratoire Materiaux et Environnement | Jbara O.,CNRS Laboratory of Engineering and Materials Science | And 3 more authors.
Journal of Materials and Environmental Science | Year: 2014

The corrosion inhibition of copper in 1 M HNO3 was studied by gravimetric and potentiodynamic polarization by use of amino acids such as : Acid aspartic (Asp), Acid Glutamic (Glu), Alanine (Ala), Asparagine (Asn), Glutamine (Gln), Leucine (Leu), Methionine (Met), and Threonine (The). The results obtained the from two different techniques are comparable, and show that Met is the best inhibitor for the corrosion of copper in 1M HNO3. Correlation between inhibition efficiency and quantum chemical calculations using semi empirical (AM1 and MNDO) and ab-initio methods is discussed.

Barakat A.,King Saud University | Al-Noaimi M.,Hashemite University | Suleiman M.,An Najah National University | Aldwayyan A.S.,King Saud University | And 5 more authors.
International Journal of Molecular Sciences | Year: 2013

[NiCl2(C14H12N2)(H2O)] complex has been synthesized from nickel chloride hexahydrate (NiCl2·6H2O) and 2,9-dimethyl-1,10-phenanthroline (dmphen) as N,N-bidentate ligand. The synthesized complex was characterized by elemental analysis, infrared (IR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and differential thermal/thermogravimetric analysis (TG/DTA). The complex was further confirmed by single crystal X-ray diffraction (XRD) as triclinic with space group P-1. The desired complex, subjected to thermal decomposition at low temperature of 400 °C in an open atmosphere, revealed a novel and facile synthesis of pure NiO nanoparticles with uniform spherical particle; the structure of the NiO nanoparticles product was elucidated on the basis of Fourier transform infrared (FT-IR), UV-vis spectroscopy, TG/DTA, XRD, scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDXS) and transmission electron microscopy (TEM). © 2013 by the authors; licensee MDPI, Basel, Switzerland.

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