A. Nounah
École Normale Supérieure
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Publication
Featured researches published by A. Nounah.
Journal of Environmental Sciences-china | 2008
Noureddine Barka; Samir Qourzal; Ali Assabbane; A. Nounah; Yhya Ait-Ichou
The present study has been undertaken to evaluate the adsorption in batch mode of a disperse dye (Disperse Blue SBL) by poorly crystalline hydroxyapatite synthesized by coprecipitation between Ca(NO3)2 and (NH4)2HPO4 reagents in aqueous solution at room temperature. The adsorption experiments were carried out to investigate the factors that influence the dye uptake by the adsorbent, such as the contact time under agitation, adsorbent dosage, initial dye concentration, solution temperature, and pH. The experimental results show that the percentage of dye removal increases with increasing the amount of adsorbent, until the total discoloration. The adsorption isotherms follow the model of Langmuir with a high adsorption capacity. The adsorption was pH and temperature dependent.
Chemical Engineering Communications | 2011
N. Barka; S. Qourzal; A. Assabbane; A. Nounah; Y. Ait-Ichou
The photocatalytic degradation of patent blue V (sodium salt of [4-(α-(4-diethylaminophenyl)-5-hydroxy-2, 4-disulfophenyl-methylidene)-2, 5-cyclohexadien-1-ylidene] diethylammonium hydroxide) in aqueous solutions has been investigated by using TiO2-coated nonwoven fibers as the photocatalyst. Before the study began, adsorption in the dark was done, and the effect of the initial concentration of dye in the solution was determined. The mineralization was monitored by chemical oxygen demand (COD), and the HPLC-MS method was used to identify reaction intermediates. The experimental results show that adsorption is an important parameter, controlling the apparent kinetic constant of degradation. The rate of fading was favored by a high concentration of dye in the solution with respect to the Langmuir-Hinshelwood model. The COD abatement was slower than the discoloration of the solution; this indicates that the dye was not directly mineralized, but transformed to intermediate photoproducts. These intermediate photoproducts lead to other cycles of degradation, to the point of total mineralization. Several by-products were detected and identified by HPLC-MS. On the basis of these findings, we propose a probable degradation pathway as critical for assessing the suitability of detoxification procedures for the degradation of particular contaminant classes.
Journal of Photochemistry and Photobiology A-chemistry | 2008
Noureddine Barka; Samir Qourzal; Ali Assabbane; A. Nounah; Yhya Ait-Ichou
Journal of Hazardous Materials | 2008
Noureddine Barka; Ali Assabbane; A. Nounah; Y. Aît Ichou
Desalination | 2009
Noureddine Barka; Ali Assabbane; A. Nounah; Larbi Laanab; Yhya Aît Ichou
Journal of Saudi Chemical Society | 2011
Noureddine Barka; Samir Qourzal; Ali Assabbane; A. Nounah; Yhya Ait-Ichou
Materials Science and Engineering: C | 2009
Samir Qourzal; N. Barka; M. Tamimi; Ali Assabbane; A. Nounah; A. Ihlal; Yhya Ait-Ichou
Physical & chemical news | 2008
Noureddine Barka; Ali Assabbane; A. Nounah; J. Dussaud; Y. Ait Ichou
Journal of Applied Sciences | 2006
Noureddine Barka; Ali Assabbane; Y. Ait Ichou .; A. Nounah
Journal De Physique Iv | 2005
A. Nounah; N. Maroufi; Y. Ait Ichou; J.L. Lacout; J.M. Savariault