المساهمة في دراسة تشخيص وتثمين مخلفات نخيل الغرس

Résumé: This work consists of six chapters, and devoted to study and valorize of some Date Palm By-Products, (named locally by: kernaf – saaf – lif – sagh elarjon – chemarikh), in the first step we have used them completely as cheap biosorbents of organic pollutants, (like the case of methylene blue removal from water), we have also paid attention to the Kinetic and thermodynamic studies of this adsorption, in order to determine the optimum conditions and achieve the best results. In addition, we have performed an extensive characterization of Date palm by-Products by several techniques like: (SEM) to check their morphological forms, (XRD) to determine crystallinity percentage and (EDS) to measure their chemical compositions, and others. Lately we have used their components separately, of course after the extraction, (Hemicellulose - cellulose and Nanocellulose), with and without the chemical modification to convert them to several materials. The extracted cellulose, on the first hand, is converted to Carboxymethylcellulose, by applying Experimental Design, using Response surface methodology ( Box-Behnken design) to optimize the product and reaching highest degree of substitution (DS), after determining the optimal conditions of : the reaction temperature - reaction time - the proportion of SMCA - the proportion of the reaction medium (isopropanol / ethanol) and as well as the concentration of (NaOH). On the other hand, to derive the micro and Nanocellulose by the hydrolysis of extracted cellulose , and then chemically processed and combined with Polypyrrole by polymerization reaction (in situ) for the preparation of composite materials, which were used into the supercapacitors fabrication, they are electrical energy storage means, our results were very promising in the way of energy storage. Finally, the extracted Hemicellulose has been used as green inhibitor of carbon steel corrosion in acidic medium, the investigation of its effectiveness has been studied by the Potentiodynamic polarization (represented in the Tafel curves) and the electrochemical impedance spectroscopy.

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