Thesis Chapters by Rim Kaabi
V.3. Conclusion _______________________________________________________________ Références biblio... more V.3. Conclusion _______________________________________________________________ Références bibliographiques ____________________________________________________ Chapitre VI. Synthèse de nanoparticules de silice mésoporeuses fonctionnalisées par le glygylglycine pour la détection du Ni(II) par voie électrochimique. __________________ VI.1. Introduction _____________________________________________________________ 106 VI.1.1. Le support silicaté : les nanparticules de silice mésoporeuses MSN ________________________ VI .1.2. Le glycylglycine _________________________________________________________________ VI.1.3. Le nickel dans l'environnement et dans le corps humain ________________________________ VI.2. Partie expérimentale ______________________________________________________ VI.2.1. Synthèse des nanparticules de silice mésoporeuses fonctionnalisées par le glycylglycine MSN-NH-GlyGly ______________________________________________________________________________ VI.2.1.1. Synthèse des nanparticules de silice mésoporeuses MSN ____________________________ VI.2.1.2. Synthèse des nanparticules de silice mésoporeuses activées par les groupem-ents amines MSN-NH 2 __________________________________________________________________________ VI.2.1.3. Greffage du glycylglycine sur les nanoparticules de silice mésoporeuses MSN-NH-GlyGly __ VI.
Papers by Rim Kaabi
Microporous and Mesoporous Materials, 2016
In this work, glutathione was grafted on mesoporous silica materials by silanization with (3merca... more In this work, glutathione was grafted on mesoporous silica materials by silanization with (3mercaptopropyl)trimethoxysilane, subsequent reaction with 2,2 0-dipyridyldisulphide and a final treatment with glutathione. The obtained glutathione-functionalized materials have been characterized by powder X-ray diffraction, FT-IR, scanning electron microscopy, transmission electron microscopy, nitrogen gas sorption and X-ray fluorescence. In addition, the hybrid materials were used in the preparation of modified carbon paste electrodes MCPE by mixing quantities of glutathione-containing materials with paraffin oil and graphite for Cd(II) detection in aqueous media by square wave adsorptive stripping voltammetry. Two materials were used for the preparation of MCPE, (A) the first material was obtained by the grafting of glutathione on the pyridyldisulphide pending ligand of the mesoporous material, (B) the second one, was obtained by grafting a cadmium-glutathione complex on the pyridyldisulphide pending ligand of the mesoporous material. For the latter, elimination of cadmium ions was carried out by treatment with HCl 2 M for 2 h and wash with MilliQ water before preparing the MCPE. To achieve the most accurate and sensitive Cd(II) electrochemical measurements, optimization of the operating parameters in pre concentration and detection steps was performed. The responses are pH dependent, being the optimal conditions 120 s of electrolysis time in buffer solution (pH 6.4). The voltammetric responses increase linearly with the pre concentration time and with metal ion concentrations ranging from 1 to 100 ppb. The metal detection limits were 2 and 4 ppb for materials (A) and (B), respectively, after 5 min pre concentration time.
Uploads
Thesis Chapters by Rim Kaabi
Papers by Rim Kaabi