title: C,N-bipyrazole receptor grafted onto a porous silica surface as a novel adsorbent based polymer hybrid.
abstract: A simple heterogeneous synthesis of pure adsorbent based polymer hybrid made by condensing a functionalized C,N-bipyrazole with a 3-glycidoxypropyl-trimethoxysilane silylant agent, previously anchored on a silica surface was developed. The formed material (SG2P) was characterized through elemental analysis, FT-IR spectroscopy, (13)C NMR of solid state, scanning electron microscope (SEM), and was studied and evaluated by determination of the surface area using the BET equation, the adsorption and desorption capability using the isotherm of nitrogen and B.J.H. pore sizes. The new material exhibits good thermal stability determined by thermogravimetry curves and good chemical stability was examined in various acidic and buffer solutions (pH 1-7). The binding and adsorption abilities of SG2P were investigated for Hg(2+), Cd(2+), Pb(2+), Zn(2+), K(+), Na(+) and Li(+) cations and compared to the results of classical liquid-liquid extraction with the unbound C,N-bipyrazole compound. The grafting at the surface of silica does not affect complexing properties of the ligand and the SG2P exhibits a high selectivity toward Hg(2+) ion with no complexation being observed towards zinc and alkali metals. The extracted and the complexing cation percentages were determined by atomic absorption measurements.
authors.affiliation: Laboratoire de Chimie Appliquée et Environnement (LCAE), Faculté des Sciences, Université Mohamed I, 60 000 Oujda, Morocco; Centre de l'Oriental des Sciences et Technologies de l'Eau (COSTE), Université Med I, 60 000 Oujda, Morocco. Electronic address: radi_smaail@yahoo.fr.
authors.forename: Smaail
authors.initials: S
authors.lastname: Radi
authors.affiliation: Laboratoire de Chimie Appliquée et Environnement (LCAE), Faculté des Sciences, Université Mohamed I, 60 000 Oujda, Morocco.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Attayibat
authors.affiliation: Laboratoire de Chimie Appliquée et Environnement (LCAE), Faculté des Sciences, Université Mohamed I, 60 000 Oujda, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: El-Massaoudi
authors.affiliation: Unité Matériaux et Transformations UMR8207 (UMET), Equipe Ingénierie des Systèmes Polymères, Université des Sciences et Technologies de Lille, Bâtiment C6 salle, 119-59655 Villeneuve d'Ascq, France.
authors.forename: Maryse
authors.initials: M
authors.lastname: Bacquet
authors.affiliation: Department of Chemistry, An-Najah National University, P.O. Box 7, Nablus, Palestine. Electronic address: sjodeh@hotmail.com.
authors.forename: Shehdeh
authors.initials: S
authors.lastname: Jodeh
authors.affiliation: Department of Chemistry, An-Najah National University, P.O. Box 7, Nablus, Palestine.
authors.forename: Ismail
authors.initials: I
authors.lastname: Warad
authors.affiliation: Department of Chemistry, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
authors.forename: Salim S
authors.initials: SS
authors.lastname: Al-Showiman
authors.affiliation: Department of Chemistry, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
authors.forename: Yahia N
authors.initials: YN
authors.lastname: Mabkhot
keywords: BET surface; C,N-bipyrazole ligand; Immobilization; Porous silica