title: Organically modified silica with pyrazole-3-carbaldehyde as a new sorbent for solid-liquid extraction of heavy metals.
abstract: A new chelating matrix, SiNP, has been prepared by immobilizing 1.5-dimethyl-1H-pyrazole-3-carbaldehyde on silica gel modified with 3-aminopropyl-trimethoxysilane. This new chelating material was well characterized by elemental analysis, FT-IR spectroscopy, cross polarization magic angle spinning solid state 13C-NMR, nitrogen adsorption-desorption isotherm, BET surface area, BJH pore size, and scanning electron microscopy (SEM). The new product exhibits good chemical and thermal stability as determined by thermogravimetry curves (TGA). The new prepared material was used as an adsorbent for the solid-phase extraction (SPE) of Pb(II), Cd(II), Cu(II) and Zn(II) from aqueous solutions using a batch method, prior to their determination by flame atomic adsorption spectrometry. The adsorption capacity was investigated using kinetics and pH effects. Common coexisting ions did not interfere with separation and determination.
authors.affiliation: Laboratoire de Chimie Appliquée et Environnement (LCAE), Faculté des Sciences, Université Mohamed I, Oujda 60 000, Morocco. radi_smaail@yahoo.fr.
authors.forename: Smaail
authors.initials: S
authors.lastname: Radi
authors.forename: Said
authors.initials: S
authors.lastname: Tighadouini
authors.forename: Maryse
authors.initials: M
authors.lastname: Bacquet
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Degoutin
authors.forename: Francine
authors.initials: F
authors.lastname: Cazier
authors.forename: Mustapha
authors.initials: M
authors.lastname: Zaghrioui
authors.forename: Yahia N
authors.initials: YN
authors.lastname: Mabkhot
mesh_terms: D000327:Adsorption; D005591:Chemical Fractionation; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D019906:Nuclear Magnetic Resonance, Biomolecular; D011720:Pyrazoles / Q000737:chemistry*; D058428:Silica Gel / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013818:Thermogravimetry
chemical_list: D019216:Metals, Heavy; D011720:Pyrazoles; C031280:pyrazole; D058428:Silica Gel; D012822:Silicon Dioxide