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.
Highlights
Environment pollution by heavy metals has caused lately much concern because of their general and specific toxicities
In continuation of our work in this field [29,30,31,32], this paper describes the synthesis and the characterization of a new material obtained by grafting onto porous silica functionalized compounds which can act as in a
The synthetic procedure for the new chelating material is summarized in Scheme 1
Summary
Environment pollution by heavy metals has caused lately much concern because of their general and specific toxicities. The most commonly attached molecules have chelating ability due to their donor atoms, such as oxygen, nitrogen and sulphur, which have a large capability to form complexes with a series of metal ions, leading in some cases, to distinguishable selective extraction properties. In this context, for many years, the ability of pyrazole and its derivatives to act as ligands with sp hybrid nitrogen donors have been the research subjects of many coordination chemists. This new material presents high adsorption of lead compared to the other tested metals ions
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