Abstract
Chemical functionalization of silica gel with 2-((3-silylpropylimino) methyl) phenol (SPIMP) and its application for solid phase extraction and preconcentration of Fe (III), Pb (II), Cu (II), Ni (II), Co (II) and Zn (II) Ions
Highlights
Due to hydrogen ions themselves are strongly compete with metal ions for binding to ligands, the sample acidity affect the protonate binding sites of the chelating molecules at low pH while at high pH hydroxide may hinder complex formation and lead to formation of hydroxide precipitate of metals ions
Some additional characteristic absorption bands at 1635(w), 1567(w), 1490(w) and 693(w) cm-1 are appeared in IR spectrum of silica supported aminopropylsilylate that can be related to bending of NH-bending, NH2-scissoring, CH2-bending and CH2-rocking respectively (Fig. 1(b))
Salicylaldehyde is bounded to silica supported aminopropylsilylate via an iminic bound to obtain a chemically modified silica gel with 2-((3-silylpropylimino) methyl) phenol (SPIMP) as extractor
Summary
For investigating the adsorption isotherms, metal ions solutions with different concentrations (1-20 mg L−1) at different temperatures (10–60 ◦C) were agitated with known amounts of modified silica gel till reaching the equilibrium. Effects of amounts of solid phase To investigate the optimum amount of SPIMP bonded silicagel for the quantitative extraction of the investigated metal ions by the chemically modified silica gel, their extraction was conducted using solid phase containing various amount of solid phase from 0.2 to 1.2 g at pH=5 and 6 mL of HNO3 4 mol L−1 with a flow rate of 4 mL min−1.
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