Abstract
This paper describes the synthesis and characterization of p-aminobenzoic modified cellulose (Cell-PAB), as well as the separation and preconcentration of Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) ions from an aqueous medium using a Cell-PAB bath and the column technique. The quantity of p-aminobenzoic groups attached to the cellulose surface, i.e., 1.81±0.04 mmol/g, was determined by elemental analysis. The FT-IR spectra of Cell-PAB revealed characteristic bands of p-aminobenzoic groups, indicating the desired functionalization of the cellulose surface. The adsorptive capacities for the metals (Ns) Cd, Cu, Ni, Pb and Zn (Ns) were, respectively, 1.72 ± 0.02, 1.96 ± 0.02, 1.88 ± 0.04, 2.01 ± 0.03 and 1.93 ± 0.03 mmol/g. Metal separations performed in flow experiments using a column packed with 1 g of Cell-PAB and 5 mL of 1.5 mol/L HCl solution as eluent achieved an almost 100% metal ions recovery rate.
Highlights
Preconcentration by separation of dissolved trace element ions onto a chemically modified solid support has been studied intensively in recent years[1,2,3,4,5,6,7,8,9,10,11,12,13]
This paper reports on the synthesis and characterization of p-aminobenzoic modified cellulose (Cell-PAB) aiming to find an efficient material for the separation and pre-concentration of Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) ions from an aqueous medium
The quantity of p-aminobenzoic groups attached to the cellulose surface was determined by nitrogen elemental analysis, using a SHIMADZU EA-2218 CHNS-O elemental analyzer
Summary
Preconcentration by separation of dissolved trace element ions onto a chemically modified solid support has been studied intensively in recent years[1,2,3,4,5,6,7,8,9,10,11,12,13]. The majority of these anchored molecules contain nitrogen or oxygen or a combination of the two, which can bind metal ions in mono- or polydentate fashion[1,2,3,4,7,10,12,13]. Some of these modified cellulose surfaces facilitate the extraction of metal ions from aqueous and non-aqueous mediums[2,3,6,7,10]. The metals Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) were determined in river water samples through a combination of the Cell-PAB flow system with flame atomic absorption spectrometry (FAAS)
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