SciELO - Scientific Electronic Library Online

 
vol.7 issue2High frequency dielectric relaxation in lanthanum modified PbTiO3 ferroelectric ceramicsInfluence of high sintering pressure on the microhardness and wear resistance of diamond powder and silicon carbide-based composites author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Materials Research

Print version ISSN 1516-1439

Abstract

CASTRO, Gustavo Rocha de et al. Synthesis, characterization and determination of the metal ions adsorption capacity of cellulose modified with p-aminobenzoic groups. Mat. Res. [online]. 2004, vol.7, n.2, pp. 329-334. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392004000200018.

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.

Keywords : modified cellulose; separation of heavy metals; preconcentration; adsorption; p-aminobenzoic groups.

        · text in English     · pdf in English