Pre-concentration of Cd(II), Cr(III), Cu(II) and Ni(II) on a column packed with free carboxymethylcellulose (CMCH)

Abstract

Pe dro de Ma ga lhães Pa di lha a , Ju lio Ce sar Ro cha b , Jo a quim T.S. Cam pos b , José Cel so Mo re i ra b , and Ci le ne C. Fe de ri ci b a De par ta men to de Qu í mi ca, Insti tu to de Bi o ciên ci as, UNESP, Bo tu ca tu, C.P. 510,

Synthesis, characterization and determination of the metal ions adsorption capacity of cellulose modified with p-aminobenzoic groups

“…One important aspect of metal separation in ion exchangers is the rate at which the exchanger adsorbs metal cations from the solutions and the time required to reach equilibrium 3,6,7 . As a typical example of metal separation on Cell-PAB, Fig.…”

“…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] . Cellulose is a particularly attractive solid support because of its mechanical and chemical stability and its availability in pure and diverse physical forms.…”

“…Thus, functional groups containing nitrogen 1,2 , sulfur 9 , oxygen 3,4 and phosphorus 6 arranged in cellulose chains render the surface useful for a variety of academic and industrial applications. Moreover, 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 .…”

“…Moreover, 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 . 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.…”

Determination of Copper after Preconcentration as Its 1-Nitroso-2-naphthol Complex onto Activated Carbon

“…To determine trace metals in real samples, a separation and preconcentration technique is frequently required, because of the trace amount of analyte ions and the presence of interference. 7,8 For the preconcentration and separation of copper(II) ion, various solid adsorbents such as Amberlite XAD-16 resin, 9 silica gel, 10 and benzophenone 11 have been used. These adsorbents have good preconcentration yields and high recovery yields for some copper(II) complexes.…”