Characterization and Application of 1-(2-Pyridylazo)-2-naphthol Functionalized Amberlite XAD-4 for Preconcentration of Trace Metal Ions in Real Matrices

Abstract

Amberlite XAD-4 resin (AXAD-4) has been functionalized by coupling it through an NN group with 1-(2-pyridylazo)-2-naphthol (PAN). The resulting chelating resin, PAN-AXAD-4, has been characterized by using elemental and thermogravimetric analysis, infrared spectra, water regain value, and hydrogen ion capacity. The sorption capacity was found to be (285, 145, 135, 85, and 76) μmol·g−1 for Zn(II), Co(II), Ni(II), Cu(II), and Pb(II), respectively. The kinetics was studied at different temperatures, and the corresponding rate constants were also determined. All the metals could be eluted with 5 mL of HNO3 resulting in a high preconcentration factor of 300 to 500. The detection limits were found to be (0.65, 0.80, 0.85, 0.95, and 1.40) μg·L−1 for Zn(II), Co(II), Ni(II), Cu(II), and Pb(II), respectively. The validity of the method was checked by analyzing standard reference materials and performing recovery studies. The analytical utility of the PAN-AXAD-4 for preconcentration and determination of metal ions was explored by analyzing river, canal, sewage, tap water, multivitamin formulation, and infant milk substitute by direct as well as the standard addition method.

Synthesis and application of calixarene-based functional material for arsenic removal from water

“…The volume of processed water at breakthrough point also increases by increasing concentration. At higher initial concentration of As(III) the rate of sorption become faster due to increase in driving force and faster coverage of the active sites (Islam et al 2010).…”

Characterization of a chelating resin functionalized via azo spacer and its analytical applicability for the determination of trace metal ions in real matrices

“…SA functionalized Amberlite XAD‐4 resin (AXAD‐4‐SA) was prepared through azo spacer as reported earlier 32. The synthesis was carried out according to the following sequence: nitration, amination, diazotization, and azotisation (Scheme ).…”

A perspective on diverse adsorbent materials to recover precious palladium and the way forward

“…Macroporous resins were rst developed in the 1960s and due to their polymeric matrix they are capable of enhancing the adsorption capacity and ease of accessing chelating sites for a range of metal ions. 95,96 They are basically based on polystyrene-divinyl benzene (PSDVB) and polyacrylatedivinylbenzene (PADVB) copolymers. The most widespread kind of macroporous resin is styrene and divinylbenzene copolymer, which may be found as 'polystyrene-divinylbenzene copolymer'.…”

“…Amberlite XAD resin series gied with a polystyrene divinyl benzene matrix act as an effective support to anchor coordinating ligands due to their properties such as high surface area, porosity and higher physical and chemical stability. 55,95 The native form of the resin does not possess any functional group fundamentally and therefore appropriate modication is needed in order to generate suitable sites which in turn would increase the interaction with metal ions. Polystyrenedivinylbenzene resins and polyacrylate-divinylbenzene resins have their own nature among which the former ones are nonpolar and hence hydrophobic, whereas the later ones are moderately polar and thus hydrophilic.…”