Study of adsorption and preconcentration by using a new silica organomodified with [3-(2,2′-dipyridylamine)propyl] groups
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In this work, a silica surface chemically modified with [3-(2,2′-dipyridylamine)propyl] groups, named [3-(2,2′- dipyridylamine)propyl]silica (Si-Pr-DPA) was prepared, characterized, and evaluated for its heavy metal adsorption characteristics from aqueous solution. To our knowledge, we are the first authors who have reported the present modification. The material was characterized using infrared spectroscopy, SEM, and NMR 29Si and 13C solid state. Batch and column experiments were conducted to investigate for heavy metal removal from dilute aqueous solution by sorption onto Si-Pr-DPA. From a number of studies the affinity of various metal ions for the Si-Pr-DPA sorbent was determined to follow the order Fe(III) > Cr(III) >> Cu(II) > Cd(II) > Pb(II) > Ni(II). Two standard reference materials were used for checking the accuracy and precision of the method. The proposed method was successfully applied to the analysis of environmental samples. This ligand material has great advantage for adsorption of transition-metal ions from aqueous medium due to its high degree of organofunctionalization associated with the large adsorption capacity, reutilization possibility, and rapidity in reaching the equilibrium. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Adsorption, Isotherms, Metal, Preconcentration, Silica, Accuracy and precision, Adsorption capacities, Aqueous medium, Chemically modified, Column experiments, Dilute aqueous solution, Dipyridylamine, Environmental sample, Heavy metal adsorption, Heavy metal removal, Organo-functionalization, Pre-concentration, Re-utilization, Silica surface, Standard reference material, Chromium compounds, Infrared spectroscopy, Iron compounds, Isomers, Lead, Metal ions, Metals, Silicon, Transition metals, [3 (2,2' dipyridylamine)propyl] silica, chromium, cupric ion, ferric ion, lead, nickel, silicon dioxide, unclassified drug, 29Si NMR, accuracy, adsorption, carbon nuclear magnetic resonance, chemical analysis, chemical structure, heavy metal removal, infrared spectroscopy, isotherm, nuclear magnetic resonance, priority journal, scanning electron microscope, scanning electron microscopy, synthesis
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Inglês
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Journal of Separation Science, v. 36, n. 4, p. 817-825, 2013.
