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Type: Artigo de periódico
Title: Designed pendant chain covalently bonded to silica gel for cation removal
Author: Dey, RK
Airoldi, C
Abstract: The precursor 1,4-bis(3-aminopropyl)piperazine organofunctionalized silica gel reacted with methylacrylate to yield a new inorganic-organic chelating material, by adopting a heterogeneous and divergent synthetic approach. The synthesized materials were characterized through elemental analyses and spectroscopic techniques such as infrared, nuclear magnetic nuclei of carbon-13 and silicon-29. Due to the increment of basic centers attached to the pendant chains the metal adsorption capability of the final chelating material, was found to be higher than its precursor. The adsorption of metal ions from aqueous solution followed the order Cu2+ > Ni2+ > Co2+. Both Langmuir and Freundlich models were found to be applicable for the adsorption of copper, with the equilibrium parameter value within zero to one. The competitive sorption behavior, with variation of pH, was favorable for the separation of copper from binary mixtures with nickel and cobalt. When sodium, potassium and magnesium cations are present in the medium little effects on adsorption were observed, thus suggesting that the synthesized material can be useful for removal of toxic/heavy metal ions from natural and wastewater systems. (C) 2007 Elsevier B.V. All rights reserved.
Subject: silica gel
cation removal
chelating material
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Hazardous Materials. Elsevier Science Bv, v. 156, n. 41699, n. 95, n. 101, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2007.12.005
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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