Adsorption Equilibria of Silver(I) and Copper(II) Ions on N-(2-Hydroxylbenzyl)chitosan Derivative

Yoshinari BABA; Hiroyuki HIRAKAWA; Kazuharu YOSHIZUKA; Katsutoshi INUOE; Yoshinobu KAWANO

doi:10.2116/analsci.10.601

Yoshinari BABA, Hiroyuki HIRAKAWA, Kazuharu YOSHIZUKA, Katsutoshi INUOE, Yoshinobu KAWANO

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Keywords: Chitin, chitosan, chitosan derivative, chitosan-metal chelate, adsorption equilibrium, adsorbed species, silver(I), copper(II)

JOURNAL FREE ACCESS

1994 Volume 10 Issue 4 Pages 601-605

DOI https://doi.org/10.2116/analsci.10.601

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Published: August 10, 1994 Received: March 22, 1994 Available on J-STAGE: July 04, 2006 Accepted: May 09, 1994 Advance online publication: - Revised: -
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Date of correction: July 04, 2006 Reason for correction: - Correction: ABSTRACT Details: Wrong : N-(2-Hydroxybenzyl)chitosan (=HR) of an insoluble chitosan derivative was synthesized by reducing N-(2-hydroxybenzylidene) chitosan obtained from chitosan and 2-hydroxybenzaldehyde. We examined its adsorption selectivities for various metal ions in terms of the pH dependence of the distribution ratio of metal ions at 303K. The chelating ability of N-(2-hydroxybenzyl)chitosan for various metal ions was measured by a batchwise operation from 1mol dm^-3 of ammonium nitrate solution. The separations of gallium and iron(III) from zinc, and nickel from cobalt were possible because of the high selectivity of the present derivative. SinceN-(2-hydroxybenzyl)chitosan showed the high adsorption abilities for silver(I) and Copper(II), the adsorption equilibria of both silver(I) and copper(II) were investigated in order to elucidate the adsorbed species by examining the concentration dependencies of hydrogen ion and
ammonium nitrate. Silver(I) was adsorbed according to this adsorption reaction, accompanied by an ammonia molecule: AgNH₃⁺+HR_??_RAgNH₃+H⁺ while, copper(II) was adsorbed according to the following reactions: Cu²⁺+2HR_??_R₂Cu+2H⁺ and CuNH₃^{2++2HR_??_R₂CuNH₃+2H⁺.
Right : N-(2-Hydroxybenzyl)chitosan (=HR) of an insoluble chitosan derivative was synthesized by reducing N-(2-hydroxybenzylidene) chitosan obtained from chitosan and 2-hydroxybenzaldehyde. We examined its adsorption selectivities for various metal ions in terms of the pH dependence of the distribution ratio of metal ions at 303K. The chelating ability of N-(2-hydroxybenzyl)chitosan for various metal ions was measured by a batchwise operation from 1mol dm^-3 of ammonium nitrate solution. The separations of gallium and iron(III) from zinc, and nickel from cobalt were possible because of the high selectivity of the present derivative. SinceN-(2-hydroxybenzyl)chitosan showed the high adsorption abilities for silver(I) and Copper(II), the adsorption equilibria of both silver(I) and copper(II) were investigated in order to elucidate the adsorbed species by examining the concentration dependencies of hydrogen ion and
ammonium nitrate. Silver(I) was adsorbed according to this adsorption reaction, accompanied by an ammonia molecule: AgNH₃⁺+HR_??_RAgNH₃+H⁺ while, copper(II) was adsorbed according to the following reactions: Cu²⁺+2HR_??_R₂Cu+2H⁺ and CuNH₃²⁺+2HR_??_R₂CuNH₃+2H⁺.}

Date of correction: July 04, 2006 Reason for correction: - Correction: PDF FILE Details: -

Abstract

N-(2-Hydroxybenzyl)chitosan (=HR) of an insoluble chitosan derivative was synthesized by reducing N-(2-hydroxybenzylidene) chitosan obtained from chitosan and 2-hydroxybenzaldehyde. We examined its adsorption selectivities for various metal ions in terms of the pH dependence of the distribution ratio of metal ions at 303K. The chelating ability of N-(2-hydroxybenzyl)chitosan for various metal ions was measured by a batchwise operation from 1mol dm^-3 of ammonium nitrate solution. The separations of gallium and iron(III) from zinc, and nickel from cobalt were possible because of the high selectivity of the present derivative. SinceN-(2-hydroxybenzyl)chitosan showed the high adsorption abilities for silver(I) and Copper(II), the adsorption equilibria of both silver(I) and copper(II) were investigated in order to elucidate the adsorbed species by examining the concentration dependencies of hydrogen ion and
ammonium nitrate. Silver(I) was adsorbed according to this adsorption reaction, accompanied by an ammonia molecule: AgNH₃⁺+HR_??_RAgNH₃+H⁺ while, copper(II) was adsorbed according to the following reactions: Cu²⁺+2HR_??_R₂Cu+2H⁺ and CuNH₃²⁺+2HR_??_R₂CuNH₃+2H⁺.

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