Adsorption Equilibria of Silver(I) and Copper(II) Ions on N-(2-Hy dr oxylbenzy l)chitosan D erivative
Adsorption Equilibria of Silver(I) and Copper(II) Ions on N-(2-Hy dr oxylbenzy l)chitosan D erivative
复制标题
N-(2-羟基苄基)壳聚糖衍生物上银(I)和铜(II)离子的吸附平衡
DOI：
10.2116/analsci.10.601
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发表时间：
1994
影响因子：
1.6
通讯作者：
Y. Kawano
中科院分区：
文献类型：
--
作者：
Y. Baba;H. Hirakawa;K. Yoshizuka;Katsutoshi Inoue;Y. Kawano
JV-(2-Hydroxybenzyl)chitosan (=HR) of an insoluble chitosan derivative was synthesized by reducing N -(2-hydroxy-benzylidene)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 303 K. The chelating ability of N -(2-hydroxybenzyl)chitosan for various metal ions was measured by a batchwise operation from 1 mol 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. Since AT-(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: $$AgNH_3^ + + \overline {HR} \overline {RAgN{H_3}} + {H^ + }$$ while, copper(U) was adsorbed according to the following reactions: $$C{u^{2 + }} + 2\overline {HR} \overline {{R_2}Cu} + 2{H^ + }and\,CuNH_3^{2 + } + 2\overline {HR} \overline {{R_2}CuN{H_3}} + 2{H^ + }.$$
JV-(2-Hydroxybenzyl)chitosan (=HR) of an insoluble chitosan derivative was synthesized by reducing N -(2-hydroxy-benzylidene)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 303 K. The chelating ability of N -(2-hydroxybenzyl)chitosan for various metal ions was measured by a batchwise operation from 1 mol 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. Since AT-(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: $$AgNH_3^ + + \overline {HR} \overline {RAgN{H_3}} + {H^ + }$$ while, copper(U) was adsorbed according to the following reactions: $$C{u^{2 + }} + 2\overline {HR} \overline {{R_2}Cu} + 2{H^ + }and\,CuNH_3^{2 + } + 2\overline {HR} \overline {{R_2}CuN{H_3}} + 2{H^ + }.$$