在形成络合物的二价阳离子存在下,螯合纤维吸附剂的滴定

Q4 Chemistry
V. Soldatov, T. A. Korshunova, E. Kosandrovich, P. V. Nesteronok
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引用次数: 1

摘要

在Ni2+、Co2+、Cu2+和Ca2+氯化物存在下,用氢氧化钾在1M KCl溶液中测定了工业聚丙烯腈纤维氮基亚氨基二乙酸基纤维螯合吸附剂的h型滴定曲线。所使用的方法可以同时测量溶液的pH值和滴定曲线上每一点的二价阳离子的浓度。根据这些数据,计算了它们的吸附值与平衡溶液pH的关系。在所有情况下,直接滴定和反滴定曲线几乎一致。随着滴定过程中pH值的变化,在相应的氢氧根沉淀的pH值处观察到沉淀。在这种情况下,通过向滴定池中加入碱,pH的增加被暂停或大大减缓。当离子交换器被金属离子饱和时,沉淀主要发生在Co2+和Ni2+ (pH为8)的溶液中。在Cu2+(沉淀形成pH为4)的情况下,由于羧基的电离和沉淀的部分溶解,在较低和较高的pH下都发生Cu2+的吸附。在所有情况下,Ni2+, Co2+, Cu2+, Ca2+的最大吸附对应于R-N (CH2COO-)2Me2+型吸附配合物的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Titration of chelating fibrous sorbent in the presence of complex-forming divalent cations
Titration curves of H-forms of the fibrous chelating sorbent with iminodiacetic groups based on industrial polyacrylonitrile fiber Nitron with potassium hydroxide in 1M KCl solution in the presence of Ni2+, Co2+, Cu2+ and Ca2+ chlorides were obtained. The method used made it possible to simultaneously measure the pH of the solution and the concentration of the divalent cation at each point of the titration curve. From these data, the dependences of their sorption values on the pH of the equilibrium solution were calculated. The curves of direct and back titration practically coincided in all cases. As the pH changed during titration, precipitation was observed at pH values of precipitation of the corresponding hydroxides. In this case, the increase in pH was suspended or greatly slowed down by adding alkali to the titration cell. The formation of a precipitate occurred mainly in a solution for Co2+ and Ni2+ (pH 8), when the ion exchanger was saturated with a metal ion. In the case of Cu2+ (precipitate formation pH 4), Cu2+ sorption occurs at both lower and higher pH due to ionization of carboxyl groups and partial dissolution of the precipitate. In all cases, the maximum sorption of Ni2+, Co2+, Cu2+, Ca2+ corresponded to the formation of sorption complexes of the R–N(CH2COO-)2Me2+ type.
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来源期刊
CiteScore
0.30
自引率
0.00%
发文量
38
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