Titration of weak base fibrous anion exchangers in the presence of complex-forming divalent cations

Q4 Chemistry
V. Soldatov, L. N. Shachenkova, E. Kasandrovich, P. V. Nesteronok
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引用次数: 0

Abstract

Curves of potentiometric titration of fully protonized fibrous ion exchangers with potassium hydroxide against the background of 1 M KCl in the presence of chlorides of Ni2+, Со2+, Сu2+ and Ca2+ were obtained. The ion exchangers were synthesized by modifying of industrial polyacrylonitrile fiber with diethylenetriamine and triethylenetetraamine and predominantly contained functional groups R-CO-NH- (CH2CH2NH)nH (n = 2 or 3) and a small amount of carboxyl groups. The sorption of Ni2+, Со2+, Сu2+ и Ca2+by ion exchangers was calculated from the data obtained depending on the pH of the medium. It was found that the investigated ion exchangers with high selectivity sorb heavy metal ions in a wide range of acidity of solutions (pH 2–9) due to the formation of metal-polymer complexes with polyamine functional groups. The maximum sorption capacity is 1.5–2.7 and 4–5 meq/g for ion exchangers with n = 2 and 3, respectively.
弱碱纤维阴离子交换剂在形成络合物的二价阳离子存在下的滴定
得到了在1 M KCl背景下,在Ni2+、Со2+、Сu2+和Ca2+等氯化物存在下,氢氧化钾对全质子化纤维离子交换剂的电位滴定曲线。采用二乙烯三胺和三乙烯四胺对工业聚丙烯腈纤维进行改性,合成了以R-CO-NH- (CH2CH2NH)nH (n = 2或3)为主官能团和少量羧基为主的离子交换剂。离子交换剂对Ni2+, Со2+, Сu2+, Ca2+的吸附量根据介质的pH值计算。结果表明,所研究的离子交换剂通过与多胺官能团形成金属-聚合物配合物,在较宽的酸度范围(pH 2 ~ 9)内具有较高的选择性吸附重金属离子。当n = 2和3时,离子交换剂的最大吸附量分别为1.5 ~ 2.7和4 ~ 5 meq/g。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
0.30
自引率
0.00%
发文量
38
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