Kinetics and mechanism of the leaching of sodium from A-terskite and its influence on ion-exchange properties

被引：2
|
作者：
Chukanov, N. V. [1 ]
Tarasov, V. P. [1 ]
Kazakov, A. I. [1 ]
Chervonnaya, N. A. [1 ]
Vozchikova, S. A. [1 ]
Pekov, I. V. [2 ]
机构：
[1] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia
[2] Moscow MV Lomonosov State Univ, Moscow, Russia
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B | 2011年 / 5卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
leaching; cation exchange; ion mobility; terskite; ADSORPTION; REMOVAL;
D O I：
10.1134/S199079311102031X
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
NMR Na-23 spectroscopy, conductometry, calorimetry, and EDs electron microprobe are used to study the ion mobility, the kinetics of the leaching of sodium and the influence of the leaching on the ion-exchange properties of A-terskite (H (x) Na4 - x ZrSi6O15(OH)(2) center dot H2O), a natural microporous material with a high selectivity with respect to Cs+. The leaching of Na+ ions by water is preceded by their transition into a mobile state in the zeolite channels of the sorbent. Over the temperature range of 20 to 90A degrees C, the kinetics of leaching at the initial stage is limited by diffusion in the liquid phase, becoming of dispersion character at late stages. The activity of A-terskite in the process of ion exchange with Cs+ increases with the degree of leaching.
引用
收藏
页码：284 / 289
页数：6
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