Kinetics of hydrogen-sodium ion exchange in acid zirconium phosphate

被引：17

作者：

Kotov, VY

Stenina, IA

Yaroslavtsev, AB

机构：

[1] Russian Acad Sci, NS Kurnakov Gen & Inorgan Chem Inst, Moscow 117907, Russia

[2] Russian Acad Sci, Higher Chem Coll, Moscow 125047, Russia

来源：

SOLID STATE IONICS | 1999年 / 125卷 / 1-4期

关键词：

cation mobility; ion exchange; acid phosphate; double phosphates; diffusion;

D O I：

10.1016/S0167-2738(99)00158-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Proton diffusion in NaHZr(PO4)(2)-5H(2)O and Na2Zr(PO4)(2)-3H(2)O phases was examined by studying the kinetics of hydrogen-sodium ion exchange. Three regions characterized by an almost linear dependence of the apparent diffusion coefficients of the hydrogen ion on the pH values were obtained at pH < 7, 7 < pH < 9 and 9 < pH < 11. The phenomenon was explained by different mechanisms of defect formation in the pH ranges investigated. The distribution of the proton defect concentration in the grains was estimated for different pH values, The influence of the anion nature in the contacting solutions on the diffusion coefficients was also discussed. The rate of ion exchange increases in the series: I- < Br- < Cl-, ClO4- <NO3- <SO42-. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：55 / 60

页数：6

共 7 条

[1] SYNTHESES, CRYSTALLINE-STRUCTURE, AND ION-EXCHANGE PROPERTIES OF INSOLUBLE ACID SALTS OF TETRAVALENT METALS AND THEIR SALT FORMS [J].