Mechanism of the anion exchange reactions of the layered double hydroxides (LDHs) of Ca and Mg with Al

被引：144
|
作者：
Radha, AV
Kamath, PV
Shivakumara, C [1 ]
机构：
[1] Bangalore Univ, Cent Coll, Dept Chem, Bangalore 560001, Karnataka, India
[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
来源：
SOLID STATE SCIENCES | 2005年 / 7卷 / 10期
关键词：
layered double hydroxide; hydrocalumite; hydrotalcite; dissolution-reprecipitation; anion exchange;
D O I：
10.1016/j.solidstatesciences.2005.05.004
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The nitrate containing layered double hydroxide (LDH) of Ca with Al on reaction with aqueous solutions of Na2CO3 and Na3PO4 yields CaCO3 and Ca-5(PO4)(3)OH respectively rather than the carbonate/phosphate containing LDHs. The LDH of Mg with Al on reacting with dissolved phosphate ions also leads to the formation of unitary phosphates. This shows that the anion exchange reactions of layered double hydroxides take place by the dissolution-reprecipitation mechanism rather than by the topotactic mechanism. (c) 2005 Elsevier SAS. All rights reserved.
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页码：1180 / 1187
页数：8
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