Anion exchange in Zn-Al layered double hydroxides: In situ X-ray diffraction study

被引：58
|
作者：
Salak, Andrei N. [1 ]
Tedim, Joao [1 ]
Kuznetsova, Alena I. [1 ]
Zheludkevich, Mikhail L. [1 ]
Ferreira, Mario G. S. [1 ]
机构：
[1] Univ Aveiro, Dept Ceram & Glass Engn CICECO, P-3810193 Aveiro, Portugal
来源：
CHEMICAL PHYSICS LETTERS | 2010年 / 495卷 / 1-3期
关键词：
D O I：
10.1016/j.cplett.2010.06.041
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：
Anion exchange capacity is a key factor for the application of Zn-Al layered double hydroxides (LDHs) as nano-containers in active corrosion protection. In this work, the nitrate-pyrovanadate anion exchange/re-exchange processes in these LDHs were investigated in situ. We demonstrate that the exchange reactions lead to a decrease of the average crystallite size of LDHs as a result of mechanical fragmentation of the crystallites rather than dissolution/recrystallization. The fragmentation occurs due to fast anion exchange in the initial stage, and can be controlled by changing the ratio of the available substituent anions to the replacement anions and application of a mechanical activation. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：73 / 76
页数：4
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