Anion-Exchange Reactions of Layered Double Hydroxides: Interplay between Coulombic and H-Bonding Interactions
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- 作者：S. V. Prasanna ; P. Vishnu Kamath
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2009
- 出版时间：July 1, 2009
- 年：2009
- 卷：48
- 期：13
- 页码：6315-6320
- 全文大小：122K
- 年卷期：v.48,no.13(July 1, 2009)
- ISSN：1520-5045
文摘
The NO3p>− p>- and Clp>− p>-containing layered double hydroxides (LDHs) of Mg with Al interact weakly with anions in solution under equilibrated conditions and yield a type V isotherm. The uptake of anions under nonequilibrated conditions varies monotonically with the layer charge when the outgoing anion is NO3p>− p>, whereas it goes through a maximum when the outgoing anion is Clp>− p>. These observations suggest that Coulombic interactions play a dominant role in Clp>− p>-LDHs, whereas weak interactions governing the mode of intercalation of NO3p>− p> ions influence the exchange reactions of NO3p>− p>-LDHs. These studies have significant implications for the remediation of insidious anions by LDHs.