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Issue 42, 2006
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Selective intercalation of chlorophenoxyacetates into the layered double hydroxide [LiAl2(OH)6]Cl·xH2O

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Abstract

Chlorophenoxyacetic acids are a well known family of herbicides. 4-Chlorophenoxyacetate (4-CPA), 2,4-dichlorophenoxyacetic (2,4-D), 2,4,5-trichlorophenoxyacetate, (2,4,5-T) have been intercalated into [LiAl2(OH)6]Cl·xH2O LDH ([Li–Al–Cl] LDH) by ion-exchange. The kinetics and mechanisms involved in the intercalation of each chlorophenoxyacetate have been studied by time-resolved in-situ energy dispersive X-ray powder diffraction (EDXRD). The kinetic preferential order of the intercalation of these herbicides into [Li–Al–Cl] LDH is found to be 4-CPA > 2,4-D > 2,4,5-T. In contrast, thermodynamic guest preference, as determined by performing competitive intercalation reactions is 2,4-D > 4-CPA > 2,4,5-T. The results indicate chlorophenoxyacetate-LDH compounds could have application for the purification, storage and release of chlorophenoxyacetic acid–based agrochemicals.

Graphical abstract: Selective intercalation of chlorophenoxyacetates into the layered double hydroxide [LiAl2(OH)6]Cl·xH2O

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Publication details

The article was received on 26 Jul 2006, accepted on 22 Aug 2006 and first published on 06 Sep 2006


Article type: Paper
DOI: 10.1039/B610766D
Citation: J. Mater. Chem., 2006,16, 4155-4159
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    Selective intercalation of chlorophenoxyacetates into the layered double hydroxide [LiAl2(OH)6]Cl·xH2O

    A. Ragavan, A. Khan and D. O'Hare, J. Mater. Chem., 2006, 16, 4155
    DOI: 10.1039/B610766D

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