NickelMaghrebV1, Maroc, Analysis, bibRecord, 000235

New Varieties of Zinc–Chromium–Sulfate Lamellar Double Hydroxides

Identifieur interne : 000235 ( Maroc/Analysis ); précédent : 000234; suivant : 000236

New Varieties of Zinc–Chromium–Sulfate Lamellar Double Hydroxides

Auteurs : M. Khaldi [Maroc] ; A. De Roy [France] ; M. Chaouch [Maroc] ; J. P. Besse [France]

Source :

Journal of Solid State Chemistry [ 0022-4596 ] ; 1997.

RBID : ISTEX:FFFD0F4D7569E301906888EFC0EC9C5F488C9E91

Abstract

The synthesis of zinc–chromium lamellar double hydroxides (LDHs) intercalated by sulfate anions is carried out with a one-step method that combines coprecipitation and anionic exchange. The materials obtained in a reactor containing a sodium sulfate solution are compared with those prepared from lithium, potassium, and ammonium sulfate solutions. The compounds are characterized by chemical analysis, powder X-ray diffraction, and infra-red spectroscopy. Depending on pH conditions, the washing process, and the nature of the monovalent cation, the sulfate intercalated compounds exhibit two 2H hexagonal varieties with different layer spacingsd≈8.9 Å andd≈11 Å at room temperature; this last phase is related to the insertion of alkaline interlamellar cations. Under dry air, the loss of intercalated water leads to a 3R rhombohedral variety withd≈8.2 Å. A second rhombohedral variety withd≈10.9 Å is reversibly obtained from the “8.9 Å” phase under high relative humidity. These four [Zn–Cr–SO4] LDHs differ by their stacking sequences and interlamellar distances and can be selectively obtained.

Url:

https://api.istex.fr/document/FFFD0F4D7569E301906888EFC0EC9C5F488C9E91/fulltext/pdf

DOI: 10.1006/jssc.1997.7280

Affiliations:

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ISTEX:FFFD0F4D7569E301906888EFC0EC9C5F488C9E91

Le document en format XML

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<front><div type="abstract" xml:lang="en">The synthesis of zinc–chromium lamellar double hydroxides (LDHs) intercalated by sulfate anions is carried out with a one-step method that combines coprecipitation and anionic exchange. The materials obtained in a reactor containing a sodium sulfate solution are compared with those prepared from lithium, potassium, and ammonium sulfate solutions. The compounds are characterized by chemical analysis, powder X-ray diffraction, and infra-red spectroscopy. Depending on pH conditions, the washing process, and the nature of the monovalent cation, the sulfate intercalated compounds exhibit two 2H hexagonal varieties with different layer spacingsd≈8.9 Å andd≈11 Å at room temperature; this last phase is related to the insertion of alkaline interlamellar cations. Under dry air, the loss of intercalated water leads to a 3R rhombohedral variety withd≈8.2 Å. A second rhombohedral variety withd≈10.9 Å is reversibly obtained from the “8.9 Å” phase under high relative humidity. These four [Zn–Cr–SO4] LDHs differ by their stacking sequences and interlamellar distances and can be selectively obtained.</div>
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New Varieties of Zinc–Chromium–Sulfate Lamellar Double Hydroxides

New Varieties of Zinc–Chromium–Sulfate Lamellar Double Hydroxides

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Abstract

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