Abstract
The layered double hydroxide (LDH) of Zn with Cr on treatment with a hypochlorite solution releases chromate ions as a result of oxidative leaching by a dissolution-reprecipitation mechanism. The residue is found to be ε-Zn(OH)2. The LDH of Mg with Cr on the other hand is resistant to oxidative leaching. In contrast, a X-ray amorphous gel of the coprecipitated hydroxides of Mg and Cr yields chromate ions. These results suggest that the oxidation potential of Cr(III) in LDHs is determined by the nature of the divalent ion and the crystallinity of the phase while being unaffected by the nature of the intercalated anions.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Boclair J W and Braterman P S 1998Chem. Mater. 10 2050
Boehm H P, Steinle J and Vieweger C 1977Angew. Chem. Int. Ed. Engl. 16 265
Cavani F, Trifiro F and Vaccari A 1991Catalysis Today 11 173
del Arco M, Galiano M V G, Rives V, Trujillano R and Malet P 1996Inorg. Chem. 35 6362
Gallezot P and Prettre M 1969Bull. Chim. Soc. (France) 407
Grosso R P, Suib S L, Weber R S and Schubert P F 1992Chem. Mater. 4 922
Jayashree R S and Kamath P V 2002J. Power Sources 107 120
Kamath P V, Dixit M, Indira L, Shukla A K, Kumar V G and Munichandraiah N 1994J. Electrochem. Soc. 141 2956
Kamath P V, Therese G H A and Gopalakrishnan J 1997J. Solid State Chem. 128 38
Komarneni S, Kozai N and Roy R 1998J. Mater. Chem. 8 1329
Kooli F, Rives V and Ulibarri M A 1995Inorg. Chem. 34 5122
Miyata S 1980Clays Clay Minerals 28 50
Miyata S 1983Clays Clay Minerals 31 305
Oliva P, Leonardi J, Laurent J F, Delmas C, Braconnier J J, Figlarz M, Fievet F and de Guibert A 1982J. Power Sources 8 229
Oswald H R and Asper R 1977Preparation and crystal growth of materials with layered structures (ed.) R M A Lieth (Dordrecht: D. Reidel Publishing Company)1 p. 71
Rajamathi M, Thomas G S and Kamath P V 2001Proc. Indian Acad. Sci. (Chem. Sci.) 113 671
Shannon R D 1976Acta Crystallogr.A32 751
Taylor H F W 1973Miner. Mag. 39 377
Vogel’s Text book of quantitative inorganic analysis including elementary instrumental analysis 1978 (eds) J Bassett, R C Denney, G H Jeffery and J Mendham (plLondon: The English Language Book Society and Longman) 4th ed.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Radha, A.V., Kamath, P.V. Oxidative leaching of chromium from layered double hydroxides: Mechanistic studies. Bull Mater Sci 27, 355–360 (2004). https://doi.org/10.1007/BF02704772
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02704772