Adsorption of Cr(VI) by layered double hydroxides
IR@NEIST: CSIR-North East Institute of Science and Technology, Jorhat
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| Title |
Adsorption of Cr(VI) by layered double hydroxides
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| Creator |
GOSWAMI , R L
SENGUPTA , P BHATTACHARYYA , K G DUTTA , D K |
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| Subject |
Material Science
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| Description |
Adsorption of Cr�VI. by various uncalcined and calcined layered double hydroxides �LDH. of
Mg 13Al, Ni 13Al and Zn 13Cr types was investigated. Adsorption of Cr2O72y through ion exchange
in uncalcined LDH is slower in rate and smaller in amount than in calcined one where the
adsorption occurs via rehydration. The nature and content of bi- and trivalent metal ions in LDH
influence the adsorption. Calcined Mg 13Al LDH with higher Al3q content in the precursor
structure shows higher adsorption capacity. Adsorption is higher in the Mg 13Al LDH than in
Ni 13Al and Zn 13Cr LDH. A two-step first-order rate kinetics was observed for the adsorption
process which follows the Freundlich-type adsorption isotherm. The explanation of adsorption
phenomenon has been supported by X-ray diffraction patterns. The pH of initial Cr2O72y solution
has no affect on adsorption by calcined LDH. Release of Cr2O72y from the adsorbed product
depends upon the type of anion in the aqueous phase and CO32y being the most effective ion.
Calcination of the Cr2O72y adsorbed product up to 12508C has not resulted in the formation of
Cr-immobilized phases
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| Date |
1999
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://neist.csircentral.net/377/1/700_APPL_C.S1998.pdf
GOSWAMI , R L and SENGUPTA , P and BHATTACHARYYA , K G and DUTTA , D K (1999) Adsorption of Cr(VI) by layered double hydroxides. Applied Clay Science, 13 (1). pp. 21-34. |
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| Relation |
http://neist.csircentral.net/377/
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