Method for exchanging interlayer anions of a layered double hydroxide
AssigneesParis Sciences Et Lettres—Quartier Latin, Centre National de la Recherche Scientifique (CNRS)
InventorGrégory Lefevre
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Abstract
The invention relates to a method for exchanging interlayer anions of a layered double hydroxide (LDH) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions, which comprises the successive steps of: (1) exchanging the starting interlayer anions of a layered double hydroxide with polyoxometalate anions in order to obtain a layered double hydroxide with polyoxometalate anions as interlayer anions, and (2) exchanging the polyoxometalate anions of the layered double hydroxide obtained in step (1) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions in order to obtain a layered double hydroxide with other anions as interlayer anions.
Claims20
A method for exchanging starting interlayer anions of a layered double hydroxide (LDH) with other anions whose affinity for the LDH is lower than for the starting interlayer anions of the LDH, which comprises the successive steps of:
- (1) exchanging the starting interlayer anions of the layered double hydroxide with polyoxometalate anions in order to obtain a layered double hydroxide with polyoxometalate anions as interlayer anions, and
- (2) exchanging the polyoxometalate anions of the layered double hydroxide obtained in step (1) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions in order to obtain a layered double hydroxide with other anions as interlayer anions.
A method for extracting anions contained in a solution, which comprises the steps of:
- (1) exchanging starting interlayer anions of a layered double hydroxide with polyoxometalate anions in order to obtain a layered double hydroxide (LDH) with polyoxometalate anions as interlayer anions,
- wherein the affinity for the LDH of the anions to be extracted is lower than for the starting interlayer anions,
- (2) placing the layered double hydroxide obtained in step (1) in the solution containing the anions to be extracted, and
- (3) extracting the anions contained in said solution by exchanging the polyoxometalate anions of the layered double hydroxide with the anions to be extracted.
Dependencies are inferred from the claim text.