Intercalation behavior of l-ascorbic acid into layered double hydroxides

Aisawa, Sumio; Higashiyama, Norihito; Takahashi, Satoshi; Hirahara, Hidetoshi; Ikematsu, Daisaku; Kondo, Hajime; Nakayama, Hirokazu; Narita, Eiichi

doi:10.1016/j.clay.2006.09.003

Cited by 74 publications

(46 citation statements)

References 25 publications

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“…At this composition, the compound does not exhibit any anion-exchange properties as the nitrate ions intercalated in layered hydroxides of low layer charge are not labile. This explains the paucity of information on anion-exchange reactions of layered double hydroxides of Mg and Fe.at best equivocal and there are some definitive reports, [4] including this work, of the absence of anion-exchange reactions in Fe-containing LDHs.(2) In general, the a parameter of LDHs decreases with increasing trivalent metal content.[ (3) If the composition is fixed at x = 0.25, as suggested by some authors, [17] or at x = 0.2, as suggested by others, [5,18] does the Mg/Fe LDH crystallize in a cation-ordered structure? [17] The answers to these questions have not been forthcoming on account of the absence of precise structural information on Mg/Fe LDHs.…”

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Structure and Composition of the Layered Double Hydroxides of Mg and Fe: Implications for Anion‐Exchange Reactions

2011

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Partial cation exchange of Mg 2+ ions with Fe 3+ ions employing solid Mg(OH) 2 as precursor yielded an ordered layered double hydroxide of Mg and Fe in the presence of carbonate anions. Structure refinement revealed that the compound adopts the polytype structure 3R 1 (space group R3m, a = 3.108 Å, c = 23.08 Å) and does not show any signs of cation order. It crystallizes with a unique cation ratio of [Mg]/ [Fe] = 4. At this ratio, the compound shows a single sharp absorption in its electronic spectrum at 280 nm. Attempts to prepare the LDH with a higher Fe content resulted in the IntroductionThe layered double hydroxide (LDH) of Mg and Fe has potential applications in catalysis, [1] water purification, [2,3] safe storage of vitamins, [4] anion exchange, [5] as well as cation sorption.[6] The oxide residue obtained by the thermal decomposition of the Mg/Fe LDH is a bifunctional catalyst with both acidic and basic surface sites.[7] The Fe 0 /Fe 2+ / Fe 3+ composition of the catalyst can be finely tuned by controlled reduction, whereby catalysts with high olefin selectivity can be generated for use in the Fischer-Tropsch reaction. Given the magnetic properties of the oxides of Fe III , the Mg/Fe LDH is also used as a precursor for the synthesis of single-phase magnetic ferrites [8] and magnetic nanocomposites.[9] Furthermore, the Mg/Fe LDH is less toxic than many combinations of di-and trivalent cations and is proposed as a model medium for drug delivery. [10] The Mg/Fe LDH is obtained by the isomorphous substitution of a fraction x of Mg 2+ ions by Fe 3+ ions in Mg-(OH) 2 to yield positively charged layers with the composi-x+ . [11] Anions are incorporated into the interlayer. Many pairs of di-and trivalent cations can be combined with a variety of anions [12][13][14] to obtain a large and diverse family of layered double hydroxides. The Mg/ Fe LDH in many ways stands apart from other LDHs.(1) There is limited literature on the anion-exchange and -uptake properties of the pristine and calcined Mg/Fe LDH. Evidence for the anion-exchange of Mg/Fe LDHs is phase separation of excess Fe into X-ray amorphous binary compounds, the existence of which can be discerned only by the appearance of absorptions at λ Ͼ 350 nm, a characteristic of oxide-hydroxides of Fe 3+ . The nitrate-containing compound also forms with a similarly low Fe content. At this composition, the compound does not exhibit any anion-exchange properties as the nitrate ions intercalated in layered hydroxides of low layer charge are not labile. This explains the paucity of information on anion-exchange reactions of layered double hydroxides of Mg and Fe.at best equivocal and there are some definitive reports, [4] including this work, of the absence of anion-exchange reactions in Fe-containing LDHs.(2) In general, the a parameter of LDHs decreases with increasing trivalent metal content.[ (3) If the composition is fixed at x = 0.25, as suggested by some authors, [17] or at x = 0.2, as suggested by others, [5,18] does the Mg/Fe LDH crystallize in a cation-ord...

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confidence: 83%

“…The layered double hydroxide (LDH) of Mg and Fe has potential applications in catalysis, [1] water purification, [2,3] safe storage of vitamins, [4] anion exchange, [5] as well as cation sorption.…”

Section: Introductionmentioning

confidence: 99%

Structure and Composition of the Layered Double Hydroxides of Mg and Fe: Implications for Anion‐Exchange Reactions

2011

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“…In addition, the amount of the incorporated drug into LDH has been controlled by changing the composite preparation technique (17). The intercalation of vitamins (18) and nucleic acids (19) into LDH offered a safe preservation of the guest bioactivity without any deterioration of the structural integrity. In addition, LDH has anti-acid and anti-pepsin properties (20) that can serve in the decrease of gastrointestinal irritation resulting from oral administration of drugs containing carboxylic acid groups.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite Formulation System of Lipid-Regulating Drugs Based on Layered Double Hydroxide: Synthesis, Characterization and Drug Release Properties

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“…In contrast, the basal spacing of 0.7 M MAC was slightly shifted downward to 9.3 Å with the wider basal spacing after the intercalation process took place. The increases in the basal spacing of nanocomposite showed the expansion of the interlayers of the MAN host due to the inclusion of a new guest anion, 4-CPA [13][14]. Thus, this intercalation was assumed to be success since there was an absence of nitrate peak ion in the XRD pattern of 0.7 M MAC.…”

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confidence: 99%

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2017

JESR

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Layered double hydroxide (LDH)-based nanocomposite, created by interacting LDH with another nanoparticles usually applied in the area of environmental, catalytic, industrial and biomedical field. In this study, a new herbicide delivery system was developed through the intercalation of Magnesium Aluminiumlayered double hydroxide (MAN host) with 4-chlorophenoxyacetic acid (4-CPA). This intercalation was done by using co-precipitation method at pH 10 with different concentration of 4-CPA which were 0.5 M and 0.7 M. The successful intercalation was obtained at 0.7 M Magnesium Aluminium-4-chlorophenoxyacetic acid (MAC) and had been confirmed through several analysis. Firstly, the XRD pattern shows expansion of basal spacing shifted from 8.9 Å to 9.3 Å. This result supported by the FTIR-ATR spectrum that shows the disappearance nitrate peak (NO 3 -) and appearance of carboxylate ion (COO -) peak at 1596 cm -1 . Furthermore, this intercalation was validated with the result of surface morphology by FESEM. The controlled release study of 4-CPA from 0.7 M MAC shown sodium carbonate solution released the percentage of 4-CPA higher than tap water. This study has signifies MAC as a safer agent of agrochemicals by reducing the dosage of herbicide in the agriculture field and protect the herbicide through encapsulation system.

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Intercalation behavior of l-ascorbic acid into layered double hydroxides

Cited by 74 publications

References 25 publications

Structure and Composition of the Layered Double Hydroxides of Mg and Fe: Implications for Anion‐Exchange Reactions

Structure and Composition of the Layered Double Hydroxides of Mg and Fe: Implications for Anion‐Exchange Reactions

Nanocomposite Formulation System of Lipid-Regulating Drugs Based on Layered Double Hydroxide: Synthesis, Characterization and Drug Release Properties

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