New method of treating dilute mineral acids using magnesium–aluminum oxide

Kameda, Tomohito; Yabuuchi, Fumiko; Yoshioka, Toshiaki; Uchida, Miho; Okuwaki, Akitsugu

doi:10.1016/s0043-1354(02)00374-3

Cited by 71 publications

(29 citation statements)

References 20 publications

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“…Mg-Al LDH can intercalate various types of inorganic anions, such as AsO 4 3À , Cl À , NO 3 À , F À , SO 4 2À , CO 3 2À , BO 3 3À and HPO 4 2À in its interlayers. [4][5][6][7][8][9][10][11][12][13] Similarly, the intercalation of organic anions, such as phenols, anionic surfactants and coloured organics, in the interlayer of Mg-Al LDH has been investigated from various viewpoints. [14][15][16][17][18] The organic-inorganic composites produced by intercalation of organic acid anions in the interlayer of Mg-Al LDH are expected to perform various functions due to the functional groups of the organic acid anions.…”

Section: Mg-al Layered Double Hydroxide (Mg-al Ldh: [Mgmentioning

confidence: 99%

Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

2006

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A Mg-Al layered double hydroxide (Mg-Al LDH) has been modified with aromatic anions by a coprecipitation technique. This method is based on the anion-exchange characteristics of the hydrotalcite-type compound which intercalates various anions, including anions of organic acids, in the interlayer. The Mg-Al LDHs are intercalated with 2-naphthalene sulphonate (2-NS À ) and 2,6-naphthalene disulphonate (2,6-NDS 2À ) ions, which contain a naphthalene ring with one and two sulphonate (-SO 3 À ) groups in their structures, respectively. They are formed by the dropwise addition of a mixed aqueous solution of Mg(NO 3 ) 2 and Al(NO 3 ) 3 (Al/Mg mole ratio = 1/3) to a solution containing the individual organic anion at a constant pH of 10.0. The Mg-Al LDHs modified with aromatic anion are expected to recognize and selectively uptake hazardous aromatic compounds, such as bisphenol A, from aqueous solutions. The composite materials prepared were characterized by X-ray diffraction, FT-IR spectroscopy and chemical analyses.2-NS À was observed to be intercalated into the interlayer almost fully up to the accommodation expected based on the neutralisation of the positive charge of the host lattice. The intercalation of 2,6-NDS 2À was approximately 80% of the expected value, however. IR analysis results show that the organic anions are intercalated into the Mg-Al LDH without any significant change in their intrinsic structure.The X-ray diffraction data suggest that the intercalation of the organic anions under consideration was accompanied by an expansion in the basal spacing of the LDHs. The X-ray diffraction patterns of the 2-NS À -modified LDH suggested the formation of two types of LDHs showing different basal spacing at higher 2-NS À content. On the other hand, the 2,6-NDS À -modified LDH showed diffraction peaks, which corresponded to the basal spacing, with widely spreading peak angles and reduced intensity, suggesting the widely varying basal spacing of the Mg-Al LDH.

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Section: Mg-al Layered Double Hydroxide (Mg-al Ldh: [Mgmentioning

confidence: 99%

Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

2006

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“…Based on this behavior, Mg-Al oxide could both neutralize and fix Cl -in the treatment of HCl (Kameda et al 2000(Kameda et al , 2002(Kameda et al , 2005(Kameda et al , 2006. Mg-Al oxide was also shown to treat mineral acids such as H 3 PO 4 , H 2 SO 4 , and HNO 3 (Kameda et al 2003).…”

Section: Introductionmentioning

confidence: 94%

Simultaneous removal of Cl− and SO4 2− from seawater using Mg−Al oxide: kinetics and equilibrium studies

2014

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“…Par ailleurs, la capacité de fixation du matériau calciné HT-C (2,4 mmol g -1 ) est supérieure à celle du matériau de départ HT. Ce qui suggère, en accord avec plusieurs observations antérieures pour la sorption des ions chromate et d'autres anions (GOSWAMEE et al, 1998;KAMEDA et al, 2003;LAZARIDIS et ASOUHIDOU, 2003), qu'en plus du processus d'adsorption sur la surface externe, il y a également un processus d'intercalation d'anions, lors de la reconstruction du domaine interlamellaire. Enfin, la différence entre la quantité retenue de Cr(VI) sur le solide HT-C et sa capacité d'échange anionique pourrait être attribuée à l'effet compétitif des ions carbonate, étant donné que l'opération est effectuée à l'air libre.…”

Section: Sorption Des Ions Chromateunclassified

Étude des facteurs contrôlant la sorption de Cr(VI) sur une hydrotalcite de synthèse

Bakhti

Ouali

2007

rseau

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La sorption des ions chromate de solutions aqueuses sur une hydrotalcite de synthèse et sur son produit de calcination a été étudiée. L’interaction de ces matériaux avec les ions chromate montre que la cinétique de sorption est rapide et suit une expression de vitesse de sorption réversible du premier ordre. Les influences du pH, de la concentration en ions chromate de la solution et de la température ont été étudiées afin d’optimiser la sorption. Le traitement de solutions contenant de 10 à 200 mg L-1 de Cr(VI) a donné de bons résultats. Les capacités de sorption de ces matériaux sont 1,3 et 2,4 mmol g‑1 de Cr(VI), respectivement. L’étude de la réversibilité de la sorption des ions chromate indique qu’il est possible d’utiliser les hydrotalcites calcinées comme sorbants recyclables. Ceci suggère notamment que ces derniers pourraient constituer d’intéressants supports pour le piégeage d’ions chromate.The sorption of chromate ions from aqueous solutions onto a synthetic hydrotalcite and its calcination product was investigated. The interaction of these materials with chromate ions shows that the kinetics of sorption are fast and follow a first-order reversible model. The effects of pH, chromate ion concentration and temperature on the sorption were studied. Solutions containing from 10 to 200 mg L‑1 of Cr(VI) were successfully treated. The sorption capacities of these materials are approximately 1.3 and 2.4 mmol CrO42-, per g, for the hydrotalcite and its calcination product, respectively. The reversibility of the sorption of chromate ions suggests the possible use of the calcined hydrotalcites as recyclable sorbents, which may constitute useful supports for trapping chromate ions

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New method of treating dilute mineral acids using magnesium–aluminum oxide

Cited by 71 publications

References 20 publications

Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

Simultaneous removal of Cl− and SO4 2− from seawater using Mg−Al oxide: kinetics and equilibrium studies

Étude des facteurs contrôlant la sorption de Cr(VI) sur une hydrotalcite de synthèse

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New method of treating dilute mineral acids using magnesium–aluminum oxide

Cited by 71 publications

References 20 publications

Preparation and Characterisation of Mg&ndash;Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

Preparation and Characterisation of Mg&ndash;Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

Simultaneous removal of Cl− and SO4 2− from seawater using Mg−Al oxide: kinetics and equilibrium studies

Étude des facteurs contrôlant la sorption de Cr(VI) sur une hydrotalcite de synthèse

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Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate