Intercalation of dicarboxylate anions into a Zn–Al–Cl layered double hydroxide: microcalorimetric determination of the enthalpies of anion exchange

Morel‐Desrosiers, Nicole; Pisson, Julien; Israëli, Yaël; Taviot-Guého, Christine; Besse, J.P.; Morel, Jean‐Pierre

doi:10.1039/b303953f

Cited by 69 publications

(41 citation statements)

References 32 publications

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“…Therefore, the M 2+ /M 3+ mole ratio in hydrotalcite is very important for removal of As(III) from aqueous solution. [28][29][30][31] The objective of the present study is to evaluate the capability of a novel Fe-Mg hydrotalcite (Fe-HT) for As(III) adsorption from aqueous solution. The properties of the Fe-HT, adsorption kinetics, adsorption isotherms, and effect of temperature are investigated.…”

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confidence: 99%

Adsorption of As(III) from Aqueous Solutions by Novel Fe–Mg Type Hydrotalcite

Ogata

Kawasaki

2015

CHEMICAL & PHARMACEUTICAL BULLETIN

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Morphological and chemical evaluation of Fe-Mg hydrotalcite (Fe-HT) was performed using scanning electron microscopy, X-ray diffraction analysis, and electron microanalysis for application as an adsorbent for water treatment. The adsorption of arsenic III (As(III)) on Fe-HT was evaluated via examination of the effect of the contact time and analysis of the adsorption isotherm. The amount of As(III) adsorbed increased slightly with increasing temperature. The results of the adsorption isotherm studies suggested that As(III) adsorption can be well described by both the Freundlich and Langmuir equations. The adsorption of As(III) on Fe-HT reached equilibrium within 24 h, and the adsorption kinetic data fit the pseudo-second-order kinetic model better than the pseudo-first-order model. The amount of As(III) present on the surface of Fe-HT increased after As(III) adsorption, and the crystalline structure of Fe-HT was maintained after adsorption of As(III). The (003) and (006) peaks in the X-ray diffraction patterns were attributed to basal reflections, and these peaks shifted from respective 2θ values of 10.86 and 21.94° to 11.12 and 22.52°, indicating exchange of As(III) with chloride ions in Fe-HT with consequent narrowing of the inter-layer spacing. Collectively, these results suggest that Fe-HT is prospectively useful for the adsorption of As(III) from aqueous solutions. Key words Fe-Mg hydrotalcite; arsenic(III); adsorptionHeavy metals are potentially hazardous to human health and aquatic flora and fauna at concentrations exceeding the allowable limits. At concentrations below these limits, long-term heavy metal contamination is still possible because heavy metals are known to accumulate within biological systems. 1)Arsenic (As) is one of the most toxic metal ions and poses a serious health risk in many countries of the world, being associated with increased risk of skin, lung, and kidney cancer.2,3) The presence of As in groundwater in different parts of the world has recently been extensively reported, including countries in North America and Latin America, Australia, and South Asia. [4][5][6][7][8][9][10] Therefore, the Environmental Protection Agency (EPA) lowered the maximum concentration level of arsenic in water systems from 50 to 10 µg/L. In addition, As(III) is more toxic and difficult to treat than As(V) species. As(III) and As(V) are highly toxic agents that exert mutagenic effects on living organisms.11-13) Compliance with this strict As standard in drinking water requires the development of inexpensive and effective technologies for better removal of As.Among these methods, the adsorption technique is gaining popularity due to its simplicity, potential for regeneration, and sludge-free operation.14) Furthermore, the potential of adsorption as an attractive technology can be further enhanced if the adsorbent can be made cheaply and ready for use. Many kinds of adsorbents such as modified red mud, aluminum compounds, and synthetic goethite have been developed for the removal arsenic. [15][16][17][18] ...

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confidence: 99%

Adsorption of As(III) from Aqueous Solutions by Novel Fe–Mg Type Hydrotalcite

Ogata

Kawasaki

2015

CHEMICAL & PHARMACEUTICAL BULLETIN

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“…43 This method is especially useful when the co-precipitation method is inapplicable, for example, the divalent or trivalent metal cations or the anions involved are unstable in alkaline solution, or the direct reaction between metal ions and guest anions is more favourable, or there is no suitable soluble salt of the guest anions. In thermodynamic terms, anion exchange in LDHs depends mainly on the electrostatic interactions between the host sheets and the exchanging anions and, to a lesser extent, on the free energy associated with the changes of hydration.…”

Section: Anion-exchange Methodsmentioning

confidence: 99%

“…In thermodynamic terms, anion exchange in LDHs depends mainly on the electrostatic interactions between the host sheets and the exchanging anions and, to a lesser extent, on the free energy associated with the changes of hydration. 43,44 Another important remark is that the equilibrium constant increases when the ionic radius of the bare anion decreases. Exchange is therefore favoured for in-going anions with a high charge density.…”

Section: Anion-exchange Methodsmentioning

confidence: 99%

Functional Materials - Syntheses, Characterisation and Catalytic Applications

Sipiczki¹

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“…As it was described for coprecipitation, various, even large organic anions can be introduced among the layers of the LDHs. On using the direct anion exchange, the goal is to introduce the chosen anion between the layers of an already formed LDH, exploiting the exchange properties of the interlayer anions [55] . This intercalation method is useful when the co-precipitation method is inapplicable, like when one of the metal cations, or the anion is unstable under alkaline conditions, or the direct reaction between metal ions and guest anions is more favorable, or the desired guest anion could not be prepared as a metal salt.…”

Section: Direct Anion-exchange Methodsmentioning

confidence: 99%

Mechanochemical Preparation and Structural Characterization of Layered Double Hydroxides and their Amino Acid-Intercalated Derivatives

Ferencz¹

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Intercalation of dicarboxylate anions into a Zn–Al–Cl layered double hydroxide: microcalorimetric determination of the enthalpies of anion exchange

Cited by 69 publications

References 32 publications

Adsorption of As(III) from Aqueous Solutions by Novel Fe–Mg Type Hydrotalcite

Adsorption of As(III) from Aqueous Solutions by Novel Fe–Mg Type Hydrotalcite

Functional Materials - Syntheses, Characterisation and Catalytic Applications

Mechanochemical Preparation and Structural Characterization of Layered Double Hydroxides and their Amino Acid-Intercalated Derivatives

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