Thermal decomposition and structural reconstruction effect on Mg–Fe-based hydrotalcite compounds

Ferreira, Odair P.; Alves, Oswaldo Luiz; Gouveia, D. X.; Filho, A. G. Souza; Paiva, J. A. C. De; Fílho, J. Mendes

doi:10.1016/j.jssc.2004.04.030

Cited by 149 publications

(82 citation statements)

References 34 publications

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“…Some thermally decomposed LDHs will undergo spontaneous rehydration and structural reconstruction, called "Memory Effect", when added to an aqueous medium [28]. Anion incorporation occurs simultaneously in this process, increasing the anionic exchange capacity of this compound [29].…”

Section: Calcinationmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

207

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a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

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Section: Calcinationmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

207

View full text Add to dashboard Cite

show abstract

“…This is expected since the iron centres are surrounded by Fe 3+ and M(II) at random, and these randomly distributed neighbouring octahedra exert perturbations on the Fe 3+ centres with varying intensities. 23 The 57 Fe Mössbauer parameters reflect high-spin Fe(III) microenvironments for all cases. 57 Fe Mössbauer measurements were repeated on a series of freshly prepared samples cooled immediately to 78 K after their preparation to avoid structural changes due to the possible reaction with aerial CO 2 .…”

Section: Scherrer Equationmentioning

confidence: 91%

“…Relatively few articles describe the structures of the layers in ironcontaining layered double hydroxides. 22,23,24,25 It is surprising, since Fe(III)-based layered double hydroxides can be prosperous, especially if used in catalysis. In aqueous media the iron(III) ion is water-soluble in a much narrower pH range than aluminium(III) ions.…”

Section: Iron-based Layered Double Hydroxidesmentioning

confidence: 99%

“…31 It is clear from these few examples that 57 Fe Mössbauer spectroscopy has been used to study the structure of layers at a scarce, but it is not entirely unprecedented. 23,24,25,32 …”

Section: Iron-based Layered Double Hydroxidesmentioning

confidence: 99%

“…23 The DTG curve for Mg n Fe sample is shown in Figure 16. Two endothermic peaks located between 100 and 170 °C and at 320 °C are observed.…”

Section: Figure 15 X-ray Absorption Spectra Of the Ca 3 Fe-ldh Samplmentioning

confidence: 99%

See 2 more Smart Citations

Functional Materials - Syntheses, Characterisation and Catalytic Applications

Sipiczki¹

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Nano/Microporous Materials: Nanostructured Layered Double Hydroxides

Leroux¹,

Pr��vot²

2005

Encyclopedia of Inorganic Chemistry

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This review summarizes developments in nanostructured layered double hydroxide (LDH) materials for the period 2004–2007. Particular attention is paid to synthesis aspects, including coprecipitation, urea decomposition, sol‐gel processing and derivative methods as well as the generation of functional materials through delamination either from solvent solution or in situ within a polymer. Coating processes, illustrated by the heterogeneous growth of nanorods onto LDH surfaces, is distinguished from particle nanostructuration. In addition, nanostructuration from LDH frameworks is described for iron‐based oxides and other metal oxides in which catalytic, magnetic, or energy‐storage properties are discussed. Other examples of nanostructuration, such as complex encapsulation, are demonstrated not only with different complexes, such as polyoxometallates and porphyrines but also with rare earth and quantum dot materials, where interest is focused on luminescent and optical properties. Additionally, drug encapsulation and/or release, gene‐reservoir applications, and incorporation of DNA and bioinorganic enzymes into LDH assemblies nicely illustrate biologically related uses of LDH nanoplatelets. Finally, reactions occurring within LDH interlayer spaces are described, and the role of LDH framework as a nanoreactor is illustrated by in situ polymerization of conjugated polymers and thermoplastics. LDH materials can also be used as sacrificial templates for fabricating nanosized polymers and for the synthesis of carbon replica and carbon fibers.

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Thermal decomposition and structural reconstruction effect on Mg–Fe-based hydrotalcite compounds

Cited by 149 publications

References 34 publications

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Functional Materials - Syntheses, Characterisation and Catalytic Applications

Nano/Microporous Materials: Nanostructured Layered Double Hydroxides

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