Novel route to synthesize CaAl- and MgAl-layered double hydroxides with highly regular morphology

Szabolcs Muráth, Zoltán Somosi, Á. Kukovecz, Z. Kónya, P. Sipos, I. Pálinkó

Research output: Contribution to journalArticle

Abstract

A facile, sol–gel method was developed to obtain Al-containing layered double hydroxides (LDHs) with Ca or Mg divalent cations. Ca- and Al-alkoxide were added to aqueous NaNO3 solution, and, after rapid gelation, a solid product, phase-pure, highly crystalline CaAl–LDH was formed with exceptionally regular morphology without impurities for the first time with sol–gel method. The lack of salt in the solution used for the hydrolysis resulted in a non-desirable by-product (katoite). For the sol–gel synthesis of MgAl–LDH, it was found that its formation was less sensitive to the presence of nitrate ions, and pure water or aqueous NaOH worked equally well. The product was also a highly crystalline material with thin, plate-like morphology as revealed by X-ray diffractometry and scanning electron microscopy. IR measurements indicate the lack of organic substance in the interlamellar space for both materials.

Original languageEnglish
JournalJournal of Sol-Gel Science and Technology
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

Hydroxides
hydroxides
routes
Crystalline materials
thin plates
Divalent Cations
alkoxides
gelation
Gelation
products
Nitrates
X ray diffraction analysis
Byproducts
hydrolysis
nitrates
Hydrolysis
Salts
Positive ions
Impurities
Ions

Keywords

  • CaAl- and MgAl-layered double hydroxides
  • Crystals with regular morphology
  • Metal alkoxides
  • Sol–gel process
  • X-ray diffractometry and microscopic analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

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title = "Novel route to synthesize CaAl- and MgAl-layered double hydroxides with highly regular morphology",
abstract = "A facile, sol–gel method was developed to obtain Al-containing layered double hydroxides (LDHs) with Ca or Mg divalent cations. Ca- and Al-alkoxide were added to aqueous NaNO3 solution, and, after rapid gelation, a solid product, phase-pure, highly crystalline CaAl–LDH was formed with exceptionally regular morphology without impurities for the first time with sol–gel method. The lack of salt in the solution used for the hydrolysis resulted in a non-desirable by-product (katoite). For the sol–gel synthesis of MgAl–LDH, it was found that its formation was less sensitive to the presence of nitrate ions, and pure water or aqueous NaOH worked equally well. The product was also a highly crystalline material with thin, plate-like morphology as revealed by X-ray diffractometry and scanning electron microscopy. IR measurements indicate the lack of organic substance in the interlamellar space for both materials.",
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author = "Szabolcs Mur{\'a}th and Zolt{\'a}n Somosi and {\'A}. Kukovecz and Z. K{\'o}nya and P. Sipos and I. P{\'a}link{\'o}",
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T1 - Novel route to synthesize CaAl- and MgAl-layered double hydroxides with highly regular morphology

AU - Muráth, Szabolcs

AU - Somosi, Zoltán

AU - Kukovecz, Á.

AU - Kónya, Z.

AU - Sipos, P.

AU - Pálinkó, I.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - A facile, sol–gel method was developed to obtain Al-containing layered double hydroxides (LDHs) with Ca or Mg divalent cations. Ca- and Al-alkoxide were added to aqueous NaNO3 solution, and, after rapid gelation, a solid product, phase-pure, highly crystalline CaAl–LDH was formed with exceptionally regular morphology without impurities for the first time with sol–gel method. The lack of salt in the solution used for the hydrolysis resulted in a non-desirable by-product (katoite). For the sol–gel synthesis of MgAl–LDH, it was found that its formation was less sensitive to the presence of nitrate ions, and pure water or aqueous NaOH worked equally well. The product was also a highly crystalline material with thin, plate-like morphology as revealed by X-ray diffractometry and scanning electron microscopy. IR measurements indicate the lack of organic substance in the interlamellar space for both materials.

AB - A facile, sol–gel method was developed to obtain Al-containing layered double hydroxides (LDHs) with Ca or Mg divalent cations. Ca- and Al-alkoxide were added to aqueous NaNO3 solution, and, after rapid gelation, a solid product, phase-pure, highly crystalline CaAl–LDH was formed with exceptionally regular morphology without impurities for the first time with sol–gel method. The lack of salt in the solution used for the hydrolysis resulted in a non-desirable by-product (katoite). For the sol–gel synthesis of MgAl–LDH, it was found that its formation was less sensitive to the presence of nitrate ions, and pure water or aqueous NaOH worked equally well. The product was also a highly crystalline material with thin, plate-like morphology as revealed by X-ray diffractometry and scanning electron microscopy. IR measurements indicate the lack of organic substance in the interlamellar space for both materials.

KW - CaAl- and MgAl-layered double hydroxides

KW - Crystals with regular morphology

KW - Metal alkoxides

KW - Sol–gel process

KW - X-ray diffractometry and microscopic analysis

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