New antimony substituted Mg-AI layered double hydroxides

Jin A. Kim, Seong Ju Hwang, Jin Ho Choy

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

No antimony hydroxide has been previously reported not only in solid state but also in aqueous solution, surely due to the fact that the formation of antimony oxide, Sb 2 O 3 , is thermodynamically more favorable than that of the hydroxide phase, Sb(OH) 3 . According to the pH dependent solubility diagram of Sb 2 O 3 , antimony (III) hydroxide may not exist as a definite compound but be proposed as a hydrated monomeric molecular species, Sb(OH) 3 (aq), which is in equilibrium with Sb 2 O 3 , under a condition of very small ionic strength. This is probably the reason why no Sb 3+ -containing layered double hydroxide, LDH, has been reported as yet. In the present study, an attempt has been made to prepare new Sb 3+ -LDH by substituting the Al 3+ in octahedral site partially with Sb 3+ upto approximately 10%. From the X-ray diffraction analysis, we found that the lattice constants (a = 3.075 Å, c = 23.788 Å) of the pristine, Mg-AI LDH, increased gradually upto those (a = 3.087 Å, c = 24.167 Å) of Sb-LDH (8%-substituted). Beyond 10%, the Sb substitution does not lead to any further increases of lattice constants but the impurity Sb 2 O 3 phase is formed. It is, therefore, concluded that the solubility limit of Sb 3+ in LDH would be around 10%. In addition, we were able to determine the chemical formula of Sb-substituted LDHs as follows, Mg 4 AI 1-x Sb x OH 10 (CO 3 ) 1/2 · H 2 O (x = 0∼0.08) on the basis of energy dispersive X-ray spectroscopy.

Original languageEnglish
Pages (from-to)5172-5175
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume8
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1

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Hydroxides
Antimony
antimony
Solubility
hydroxides
X-Ray Emission Spectrometry
Lattice constants
Carbon Monoxide
X-Ray Diffraction
Osmolar Concentration
solubility
Ionic strength
X ray diffraction analysis
Substitution reactions
Impurities
Oxides
x rays
diagrams
substitutes
aqueous solutions

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

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title = "New antimony substituted Mg-AI layered double hydroxides",
abstract = "No antimony hydroxide has been previously reported not only in solid state but also in aqueous solution, surely due to the fact that the formation of antimony oxide, Sb 2 O 3 , is thermodynamically more favorable than that of the hydroxide phase, Sb(OH) 3 . According to the pH dependent solubility diagram of Sb 2 O 3 , antimony (III) hydroxide may not exist as a definite compound but be proposed as a hydrated monomeric molecular species, Sb(OH) 3 (aq), which is in equilibrium with Sb 2 O 3 , under a condition of very small ionic strength. This is probably the reason why no Sb 3+ -containing layered double hydroxide, LDH, has been reported as yet. In the present study, an attempt has been made to prepare new Sb 3+ -LDH by substituting the Al 3+ in octahedral site partially with Sb 3+ upto approximately 10{\%}. From the X-ray diffraction analysis, we found that the lattice constants (a = 3.075 {\AA}, c = 23.788 {\AA}) of the pristine, Mg-AI LDH, increased gradually upto those (a = 3.087 {\AA}, c = 24.167 {\AA}) of Sb-LDH (8{\%}-substituted). Beyond 10{\%}, the Sb substitution does not lead to any further increases of lattice constants but the impurity Sb 2 O 3 phase is formed. It is, therefore, concluded that the solubility limit of Sb 3+ in LDH would be around 10{\%}. In addition, we were able to determine the chemical formula of Sb-substituted LDHs as follows, Mg 4 AI 1-x Sb x OH 10 (CO 3 ) 1/2 · H 2 O (x = 0∼0.08) on the basis of energy dispersive X-ray spectroscopy.",
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New antimony substituted Mg-AI layered double hydroxides. / Kim, Jin A.; Hwang, Seong Ju; Choy, Jin Ho.

In: Journal of Nanoscience and Nanotechnology, Vol. 8, No. 10, 01.10.2008, p. 5172-5175.

Research output: Contribution to journalArticle

TY - JOUR

T1 - New antimony substituted Mg-AI layered double hydroxides

AU - Kim, Jin A.

AU - Hwang, Seong Ju

AU - Choy, Jin Ho

PY - 2008/10/1

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N2 - No antimony hydroxide has been previously reported not only in solid state but also in aqueous solution, surely due to the fact that the formation of antimony oxide, Sb 2 O 3 , is thermodynamically more favorable than that of the hydroxide phase, Sb(OH) 3 . According to the pH dependent solubility diagram of Sb 2 O 3 , antimony (III) hydroxide may not exist as a definite compound but be proposed as a hydrated monomeric molecular species, Sb(OH) 3 (aq), which is in equilibrium with Sb 2 O 3 , under a condition of very small ionic strength. This is probably the reason why no Sb 3+ -containing layered double hydroxide, LDH, has been reported as yet. In the present study, an attempt has been made to prepare new Sb 3+ -LDH by substituting the Al 3+ in octahedral site partially with Sb 3+ upto approximately 10%. From the X-ray diffraction analysis, we found that the lattice constants (a = 3.075 Å, c = 23.788 Å) of the pristine, Mg-AI LDH, increased gradually upto those (a = 3.087 Å, c = 24.167 Å) of Sb-LDH (8%-substituted). Beyond 10%, the Sb substitution does not lead to any further increases of lattice constants but the impurity Sb 2 O 3 phase is formed. It is, therefore, concluded that the solubility limit of Sb 3+ in LDH would be around 10%. In addition, we were able to determine the chemical formula of Sb-substituted LDHs as follows, Mg 4 AI 1-x Sb x OH 10 (CO 3 ) 1/2 · H 2 O (x = 0∼0.08) on the basis of energy dispersive X-ray spectroscopy.

AB - No antimony hydroxide has been previously reported not only in solid state but also in aqueous solution, surely due to the fact that the formation of antimony oxide, Sb 2 O 3 , is thermodynamically more favorable than that of the hydroxide phase, Sb(OH) 3 . According to the pH dependent solubility diagram of Sb 2 O 3 , antimony (III) hydroxide may not exist as a definite compound but be proposed as a hydrated monomeric molecular species, Sb(OH) 3 (aq), which is in equilibrium with Sb 2 O 3 , under a condition of very small ionic strength. This is probably the reason why no Sb 3+ -containing layered double hydroxide, LDH, has been reported as yet. In the present study, an attempt has been made to prepare new Sb 3+ -LDH by substituting the Al 3+ in octahedral site partially with Sb 3+ upto approximately 10%. From the X-ray diffraction analysis, we found that the lattice constants (a = 3.075 Å, c = 23.788 Å) of the pristine, Mg-AI LDH, increased gradually upto those (a = 3.087 Å, c = 24.167 Å) of Sb-LDH (8%-substituted). Beyond 10%, the Sb substitution does not lead to any further increases of lattice constants but the impurity Sb 2 O 3 phase is formed. It is, therefore, concluded that the solubility limit of Sb 3+ in LDH would be around 10%. In addition, we were able to determine the chemical formula of Sb-substituted LDHs as follows, Mg 4 AI 1-x Sb x OH 10 (CO 3 ) 1/2 · H 2 O (x = 0∼0.08) on the basis of energy dispersive X-ray spectroscopy.

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