Characteristic Sorption of H3BO3/B(OH) 4- on magnesium oxide

Keiko Sasaki, Xinhong Qiu, Sayo Moriyama, Chiharu Tokoro, Keiko Ideta, Jin Miyawaki

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Abstract

The reaction mechanism of H3BO3/B(OH)4- with MgO in aqueous phase was investigated using sorption isotherm, XRD, 11B-NMR and FTIR. Release of Mg2+ was observed soon after contact of MgO with H3BO3 and maximum released Mg2+ was proportional to the initial boron concentration, suggesting ligand-promoted dissolution of MgO by H3BO3. The molecular form of H3BO3 was more reactive with MgO in releasing Mg2+ ions than B(OH)4 -. 11B-NMR results indicated that trigonal B ( [3]B) was predominant over tetrahedral B ([4]B) in solid residues after sorption of H3BO3. The molar ratio of [4]B/[3]B increased with H3BO3 sorption density. XRD patterns for the solid residues were assigned to Mg(OH)2 and peaks broadened with increasing H3BO 3 sorption density, except for (hk0) planes due to c-axis lattice strain induced by incorporation of H3BO3 between layers. These results indicated that H3BO3 interfered in the c-axis stacking of in Mg(OH)2. Molecular H3BO3 acted as a trigger when reacting with the MgO surface, releasing Mg2+ to produce an unstable complex leading to the precipitation formation of Mg(OH) 2, which is a sink for the immobilization of H3BO 3/B(OH)4-.

Original languageEnglish
Pages (from-to)1809-1817
Number of pages9
JournalMaterials Transactions
Volume54
Issue number9
DOIs
Publication statusPublished - Sep 4 2013

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Magnesium Oxide
magnesium oxides
Magnesia
sorption
Sorption
releasing
Nuclear magnetic resonance
nuclear magnetic resonance
Boron
sinks
immobilization
Isotherms
dissolving
isotherms
Dissolution
boron
actuators
Ligands
Ions
ligands

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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Characteristic Sorption of H3BO3/B(OH) 4- on magnesium oxide. / Sasaki, Keiko; Qiu, Xinhong; Moriyama, Sayo; Tokoro, Chiharu; Ideta, Keiko; Miyawaki, Jin.

In: Materials Transactions, Vol. 54, No. 9, 04.09.2013, p. 1809-1817.

Research output: Contribution to journalArticle

Sasaki, Keiko ; Qiu, Xinhong ; Moriyama, Sayo ; Tokoro, Chiharu ; Ideta, Keiko ; Miyawaki, Jin. / Characteristic Sorption of H3BO3/B(OH) 4- on magnesium oxide. In: Materials Transactions. 2013 ; Vol. 54, No. 9. pp. 1809-1817.
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AB - The reaction mechanism of H3BO3/B(OH)4- with MgO in aqueous phase was investigated using sorption isotherm, XRD, 11B-NMR and FTIR. Release of Mg2+ was observed soon after contact of MgO with H3BO3 and maximum released Mg2+ was proportional to the initial boron concentration, suggesting ligand-promoted dissolution of MgO by H3BO3. The molecular form of H3BO3 was more reactive with MgO in releasing Mg2+ ions than B(OH)4 -. 11B-NMR results indicated that trigonal B ( [3]B) was predominant over tetrahedral B ([4]B) in solid residues after sorption of H3BO3. The molar ratio of [4]B/[3]B increased with H3BO3 sorption density. XRD patterns for the solid residues were assigned to Mg(OH)2 and peaks broadened with increasing H3BO 3 sorption density, except for (hk0) planes due to c-axis lattice strain induced by incorporation of H3BO3 between layers. These results indicated that H3BO3 interfered in the c-axis stacking of in Mg(OH)2. Molecular H3BO3 acted as a trigger when reacting with the MgO surface, releasing Mg2+ to produce an unstable complex leading to the precipitation formation of Mg(OH) 2, which is a sink for the immobilization of H3BO 3/B(OH)4-.

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