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

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

研究成果: Article査読

21 被引用数 (Scopus)

抄録

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-.

本文言語English
ページ(範囲)1809-1817
ページ数9
ジャーナルMaterials Transactions
54
9
DOI
出版ステータスPublished - 2013

ASJC Scopus subject areas

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

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