XPS Study of Pb(II) Adsorption on γ-Al_2O_3 Surface at High pH Conditions

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概要

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• Lead(II) adsorption on γ-Al2O3 at high pH condition (11<pH<13) was studied in NaNO3 solutions. With increasing pH from 11, Pb(II) uptake by γ-Al2O3 was decreased regardless to sodium concentration (0.1 and 1.0 M). XPS spectra showed no chemical shifts occurred in substrate Al (2s, 2p) and O (1s) binding energy by Pb(II) adsorption. Binding energy of adsorbed Pb (4f) had no dependence on pH and adsorption density and was higher than that of orthorhombic yellow PbO and Pb(NO3)2. Molecular orbital (MO) calculation revealed lowest unoccupied molecular orbital (LUMO) energy of Pb(OH)3− was about 6 eV higher than that of Pb(OH)2, and suggested Pb(OH)3− was less reactive than Pb(OH)2 with deprotonated surface hydroxyl ligand. These results suggest that Pb(II) is adsorbed on γ-Al2O3 as inner-sphere surface complex form at high pH condition. Although Pb(II) is adsorbed on γ-Al2O3 as inner-sphere surface complex, bonding between Pb(II) and γ-Al2O3 shows less covalent nature.

• 一般社団法人 日本原子力学会の論文
• 2003-09-25

著者

• IIDA Yoshihisa

  Japan Atomic Energy Agency

• YAMAGUCHI Tetsuji

  Japan Atomic Energy Agency

• YOSHIDA Takahiro

  Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University

• NAKAYAMA Shinichi

  Departments of Hospital Pharmacy Pediatrics

• YAMAGUCHI Tetsuji

  Department of Fuel Cycle Safety Research, Japan Atomic Energy Research Institute

• IIDA Yoshihisa

  Department of Fuel Cycle Safety Research, Japan Atomic Energy Research Institute

• Yoshida Takahiro

  Department Of Fuel Cycle Safety Research Japan Atomic Energy Research Institute

• Yoshida Takahiro

  Department Of Applied Chemistry Graduate School Of Engineering Nagoya University

• Nakayama Shinichi

  Department Of Pediatrics Kakogawa City Hospital

• Nakayama S

  Japan Atomic Energy Agency

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