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Table 2 EXAFS fitting results of Ni for model compounds and sorption samples (S 20  = 0.93)

From: Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study

Sample Shells CN R (Å) σ22) Rf ΔE0 (ev)
Ni(NO3)2 aq. Ni–O 6.0a 2.06 0.005 0.0010 − 0.90
Ni–Al LDH Ni–O 5.8 2.06 0.006   2.00
  Ni–Ni 3.5 3.07 0.007 0.0005  
  Ni–Al 0.8 3.06 0.007   
Ni–Zn–Al LTH Ni–O 6.3 2.06 0.007   2.86
  Ni–Ni/Zn 3.5 3.07 0.008 0.0010  
  Ni–Al 1.3 3.06 0.008   
Ni–Al Alox Ni–O 5.3 2.06 0.005   2.56
  Ni–Ni 3.4 3.06 0.008 0.0014  
  Ni–Al 1.9 3.05 0.008   
Ni–Zn–Al Alox Ni–O 5.5 2.06 0.005   2.57
  Ni–Ni/Zn 4.1 3.07 0.008 0.0010  
  Ni–Al 1.5 3.06 0.008   
  1. Estimated errors for the first shell are ± 20% for coordination number, ± 0.01 Å for bond distance and ± 0.001 Å2 for Debye–Waller factors, and for second shell ± 40% for coordination numbers, ± 0.04 Å for bond distances and ± 0.005 Å2 for Debye–Waller factors
  2. CN coordination number and were determined by the fit, R the interatomic distance in Å, σ2 the Debye–Waller factor in Å2, R f the absolute misfit between data and theory, ΔE 0 the energy shift in eV
  3. aFixed value
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