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Table 3 EXAFS fitting results of Zn for model compounds and sorption samples (S 20  = 0.85)

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)

Zn(NO3)2 aq.

Zn–O

6.0a

2.06

0.006

0.0002

1.16

Zn–Al LDH

Zn–O

6.5

2.08

0.008

 

0.89

 

Zn–Zn

3.5

3.10

0.010

0.0005

 
 

Zn–Al

2.4

3.09

0.010

  

Zn-Ni–Al LTH

Zn–O

6.6

2.08

0.008

 

2.85

 

Zn–Zn/Ni

4.6

3.08

0.010

0.0010

 
 

Zn–Al

1.6

3.07

0.010

  

Zn–Al Alox

Zn–O

6.2

2.06

0.009

 

1.23

 

Zn–Zn

4.3

3.09

0.010

0.0015

 
 

Zn–Al

2.4

3.08

0.010

  

Zn–Ni–Al Alox

Zn–O

6.9

2.08

0.010

 

1.182

 

Zn–Zn/Ni

5.3

3.09

0.011

0.0018

 
 

Zn–Al

1.4

3.08

0.011

  
  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