Effects of metal cation substitution on hexavalent chromium reduction by green rust

Table 3 EXAFS fitting parameters for all Fe K-edge EXAFS spectra

Sample	k-range	R-value	S²₀	Shell: ΔE₀ (eV)	Fe-0 CN	R (Å)	σ² (Å⁻²)	Fe–Fe (edge-sharing) CN	R (Å)	σ² (Å⁻²)	Fe–Fe (corner-sharing) CN	R (Å)	σ² (Å⁻²)
Feroxyhyte	4–14	0.014	0.9*	− 4.19	6*	1.98	0.013	2.80 ± 13%	3.03	0.015*	2.39 ± 20%	3.41	0.015*
oxGR	4–11	0.004	0.9*	− 4.63	6*	1.98*	0.011	3.88 ± 10%	3.05	0.015*	2.49 ± 20%	3.41	0.015*
oxAl-GR	4–14	0.011	0.9*	− 4.56	6*	1.98*	0.012	3.19 ± 12%	3.04	0.015*	2.59 ± 20%	3.38	0.015*
oxMg-GR	4–13	0.008	0.9*	− 4.11	6*	1.98*	0.012	3.18 ± 10%	3.02	0.015*	2.23 ± 20%	3.41	0.015*
oxZn-GR	4–13	0.006	0.9*	− 4.2	6*	1.98*	0.012	3.73 ± 10%	3.05	0.015*	2.26 ± 20%	3.41	0.015*

ISSN: 1467-4866