Table 2. Porosity data for GNs and Fe-GNs.

Sample	Fe wt%	Finishing	Surface area a (m2 g–1)	Pore size b (nm)	Pore volume c (cm3 g–1)
D-GN	0	Air dried	12	Nil	Nil
GN	0	Calcined	347	3.5	0.23
D-Fe@GN	50	Air dried	244	18.6	0.75
Fe@GN	50	Calcined	203	18.6	0.6
R-Fe@GN	50	Reduced	129	18	0.47

^aCalculated by the BET model from sorption data in a relative pressure range from 0.05 to 0.25.

^bCalculated by the BJH model from the desorption branches of isotherms.

^cCalculated from N₂ amount adsorbed at a relative pressure P/P ₀ of 0.99.