Table 1.

Energy dispersive spectroscopy (EDS) elemental analysis of carbon materials investigated.

Elements	Graphite		Norit SA Super		GO_AD		GO_L
	Wt. %	At. %	Wt. %	At. %	Wt. %	At. %	Wt. %	At. %
C	100	100	90.28	94.38	47.33	55.30	54.01	61.51
O			5.01	3.93	49.27	43.21	44.05	37.66
S					3.40	1.49	1.94	0.83
Mg			0.91	0.47
Al			0.47	0.22
Si			0.54	0.24
Ca			1.51	0.47
Fe			1.28	0.29

GO_AD—graphene oxide after air drying; GO_L—graphene oxide after lyophilization; Wt—Weight; At—Atomic.