Photocatalytic Activity in Phenol Removal of Water from Graphite and Graphene Oxides: Effect of Degassing and Chemical Oxidation in the Synthesis Process

Table 2

Band gap values (), indirect (I) and direct (D), obtained through spectra of UV-vis for all samples of GO and GEO.

Sample	(I) eV	(D) eV
GO2	2.80	4.70
GO4	1.94	4.90
GO6	1.90	3.96
GEO-2-55	1.87	4.04
GEO-4-55	1.89	4.1
GEO-6-55	1.89	4.07
GEO-2-65	1.5	4.0
GEO-4-65	2.05	4.6
GEO-6-65	2.1	4.0