Table 4.

Band gap values of GO-based photocatalysts.

Photocatalyst	Band Gap, eV; (Max. λ, nm)	Reference
TiO2	3.31	[118]
rGO	N.D.
gC3N4	2.7 (460)	[51]
rGO-gC3N4	N.D.
TiO2	N.D.	[52]
rGO-TiO2	N.D. (415)
TiO2	3.11	[102]
rGO-TiO2(P25)	2.96
TiO2	3.2	[49]
GO-TiO2	2.9–3.05
rGO-TiO2	3.05–3.1
TiO2 (P25)	3.2	[53]
N-TiO2-GO/titan grit sheet	1.8
rGO-ZnO	N.D.	[50]
TiO2	3.02–3.14	[54]
GO-TiO2	2.5

N.D.: no data are given.