Table 11. List of Some Important Examples of Photocatalytic Degradation of Organic Contaminants Using GO-Based Photocatalysts.

Graphene-oxide-based entity	Method of preparation	Photocatalytic activity	Degradation efficiency	Role of GO	Refs
MIL-68(In)-NH2/GO composite	Hummers method	Degradation of amoxicillin	93% in 120 min	GO acts as an electron transporter by inhibiting recombination of photogenerated charge carriers	(30)
Nb-doped TiO2 nanotube/rGO	Hydrothermal method	Degradation of methylene blue	95% in 30 min	Formation of electron transport channel by GO contributing toward photoinduced charge separation	(31)
ZnO–GO hybrid	Ultrasonication	Degradation of methylene blue	80% in 70 min	Photoinduced charge transfer interactions contributing to reduced charge recombination	(174)
Anatase TiO2–GO nanocomposite	Solvothermal method	Degradation of gaseous benzene	-	Synergistic effect of graphene and TiO2 results in efficient charge separation	(32)
Honeycomb-like TiO2@GO nanocomposites	Solvothermal method	Degradation of oxytetracycline		Graphene-promoted red shift of absorption band and improved absorption efficiency of TiO2@GO	(182)
ZnO/CdS/RGO composites	Hydrothermal process	Removal of Cr(VI) ions	93.2%	RGO-reduced agglomeration of NPs and increased specific surface area	(183)
Photoreduced GO/TiO	UV-assisted photoreduction method	Removal of VOC (methanol)	100% in 40 min	Suppression of charge recombination	(184)
SnO2/rGO nanocomposite	Hydrothermal method	Degradation of methylene blue	90%	rGO reduced the band gap of SnO2, making it photocatalytically efficient	(180)
Au–SnO2–rGO	Microwave irradiation	Degradation of clothianidin	97%	rGO decreased the charge recombination rate by acting as an electron sink	(175)
GO/TiO2	Sol–gel, Hummers method	Degradation of E. coli	7.5 times better degradation	Reduction of GO platelets to graphene, thereby improving antibacterial activity	(176)
S-doped GO (sGO)/Ag3VO4	Modified Hummers method	Degradation of methylene blue, rhodamine B, and acid red 18	3.67, 49, 50, and 3.19 times better degradation for Ag3VO4, sGO, and sGO/Ag3VO4, respectively	sGO is an excellent carrier separator boosted by electrons and surface defects	(178)
Graphene–TiO2	Drop casting method	Degradation of Caenorhabditis elegans	19 times better degradation	The rate of recombination of photoexcited electron–hole pairs is slowed down by graphene	(179)
GO–tungsten (W)	Modified Hummers method	Degradation of bacteriophage MS2 virus (having RNA genome enveloped in protein capsid)	<10% reduction in the RNA efflux	Trapping cells within aggregated graphene nanosheets	(177)
	Drop casting method			Generation of ROS by graphene