Table 2.

Functional group for all synthesized materials.

Synthesized sample	Bands (cm–1)
	Ce–O–Ce	C–H	C=O	O–H
CeO2	550	1350	1640	3400
GO-1/CeO2	548	1355	1635	3421`
GO-5/CeO2	547	1360	1630	3423
GO-10/CeO2	542	1370	1627	3425
GO-15/CeO2	541	1377	1625	3427