Composition of 4% Cu–ZnO/S-g-C₃N₄ nanocomposites and their corresponding photocatalytic activities.

S. no.	Nanocomposites	wt% ratio of heterostructures			Sample abbreviations
		S-g-C3N4	4% Cu@ZnO	(S-g-C3N4 : Cu@ZnO) ratio
1	4% Cu–ZnO/S-g-C3N4	50	50	(1 : 1)	CZS-50
2	4% Cu–ZnO/S-g-C3N4	75	25	(3 : 1)	CZS-75
3	4% Cu–ZnO/S-g-C3N4	83.33	16.67	(5 : 1)	CZS-83
4	4% Cu–ZnO/S-g-C3N4	25	75	(1 : 3)	CZS-25
5	S-g-C3N4	100	00	(1 : 0)	SGN
6	4% Cu–ZnO	00	100	(0 : 1)	4-CZN
7	ZnO/S-g-C3N4				ZS