Table 2.

Catalytic comparison study of known heterogeneous catalysts in the reduction of nitrophenol

Entry	Catalyst	Reductant	Time (min)
1	Graphene–Cu36Ni64	NH3BH3 (3 mmol)	30 [37]
2	Cu–Ni–AAPTMS@GO	NaBH4 (1.5 mmol)	4 [38]
3	Ru50Ni50/RGONCs	NH3BH3 (2 mmol)	4.5 [39]
4	Pt/RGO	H2 (1 MPa)	120 [40]
5	(Co6)Ag0.1Pd0.9/RGO	HCOONH4 (4 mmol)	20 [41]
6	Pd/GO	NaBH4 (1.2 mmol)	10 [42]
7	MRN–Pd	NaBH4 (1.2 mmol)	45 [43]
8	CuSO4/GO	NaBH4 (1.2 mmol)	30 [This work]