Table 1.

Studies on the reduction of 4-NP using various catalysts.

Catalyst	kapp (s−1)	Activity Factor, K (s−1 mg−1)	Reference
CuNWs (0.1 pg)	0.076	7.6 × 108	This study
Cu@MnO2	0.01142	0.571	[12]
CuNPs (12.5 mg)	0.0016	0.00013	[17]
CuNWs	0.0042	0.046	[21]
CuNW–Ag	0.0067	0.074	[21]
CuCubes (9.5 nm)	0.0101	0.105	[22]
CuNanoplate	0.0095	0.136	[46]
Porous Cu microsphere	0.0043	0.072	[47]