Microwave-Assisted Synthesis of CuO Nanoparticles Using Cordia africana Lam. Leaf Extract for 4-Nitrophenol Reduction

Table 1

Comparison of the catalytic activity of CuO NPs with the previously reported CuO-based catalysts for the reduction of 4-NP.

Catalyst	4-NP (x10^−3 mmol)	NaBH4 (x10^−3 mmol)	Catalyst amount (mg)	Time (min)	Rate constant, kapp (min^−1)	Ratio constant K, (min^−1·g^−1)	Ref
CuO nanoleaves	0.36	30	1	15	0.022	22	[71]
CuO flowers	0.25	50	2	4	0.565	282.5	[72]
Pd/CuO NPs	62.5	6250	7	1	3.3	471	[73]
CuO@C	100	2250	50	18	0.36	7.2	[74]
CuO/ZnO/Eggshell	2	1320	20	30	0.2037	6.79	[75]
CuO/Cu2O nanowires	0.25	50	0.1	4	0.5014	125.35	[76]
CuO NPs	14.38	528	5	12	0.379	75.8	Present work