Comparison of the catalytic activity of rGO@Fe₃O₄/ZrCp₂Cl_x for reduction of nitroarenes with other reported catalyst systems.

Entry	Catalyst (mg)	Reductant	Time	Yield (%)	Conditions	Ref.
1	Present work	N2H4·H2O	10 min	95–100	20 mg, EtOH, 70 °C	—
2	Fe-phen/C-800	H2 (g)	15 h	90–96	50 bar H2, H2O–THF, 120 °C	79
3	Co3O4@Al2O3/SiO2	N2H4·H2O	2 h	90–100	2 mol%, EtOH, 60 °C	80
4	Ru-CNT	N2H4·H2O	3 h	95–100	N2 atm, THF, r.t.	81
5	Iron oxide hydroxide [FeO(OH)]	N2H4·H2O	5 h	95–100	30 mg, EtOH, 70 °C	82
6	rGO/Cu2O–CuO	N2H4·H2O	2–3 h	95–100	50 mg, MeOH–CH2Cl2–CH3CN visible light, r.t.	83
7	rGO/BiVO4	N2H4·H2O	1–2 h	95–100	50 mg, visible light, r.t.	84
8	Ir/ZrO2·xH2O	H2(g)	2–3 h	95–100	25 mg, EtOH–H2O, 1 atm	85
9	Au@Zr-phosphonate	NaBH4	2–3 h	80–90	2 mol%, EtOH, 30 °C	86