Oxidation of sulfides in presence of Fe₃O₄@BNPs-SiO₂–SO₃H with H₂O₂ in ethanol.

Entry	Substrate	Sulfoxidesa			Sulfonesb
		Time (min)	Yield (%)	MPref.	Time (min)	Yield (%)	MPref.
1		5	94	29–3038	10	92	83–8539
2		5	98	69–7138	10	98	125–12626
3		2	98	120–12140	10	94	146–14841
4		8	98	135–13638	15	96	149–15126
5		10	95	13742	20	95	175–17743
6		20	92	16242	45	96	203–20542
7		10	95	Oil44	25	90	25–2845
8		10	94	17146	30	96	212–21443
9		10	96	3047	20	96	44–461
10		10	94	Oil46	20	92	Oil1
11		15	92	151–15248	30	90	Oil1
12		20	92	110–11143	40	90	110–11242
13		10	92	Oil49	25	92	Oil50
14		10	94	20151	20	94	185–18742

^aReaction conditions: sulfide (1 mmol), H₂O₂ (0.3 mL), catalyst (0.075 g) at 25 °C in EtOH.

^bReaction conditions: sulfide (1 mmol), H₂O₂ (0.4 mL), catalyst (0.1 g) at 50 °C in EtOH.