Facile Preparation of β-Cyclodextrin-Fe3O4 Magnetic-Brønsted Acidic Ionic Liquid for Biodiesel Production

Brønsted acidic ionic liquid supported on magnetic Fe 3 O 4 [ β -CD-6-Im-(CH 2 ) 3 -HSO 3 ][HSO 4 ]-Fe 3 O 4 was synthesized successfully, the catalyst was characterized via TGA, FT-IR, XRD, SEM, BET and acidity determination, and used to catalyze the high-acidic untreated Jatropha carcass L. seed crude oil (46.0 mg KOH/g) for biodiesel production in a single pot. The results showed that 94.70% yield of FAME was obtained under the optimized reaction conditions of temperature of 130 °C, 10:1 molar ratio of methanol to oil, 3 wt% of catalyst dosage, 3 h reaction time. In addition, the catalyst activity was not significantly decreased after five recycles.