The
reaction mixture was stirred at 80 ◦C. After 12 h, 20 mL of water
was added to decrease the viscosity of ionic liquid. The produced
TiO2 NPs were collected by centrifugation, washed with acetonitrile
(8
×
25 mL) and CH2Cl2 (5
×
25 mL). Then, the product was dried at
100 ◦C for 24 h under vacuum.