Preparation of CeO2 nanoparticles
CeO2 nanoparticles were prepared via microemulsion technique and two-phase liquid–liquid method. The schematic diagram of experimental procedure was shown in Fig. 1. Firstly,
3 mL of 0.1 mol/L Ce(NO3)3 solution was dissolved in 5 g CTAB, 10 mL butanol, 50 mL cyclohexane mixed solvent with vigorous stirring till the system was formed a transparent microemulsion. In the same way, 5 ml of 2 mol/L ammonia was added in the same mixed solvent to form a transparent system.