将六水硝酸铈(Ce(NO₃)₃•6H₂O)与尿素按照质量分数为1:10的比例，均匀溶解适量的实验室自制的去离子水中，然后加入质量浓度为3 g⸱L^-1的十六烷基三甲基溴化铵(CTAB)和适量的丙三醇，并伴随着搅拌器搅拌，直至反应结束。将所得溶液转移到30 mL的带有聚四氟乙烯内衬的高压釜中，调节水热箱温度，控制水热反应温度为180 ℃，反应时间控制为8 h，将所得产物通过离心机分离后用水以及无水乙醇反复洗涤5次，将得到的白色粉末在真空干燥箱中干燥12 h，放入真空管式高温炉中800 ℃煅烧4 h，即可得到纳米球形氧化铈。XRD试验电压为40 KV，步长为8°/min，测试范围为10-90°。用SIRION200场发射扫描电子显微镜(FESEM)观察了其显微结构和粒径。

Cerium nitrate hexahydrate (Ce(NO₃)₃•6H₂O) and urea were homogeneously dissolved in an appropriate amount of homemade laboratory deionized water in the ratio of 1:10 by mass fraction, and then cetyltrimethylammonium bromide (CTAB) with a mass concentration of 3 g⸱L^-1 and an appropriate amount of propanetriol were added and accompanied by stirrer stirring until the reaction was completed. The resulting solution was transferred to a 30 mL autoclave with PTFE liner, and the temperature of the hydrothermal chamber was adjusted to control the hydrothermal reaction temperature of 180 ℃ and the reaction time of 8 h. The resulting product was separated by centrifugation and washed repeatedly with water and anhydrous ethanol for 5 times, and the white powder was dried in a vacuum drying oven for 12 h and calcined in a vacuum tube furnace at 800 ℃ for 4 h to The XRD test voltage was 40 KV, the step size was 8°/min, and the test range was 10-90°. The microstructure and particle size were observed by SIRION200 field emission scanning electron microscope (FESEM).