Preparation and catalytic performance of porous spinel type(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high entropy oxide
The porous spinel type(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high entropy oxide was prepared by solution combustion method.The structure and morphology of the samples were characterized by XRD(X-ray diffractometer),SEM(scanning electron microscope),XPS(X-ray photoelectron spectrometer)and BET(specific surface analyzer).The porous structure of the spinel type(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high entropy oxide was obtained after heat treatment at 550 ℃ for 30 min with glycine as combustion agent.The catalytic activity of PMS(potassium peroxymonosulfate)activated by high-entropy oxides was evaluated by TCH(tetracycline hydrochloride)degradation experiment.The effect of different influencing factors on the degradation of TCH by PMS activated by high entropy oxides was investigated.The degradation rate of TCH was 85％after 30 min reaction at catalyst dosage of 100 mg/L,PMS mass concentration of 100 mg/L,TCH initial mass concentration of 10 mg/L and pH of 5.The results of free radical trapping experiments show that the main active free radical in the catalytic system is SO4-·.The cyclic experiment results show that the degradation rate of TCH by high-entropy oxides remain above 80％after five cycles,indicating excellent cyclic stability.
万方数据
