关键词: 四氧化三铁, 氧化锌, 核壳结构, 光催化降解, 四环素类抗生素

Abstract: Magnetic Fe3O4/ZnO core-shell nano-materials were successfully prepared by using a two-step procedure with coprecipitation and annealing treatment. The material composition, morphology and magnetic properties were examined and verified by means of X-ray diffraction(XRD), infrared spectroscopy(IR), transmission electron microscopy(TEM) and vibrating sample magnetometer(VSM). The photocatalytic degradation activity of the compound in the sunlight was evaluated by xenon lamp irradiating on tetracycline(TC), doxycycline(DC) and oxytetracycline(OTC), three tetracycline antibiotics, and the best performance of photocatalytic degradation activity was tailored by the concentration of zinc precursor. The results show that ZnO coated on the surface of Fe3O4 gradually forms 100 nm conical structure with increasing Zn2+ concentration. When Zn2+ concentration is 0.5 mol/L, the max degradation rate of TC, DC and OTC antibiotics is 85%, 78% and 64%, respectively. On the basis of the above points, the synthesized magnetic Fe3O4/ZnO core-shell materials can be used for water antibiotics removal, and it will be a new composite photocatalyst with high catalytic activity and recover ability.

Key words: ferroferric oxide, Zinc oxide, core-shell structure, photocatalysis, tetracycline antibiotics