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利用水热法制备了ZnO/ZnFe2O4纳米复合粒子。用扫描电子显微镜(SEM)、X射线衍射(XRD)、光致发光光谱(PL)对退火前后的ZnO/ZnFe2O4纳米粒子进行表征。研究结果表明,退火后的ZnO/ZnFe2O4纳米复合粒子表现出更好的形貌和晶体质量,主要由六角纤锌矿结构的ZnO和立方结构的ZnFe2O4构成。PL光谱显示,退火后ZnO近带边的发光强度明显降低,这是由于ZnO/ZnFe2O4形成了Ⅱ型能带结构实现了光生载流子分离的结果。对其光催化特性也进行了研究,光照时间为3h,退火后的ZnO/ZnFe2O4纳米复合粒子表现出更优秀的光催化活性,降解甲基橙的效率可达50.48%。另外,还对其磁性进行了研究,室温条件下,纳米复合粒子表现为顺磁性,而经过退火处理后表现出铁磁性。因此,ZnO/ZnFe2O4纳米复合粒子经退火后具备磁性光催化剂性能,有一定的发展前景。
ZnO / ZnFe2O4 nanocomposite particles were prepared by hydrothermal method. The ZnO / ZnFe2O4 nanoparticles before and after annealing were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and photoluminescence (PL). The results show that annealed ZnO / ZnFe2O4 nanocomposite particles show better morphology and crystal quality, mainly composed of hexagonal wurtzite ZnO and cubic structure ZnFe2O4. PL spectra showed that the emission intensity near the ZnO side after annealing was significantly reduced due to the formation of the type II band structure of ZnO / ZnFe2O4 resulting in the photo-generated carrier separation. The photocatalytic properties of the ZnO / ZnFe2O4 nanocomposites were also studied. The irradiation time was 3h, and the ZnO / ZnFe2O4 nanocomposite particles showed better photocatalytic activity. The efficiency of methyl orange degradation was up to 50.48%. In addition, the magnetism was also studied. Under room temperature, the nanocomposite particles exhibited paramagnetic properties and ferromagnetism after annealing treatment. Therefore, ZnO / ZnFe2O4 nano-composite particles have the properties of magnetic photocatalysts after annealing, which has certain prospects for development.