ZnO/NiO纳米异质结的合成及其光催化性能的研究

Synthesis and Photocatalytic Properties of ZnO / NiO Heterojunction

通过超声法成功制备出形貌均一的ZnO/NiO异质结光催化材料,并采用X射线衍射仪（XRD）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）以及光致发光光谱（PL）等分析测试手段对样品的形貌和结构进行了表征。结果表明,ZnO/NiO异质结是由直径约400~600nm的ZnO纳米球镶嵌着NiO纳米颗粒组成。对比纯NiO纳米颗粒、纯ZnO纳米球和ZnO/NiO异质结对罗丹明B（RhB）的紫外光降解效率,ZnO/NiO异质结表现了最好的光催化活性,这主要是由于ZnO/NiO异质结可以有效的分离光生电子和空穴对,使得它们的复合机率降低,提高其光催化效率。

Homogeneous ZnO / NiO photocatalytic materials were synthesized by ultrasonic method. The structures and morphologies of ZnO / NiO heterojunction were investigated by X-ray diffraction（ XRD）,field emission scanning electron microscopy（ FESEM）,transmission electron microscopy（ TEM） and PL spectra. The results indicate that ZnO / NiO heterojunction consist of ZnO nanospheres coated by NiO nanoparticles. Comparing the degradation efficiency of Rh B under UV irradiation with pure NiO nanoparticles,pure ZnO nanospheres and ZnO / NiO heteronanostructures,ZnO / NiO heterostructures photocatalysts possess higher photocatalytic efficiency. The enhanced photocatalytic activity is mainly because ZnO / NiO heteronanostructures promote the separation of photogenerated electrons and holes,decrease the recombination probability,and thus improve the photocatalytic efficiency.