纳米氧化锌/γ-氧化铝复合物制备及其光催化性能研究

Preparation and photocatalytic performance of nano-sized ZnO/Al_2O_3 composites

以γ-氧化铝(γ-Al2O3)为载体,采用均匀沉淀法制备了不同氧化锌(ZnO)负载量的纳米ZnO/γ-Al2O3复合物。通过X射线衍射(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)和氮气吸附,对复合物的结构、表面形貌、组成和比表面积进行了表征。以壬基酚聚氧乙烯醚(NPE-10)和苯酚为模型污染物,对复合物的光催化性能进行了评价。结果表明:当ZnO与γ-Al2O3按质量比为2∶1加料制备ZnO/γ-Al2O3复合物时,ZnO成功负载到γ-Al2O3表面,并形成均匀的薄膜;以制备的ZnO/γ-Al2O3复合物为催化剂在紫外光照射2 h后NPE-10的降解率达到93%,苯酚的降解率达到20%,且它们的降解率均随着溶液初始浓度的增大而降低。

Nano-sized ZnO/γ-Al2O3 composites with different ZnO loadings were prepared by homogeneous precipitation method and with γ-Al2O3was employed as supporter. Structure, surface morphology, composition, and specific surface area of composites were characterized by X - ray diffraction （ XRD ）, scanning electron microscopy （ SEM ）, FT - IR, and N2 adsorption. Photocatalytic performance of composites were appraised using nonylphenyl poly（oxyethylene） ether （NPE -10） and phenol as model pollutants. Resuh indicated that ZnO was successfully loaded on the surface of γ-Al2O3 When the mass ratio of ZnO to γ-Al2O3 was 2：1 ,ZnO thin films were uniformly immobilized on the surface of γ-Al2O3 ,and the photoeatalytic performance of ZnO/γ-Al2O3 composite which was prepared under these conditions and the effect of initial NPE- 10 and phenol concentration on the degradation rate were investigated. It was found that the degradation rate of NPE -10 and phenol reached 93% and 20% , respectively, when they were irradiated by the ultraviolet light for 2 h, and their degradation rates were decreasing with the initial concentration enhancement.