纳米氧化锌的制备、表征和光催化性能分析

Preparation and Characterization of Nano ZnO and Its Analysis of Photo-catalytic Properties

均匀沉淀法制备的纳米氧化锌是球形和类球形晶体颗粒,粒径介于21.729～50.553nm之间。研究分析了纳米氧化锌的光吸收能力、光致发光特性和催化能力之间的关系。结果表明,ZnO粒子尺寸越小,紫外吸收越好,光致发光特性越强,表面结构氧空位越大,光催化反应活性越高。初步揭示了纳米氧化锌的催化机制在于纳米颗粒的小尺寸效应和量子效应,以及表面丰富的吸附氧和结构缺陷。

Nan0 ZnO synthesized by the method of uniform precipitation is in shape of sphere or similar ones, the diameter of nano-ZnO Crystal is in the range of 21. 729~ 50. 553nm. The relationship between opticalabsorptive power, photoluminescence and catalytic ability of nano ZnO is analyzed. The results indicate that the smaller of ZnO particles are, the better UV absorption of it is, the stronger photoluminescence and more vacancy oxygen on the sur face of nano ZnO are, the higher the photo catalytic ability of nano-ZnO occurs. Tentatively, catalytic mechanisms wf nano-ZnO reveale that lie in the small-size effect and quantum effect as well as abundant chemisorbed oxygen and structural deficiency on the surface of nano ZnO crystal particles.