纳米氧化锌的制备及光催化应用

Preparation and photocatalytic applications of nanometer zinc oxide

以硫酸锌和碳酸钠为原料,采用液相沉淀法制备了平均粒径为60 nm的氧化锌,通过正交试验得出制备纳米氧化锌的最佳工艺条件。用激光粒度分析、热重分析(TG-DTA)、X射线衍射分析(XRD)及扫描电子显微镜(SEM)等物理手段对纳米氧化锌的粒径分布、热性能、晶形结构及微观形貌进行表征。结果表明:产品颗粒大小均匀,分散性较好,平均粒径为60 nm,前驱体的煅烧温度为400℃,形貌呈球形或类球形。纳米氧化锌作光催化剂对酸性品红和甲基橙进行光催化的实验表明:纳米氧化锌的光催化能力较强,对酸性品红和甲基橙的降解率分别为98.75%和92.37%。

Zinc oxide （ZnO） with average particle size of 60 nm was prepared by liquid precipitation method with zinc sulfate and sodium carbonate as raw materials.The optimum technological conditions to prepare nanometer ZnO were obtained through orthogonal experiment.The particle size distribution, thermal performance, crystal shape structure, and micro-mor- phology were characterized by physical methods of laser particle size analysis, thermo-gravimetric analysis （TG-DTA）, X-ray diffraction analysis （XRD）, and scanning electron microscope （SEM）.Results showed that： the grain size of the products was well-distributed with good dispersivity, and the average particle size was 60 nm ;the precursor calcining temperature was 400℃ , morphology was spherical or spherical-like.Photocatalytic experiments were made with nanometer ZnO as photo- chemical catalyst, for degradation of acidic magenta and methyl orange, and results showed that： the photoeatalytic ability of nanometer ZnO was quite strong, and the degradation rates of acidic magenta and methyl orange were 98.75% and 92.37%, respectively.