Zn掺杂CuO/CuAl2O4复合空心球的制备及光催化性能

以葡萄糖为模板, 硝酸锌、硝酸铜和硝酸铝为原料, 采用水热法制备高比表面Zn-CuO/CuAl₂O₄复合空心球。采用XRD、SEM、HRTEM、BET、DRS和PL等手段对样品进行表征, 结果表明: 在600℃下焙烧的Zn-CuO/CuAl₂O₄复合物呈空心球状, 球体直径约为2 μm, 比表面积高达214.97 m²/g。引入Zn有助于提高样品对紫外和可见光的吸收能力, 减少光生电子空穴对的复合, 光催化活性显著提高。在模拟太阳光照下, 以甲基橙溶液为目标降解物, 考察样品的煅烧温度和Zn加入量对光催化活性的影响。当Zn加入量为0.5wt%, 煅烧温度为600℃时, 样品的光催化活性最佳。光照60 min, 0.5 g/L光催化剂用量对25 mg/L甲基橙溶液的脱色率高达97%。

Preparation and Photocatalytic Properties of Hollow Spheres-like Zn-doped CuO/CuAl2O4 Composite Photocatalysts

Zn-doped CuO/CuAl₂O₄ composite hollow spheres with high specific surface area were synthesized by hydrothermal method, using glucose as template and Zn(NO₃)₂·6H₂O, Cu(NO₃)₂·3H₂O, Al(NO₃)₃·9H₂O as raw materials. The samples were characterized by XRD, SEM, HRTEM, BET, DRS and PL spectra. The results showed that Zn- doped CuO/CuAl₂O₄ composites possessed hollow microspheres shape with specific surface area up to 214.97 m²/g and diameter of about 2 μm after calcined at 600℃. The Zn doped photocatalysts exhibited enhanced absorption intensity, decreased electron-hole recombination. Further photocatalytic activities of the samples were greatly increased. The influences of calcination temperature and Zn doping content on photocatalytic activities of the samples were investigated by measuring the degradation rate of methyl orange (MO) under simulated sunlight irradiation. The sample doped with 0.5wt% Zn which was calcined at 600℃ showed the highest efficiency. Under visible light irradiation for 60 min, the decolorizing efficiency of 25 mg/L MO by 0.5 g/L photocatalyst reached 97%.