Abstract:

ZnO-Bi₂O₃ ternary composite oxide has been prepared through thermal decomposition of molecular precursor Zn[Biedta]₂·8H₂O(edta=ethylenediaminetetraacetate). The effects of ignition time explored by X-ray powder diffraction,FT-IR spectra and UV-Vis diffuse reflectance spectroscopy on the structure and characteristics of the composite oxide are discussed. Taking the photo-degradation of methyl orange(MO) as the model,the effects of ignition time on the catalytic performance of composite are studied. The results show that ignition time has effects on the phase,absorbency,catalytic effectiveness,etc. of ZnO-Bi₂O₃ composite. The prepared composite has catalytic capacity for MO photo-degradation to different degrees. The catalytic effect of the prepared composite is the best when the ignition time is two hours. In neutral environment,as far as 20 mg/L of methyl orange is concerned,the optimum amount of photocatalyst is 2 g/L and the decoloration rate can reach 90% under a 3-hour irradiaton.

Key words: composite oxide, zinc, bismuth, photocatalytic activity, MO

摘要：

通过分子前驱体Zn[Biedta]₂·8H₂O热分解得到Zn-Bi-O三元复合氧化物,采用XRD、漫反射光谱、FT-IR等方法探索灼烧时间对复合氧化物的结构和性质的影响。同时以甲基橙的光降解为模型研究了灼烧时间对复合物催化性能的影响。结果表明,灼烧时间对复合物物相、吸光度、催化效果等均存在影响。制备的复合物对甲基橙光降解均具有不同程度的催化能力,其中灼烧2 h所得复合物的催化效果最好,在中性环境中,对20 mg/L的甲基橙而言添加量2 g/L为最佳,光照3 h的褪色率达90%。

关键词: 复合氧化物, 锌, 铋, 光催化性, 甲基橙

CLC Number: 

• X703.1