Bi_2GeO_5纳米棒的制备及其光催化性能

Preparation of Bi_2GeO_5 Nanorods and Their Photocatalytic Properties

以硝酸铋和二氧化锗为原料、甘油和乙醇为溶剂,在不加表面活性剂条件下,通过液相反应和煅烧制备Bi_2GeO_5纳米棒,对其物相、形貌进行了表征,分析了其形成机理;以其为催化剂光催化降解罗丹明B(Rh B).结果表明,所制为纯Bi_2GeO_5材料,具有均一的棒状形貌和良好稳定的光催化活性.随Bi_2GeO_5浓度增加,其催化降解Rh B效果先显著提高后降低,Bi_2GeO_5浓度为1.5 g/L、光照150 min时光降解率最高,达90.4%.水热过程中铋离子与乙二醇形成的配合物自组装成纳米棒状结构,与溶液中游离的锗酸根离子发生离子置换反应,形成Bi_2GeO_5纳米棒材料.

Pure Bi2GeO5nanorods were prepared in a liquid phase reaction followed by calcination of the precursor with a mixture of glycerol and ethanol as solvent and Bi（NO3）·5H2O and Ge O2 as raw materials, and their phase and microstructure characterized. The prepared Bi2GeO5nanorods were used in photocatalytic degradation of Rhodamine B（Rh B）. The result showed that the prepared Bi2GeO5had a uniform rod shape and good stable photocatalytic activity. With the increase of concentration of Bi2GeO5nanorods, their degradation effect firstly increased markedly, and then decreased. Their highest photodegradation rate reached 90.4% when their concentration was 1.5 g/L and the illumination time 150 min. Meanwhile, the formation mechanism of Bi2GeO5nanorods was also analyzed as followed： in the hydrothermal process, first of all, the complexes with bismuth ions and ethylene glycol were self-assembly transformed into nanorod structure, and then the ion exchange reaction happened between the free germanium acid radical ions in the solution and the complexes with nanorod structure, and the Bi2GeO5nanorods formed.