金属铈掺杂Bi2O3可见光催化剂的制备

Preparation of Ce-doped Bi2O3 photocatalysts

摘要:

本文以硝酸铋、硝酸铈铵为原料，氨水为沉淀剂，通过共沉淀工艺制备Ce4+掺杂Bi2O3光催化剂。采用XRD、SEM和TEM等手段分析了不同Ce4+/Bi3+比光催化剂的相组成和微观形貌。结果表明所制备的Bi2O3和Ce4+掺杂Bi2O3的相组成均为α-Bi2O3相，颗粒尺寸控制在50nm左右。利用甲基橙作为降解底物，考察了纳米Bi2O3和Ce4+掺杂Bi2O3光催化剂的可见光催化性能以及体系pH值对其光降解性的影响。结果表明，随着Ce4+掺入量的增加，Bi2O3的光催化性能随之增强，当Ce4+/Bi3+比为20:80时，降解率为98%，且在弱酸性环境中，其光降解性能最好。

Abstract:

Using bismuth nitrate and cerous ammonium nitrate as raw materials, aqueous ammonia as precipitator, pure and cerium-doped bismuth oxide photocatalysts were prepared through coprecipitation process. The phase composition and microstructure were investigated by XRD, SEM and TEM. The results showed that the pure and cerium-doped bismuth oxide photocatalysts were α-Bi2O3 and the sizes were all around 50 nm. Under the irradiation of visible light, the photocatalytic properties of samples were investigated by using degradation of Orange Ⅱ as the simulative reaction．The results showed that the photocatalytic degradation efficiency increased with the increasing of Ce4+ introduction. The photocatalyst with Ce4+/Bi3+ ratio of 20:80 performed 98% degradation efficiency. In addation, weak acid environment showed a better degradation efficiency.