Au掺杂水热均匀沉淀高温制备TiO_2的光催化性能

向水热均匀沉淀、800℃焙烧制得的高活性、易分离TiO2(TiO2-800)中掺杂金(Au),以光催化降解活性艳红染料X-3B作为模型反应,考察了掺Au量、制备条件、Au的价态等对Au/TiO2-800光催化性能的影响。结果表明,氨水作为沉淀剂,200℃焙烧的0.5%Au/TiO2-800的光催活性较TiO2-800有较大提高,染料X-3B的降解率由93%提高到了100%。还原实验显示,0.5%Au/TiO2-800表面存在的离子态Au能有效提高TiO2-800光催化活性。

Catalytic performance of Au-doped TiO_2 prepared by hydrothermal homogeneous precipitation and calcination at high temperature

Au-doped TiO2 obtained by hydrothermal homogeneous precipitation and calcination at 800 ℃(i.e.Au/TiO2-800) was prepared.The photocatalytic degradation of reactive brilliant red X-3B in aqueous solution was used as a model reaction to evaluate the photocatalytic performance of the Au/TiO2-800.The influence of Au doping amount,reaction conditions and Au valence on photocatalytic performance of the Au/TiO2-800 was investigated.Results showed that the 0.5%Au/TiO2-800 prepared with ammonia as precipitant and calcination at 200 ℃ exhibited higher photocatalytic activity than the TiO2-800.Photocatalytic degradation rate of X-3B over the as-prepared 0.5%Au/TiO2-800 increased from 93% to 97%.Reduction experiment of the 0.5%Au/TiO2-800 showed Au ions on the 0.5%Au/TiO2-800 can be beneficial to improve its photocatalytic activity.