Bi2S3/BiOCl复合光催化剂的水热合成及其高活性(英文)

Hydrothermal Synthesis and High Activity of Bi_2S_3/BiOCl Composite Photocatalysts

采用一种简便的水热法在433 K的温度下成功合成了具有不同Bi2S3质量分数的Bi2S3/BiOCl复合光催化剂,利用各种技术对其进行了表征。在紫外光照射下,以甲基橙水溶液的光催化降解为模型反应,评价了Bi2S3/BiOCl复合光催化剂的活性。研究结果表明:与纯Bi2S3和纯BiO Cl相比,Bi2S3/BiOCl样品明显具有更高的光催化性能,尤其当Bi2S3在Bi2S3/BiOCl中的质量分数为26.5%时,Bi2S3/BiOCl复合催化剂的光催化活性与商业P25(TiO 2)的活性非常接近,而这种商业P25在紫外光照射下是公认的高效光催化剂。这种明显提高的光催化活性主要归功于光生电子和空穴在Bi2S3和BiO Cl形成异质结界面上的有效转移,降低了电子-空穴对的复合。

Bi2S3/BiOCl composite photocatalysts with various mass fractions of Bi2S3 were successfully synthesized by a facile hydrothermal process at 433 K,characterized by various techniques,and evaluated by the photo-degradation of methyl orange( MO) in an aqueous solution under the irradiation of ultraviolet( UV) light. The results showed that the photocatalytic activity of Bi2S3/BiOCl catalysts was greatly enhanced,compared with that of pure Bi2S3 andBiOCl. Especially,the photocatalytic activity of the 26. 5% Bi2S3/BiOCl sample is very close to that of commercial Degussa P-25( TiO 2),which has been generally recognized as an efficient photocatalyst under UV light irradiation. The remarkably enhanced photocatalytic activity could be mainly attributed to the effective transfer of the photo-generated electrons and holes at the heterojunction interface of Bi2S3 andBiOCl,which reduced the recombination of electron-hole pairs.