TiO2/CuS异质结的制备及光催化降解染料废水的研究

以原位沉淀法和水热法混合的合成手段,制备了TiO_2/CuS异质结光催化剂。这种异质结改善了单一TiO_2半导体光催化剂的缺陷,明显提高了太阳光下光催化降解甲基橙的效率。TiO_2与CuS之间形成的异质结结构和合适的能带结构能够扩展材料对太阳光谱的响应范围并且很好地收集和传输光诱导载流子,从而提高了载流子的分离效率,最终使半导体的光催化活性明显增强。结果表明,太阳光照射25min后,相比于TiO_2/MnS、TiO_2/CdS和TiO_2/ZnS异质结,TiO_2/CuS异质结(TiO_2和CuS的摩尔比为3∶1)对甲基橙的降解效果最佳,降解效率能达到97.3%。为提高半导体的光催化活性提供了一条可行的路径。

Preparation of TiO2/CuS heterojunction and study on photocatalytic degradation of dye wastewater

In this study, a TiO2/CuS heterojunction photocatalyst was prepared by a combination of in-situ precipitation and hydrothermal methods. This heterojunction improves the defects of a single TiO2 semiconductor photocatalyst and significantly improves the efficiency of photocatalytic degradation of methyl orange under sunlight. The heterojunction structure and suitable band structure formed between TiO2 and CuS can extend the response range of the material to the solar spectrum and collect and transmit light-induced carriers well, thereby improving the carrier separation efficiency. The photocatalytic activity of the semiconductor is significantly enhanced. After 25 minutes of sunlight exposure, compared with TiO2/MnS, TiO2/CdS and TiO2/ZnS heterojunctions, the TiO2/CuS heterojunction (the molar ratio of TiO2 and CuS is 3:1) has the best degradation effect on methyl orange, and the degradation efficiency can reach 97.3%.