MS(M=Cd或Zn)纳米粒子负载TiO_2纳米线的制备及可见光催化性能

以具有层状结构的钛酸盐纳米线、CdCl2或ZnSO4及硫代乙酰胺为原料,采用两步水热合成法制备了高温稳定的六方相CdS或低温稳定的立方相ZnS纳米粒子负载的TiO2纳米线复合材料。首先,CdCl2或ZnSO4与钛酸盐纳米线在水热条件下进行离子交换制得含Cd2+或Zn2+的钛酸盐纳米线;然后,在硫代乙酰胺溶液中于160℃下直接处理含Cd2+或Zn2+的钛酸盐纳米线就可获得负载有硫化物纳米粒子的TiO2复合纳米线。它们在酸浸后,TiO2纳米线的表面仍存在少量硫化物纳米粒子。通过测试酸浸后样品、纯TiO2纳米线和商用P25对亚甲基蓝水溶液的可见光催化降解实验结果证实,含CdS纳米粒子样品的光催化活性最高。

Preparation and visible-light photocatalysis of MS(M=Cd or Zn) nanoparticle-supported TiO_2 nanowires

High-temperature-stable hexagonal CdS or low-temperature-stable cube ZnS nanoparticles supported anatase TiO2 nanowires were prepared using the precursors layered titanate nanowires,CdCl_2 or ZnSO_4 and thioacetamide by two-step hydrothermal synthesis process.Titanate nanowires with Cd~(2+) or Zn~(2+) cations were first obtained using layered titanate nanowires and CdCl_2 or ZnSO_4 under the hydrothermal condition;then,the products were treated in the diluted thioacetamide solution at 160℃ to prepare CdS- or ZnS-supported TiO_2 nanowires.After they were immersed into diluted HCl solution,the CdS or ZnS nanoparticles on TiO_2 nanowires could still be observed.The visible-light photocatalytic measurement results for the acid-treated samples,pure TiO_2 nanowires and commercial P25 demonstrate that the photocatalysis of TiO2 nanowires with CdS is the highest.