纳米CdS在Al-MCM-41分子筛孔道内的受限合成

Confined Formation of CdS Nanoparticles within the Pore of Al-MCM-41 Molecular Sieve

采用离子交换-沉积法,在Al-MCM-41介孔分子筛孔道内制备了纳米CdS,采用XRD、UV-Vis,FT-IR和SEM对产物进行了表征。考察了Cd2+交换次数、硫化反应时间以及焙烧温度对纳米CdS结构和光催化制氢性能的影响。结果表明,当Cd2+交换次数为2次、硫化反应时间为2h、焙烧温度为650℃,在Al-MCM-41介孔分子筛孔道内形成的纳米CdS为六方晶型结构,光催化制氢性能最佳,产氢速率可达43.96mmol/(h·gcat.(CdS)),是体相CdS产氢速率的9.31倍。

CdS nano-particles has been synthesized within the pore of Al-MCM-41 molecular sieve by the ion-exchange-precipitation method and characterized by XRD, UV-Vis diffuse reflectance spectrum, FT- IR and SEM. The influences of Cd^2＋ exchange times （n）, sulfuration reaction time（τ） and calcination temperature（T） on the structure of CdS nano-particles and their properties of photocatalytic hydrogen production were investigated. The results indicated that CdS nano-particles prepared under the condition of n of 2, τ- of 2 h and T of 650 ℃, exhibits the hexagonal phase crystalline structure and reaches the highest hydrogen evolution rate of 43.96 mmol/ h.g cat. （cds） ） which is 9.31 times as high as that of bulk phase CdS.