摘要：为获得颗粒尺寸、形貌等比较规则的纳米CdS颗粒,通过逐层自组装技术和"两步法"相结合的方法在介孔分子筛SBA-15孔道内制备CdS纳米粒子,首先应用带电聚合物聚二烯丙基二甲基氯化铵(PDDA)、聚苯乙烯磺酸钠(PSS)将SBA-15孔道表面功能化,然后引入CdS前驱体Cd(CH₃COO)₂·2H₂O,再将产物在H₂S气氛中硫化得到最终产物SBA-15-PDDA-PSS-CdS。采用X射线衍射、N₂吸附-脱附等手段进行测试表征,并将所制样品用于降解甲基橙来测试其光催化性能。结果表明:所制得的纳米CdS颗粒较小,分布均匀;纳米CdS在紫外光下对甲基橙具有良好的降解能力。

关键词： 逐层自组装;纳米复合粒子;光催化

Abstract： In order to prepare nanometer CdS particles with effectively controlled particle size and morphology， SAB-15 mesoporous silica was modified with CdS nano-particles on the inner pore surface by employing layer-by-layer self-assembly and “two-step method”. SBA-15 was firstly functionalized with charged polymers onto the inner pore surface through layer-by-layer self-assembly process. Then Cd(CH₃COO)₂·2H₂O which was the precursors of CdS were introduced into the functionalized pore surface of SBA-15， the products were further treated with H₂S to form CdS nano-particles on the inner pore surface of SBA -15. The samples were characterized by XRD、 nitrogen adsorption-desorption measurement. The results showed that the particle size and size distributing of CdS were more effectively controlled by the method， compared with traditional “directly grafting” synthetic methodology. The photocatalytic experiment showed that the samples exhibited an enhanced photo-catalytic activity for degradation of Methyl Orange solution. 

Keywords： layer-by-layer self-assembly； composite nano-particles； photo catalysis