Badr Y, Abd El-Wahed M G, Mahmoud M A
National Institute of Laser Enhanced Science, Cairo University, Cairo, Egypt.
J Hazard Mater. 2008 Jun 15;154(1-3):245-53. doi: 10.1016/j.jhazmat.2007.10.020. Epub 2007 Oct 13.
Silica nanoparticles (SiO2 NPs) were found to be photocatalytically active for degradation of methyl red dye (MR). The SiO2 NPs and SiO2 NPs doped with silver (and or) gold nanoparticles were prepared. From the transmission electron microscopy (TEM) images the particle size and particle morphology of catalysts were monitored. Moreover, SiO2 NPs doped with silver and gold ions were used as a photocatalyst for degradation of MR. The rate of photocatalytic degradation of MR was found to be increased in the order of SiO2 NPs, SiO2 NPs coated with gold nanoparticles (Au NPs) and silver nanoparticles (Ag NPs), SiO2 NPs coated with Ag NPs, SiO2 NPs coated with Au NPs, Ag+-doped SiO2 NPs, and Au3+-doped SiO2 NPs. The kinetic and mechanism of photocatalytic reaction were studied and accorded well with experimental results.
已发现二氧化硅纳米颗粒（SiO₂ NPs）对甲基红染料（MR）的降解具有光催化活性。制备了SiO₂ NPs以及掺杂有银（和/或）金纳米颗粒的SiO₂ NPs。通过透射电子显微镜（TEM）图像监测催化剂的粒径和颗粒形态。此外，掺杂有银离子和金离子的SiO₂ NPs被用作降解MR的光催化剂。发现MR的光催化降解速率按以下顺序增加：SiO₂ NPs、涂覆有金纳米颗粒（Au NPs）和银纳米颗粒（Ag NPs）的SiO₂ NPs、涂覆有Ag NPs的SiO₂ NPs、涂覆有Au NPs的SiO₂ NPs、Ag⁺掺杂的SiO₂ NPs和Au³⁺掺杂的SiO₂ NPs。研究了光催化反应的动力学和机理，其与实验结果吻合良好。
