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利用改进的Stber法在银核表面包覆一层SiO2,制备核-壳结构Ag@SiO2,然后以钛酸丁酯为钛源,采用溶胶-凝胶法制备出Ag@SiO2/TiO2复合光催化剂。应用XRD、TEM,UV-Vis和荧光光谱仪对样品进行表征。以亚甲基蓝作为降解模型化合物,研究所制备Ag@SiO2/TiO2复合材料的光催化性能。结果表明,由于贵金属Ag的存在,大大提高了TiO2的光催化效率;而Ag@SiO2结构,使得Ag的等离子共振峰明显向长波方向移动,与TiO2复合后,拓宽了TiO2的光谱响应范围,从而提高对可见光的利用率。
The modified Stöber method was used to coat the surface of silver with a layer of SiO2 to prepare Ag @ SiO2 with core-shell structure. Then Ag @ SiO2 / TiO2 composite was prepared by sol-gel method using titanium tetrabutyl titanate as titanium source catalyst of light. The samples were characterized by XRD, TEM, UV-Vis and fluorescence spectroscopy. The photocatalytic activity of Ag @ SiO2 / TiO2 composite was studied by using methylene blue as degradation model compound. The results show that due to the presence of noble metal Ag, the photocatalytic efficiency of TiO2 is greatly enhanced. However, the Ag @ SiO2 structure causes the plasmon resonance peak of Ag to move to the longwave direction obviously. After complexed with TiO2, the spectral response range of TiO2 is broadened. Improve the utilization of visible light.