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采用一步法水热还原AgNO_3制备出Ag@C核壳结构,并利用其作为模板沉积包覆上SiO_2、TiO_2层,煅烧后制备出载Ag的SiO_2@TiO_2空心球材料。利用XRD、TEM、SEM以及UV-Vis光谱对制备的样品进行表征,并研究了紫外光下对亚甲基蓝溶液的光催化降解性能。结果表明,制备的Ag核SiO_2@TiO_2空心球材料Ag核尺寸为80nm,空心夹层直径在250nm左右,这样的结构可以有效增大比表面积,而且Ag的表面等离子共振可以有效增强样品在紫外区域的吸收,使其对亚甲基蓝的光催化活性得到明显提高,120min内可达84%。
The Ag @ C core-shell structure was prepared by one-step hydrothermal reduction of AgNO_3. The SiO_2 @ TiO_2 hollow-sphere material was prepared by depositing SiO_2 and TiO_2 layers as a template and calcining. The prepared samples were characterized by XRD, TEM, SEM and UV-Vis spectra. The photocatalytic degradation of methylene blue solution under ultraviolet light was also studied. The results show that the prepared Ag core SiO_2 @ TiO_2 hollow spheres have an Ag core size of 80 nm and a hollow interlayer diameter of about 250 nm. Such a structure can effectively increase the specific surface area, and surface plasmon resonance of Ag can effectively enhance the UV- Absorption, so that the photocatalytic activity of methylene blue has been significantly improved, up to 84% within 120min.