摘要
采用水热法在SiO_2纳米微球表面修饰Ag纳米颗粒,制备二元SiO_2/Ag复合微球(SiO_2/Ag CMs)。通过改变AgNO_3用量,调控Ag纳米颗粒的尺寸及分布,并利用透射电子显微镜、X射线衍射等技术探究产物的表面形貌、微观结构及组成。相比于单分散性的SiO_2微球和Ag纳米颗粒,SiO_2/Ag CMs的光吸收峰发生明显红移,且具有较宽的SPR光吸收范围。以亚甲基蓝(MB)为有机染料模型,研究SiO_2/Ag CMs对MB的光催化降解性能,结果表明:SiO_2/Ag CMs光催化剂催化性能优于SiO_2纳米微球及Ag纳米颗粒;当AgNO_3用量为0.10g时所制备的SiO_2/Ag CMs表现出较为优异的光催化活性,且在可见光照射80min时其催化效率达到97.7%。
Ag nano-particles were modified on the surface of SiO2 nanospheres by hydrothermal method to prepare binary SiO2/Ag composite microspheres（SiO2/Ag CMs）in this paper.The size and distribution of Ag nanoparticles were controlled by changing the amount of AgNO3,and the morphology,microstructure and components of the as-prepared SiO2/Ag composite microsphere were investigated by transmission electron microscopy and X-ray diffraction technology.The light absorption peak of SiO2/Ag CMs shows significant red shift and has relatively broad SPR absorption scope,compared with the individually dispersed SiO2 and Ag nanoparticles.Photocatalytic degradation property of SiO2/Ag CMs on methylene blue（MB）was investigated by using MB as the organic dyestuff model.The results indicate that the catalytic performance of SiO2/Ag CMs photocatalyst is better than that of SiO2 nanospheres and Ag nanoparticles.When the AgNO3 dosage is 0.10 g,the photocatalytic efficiency of SiO2/Ag CMs is excellent,and the photocatalytic efficiency can reach 97.7% when the irradiation time of visible light is 80 min.
出处
《浙江理工大学学报（自然科学版）》
2017年第6期810-816,共7页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
