AgO/SiO_(2)复合纳米颗粒的可控制备及其光催化特性  

Controllable Preparation and Photocatalystic Properties of AgO/SiO_(2)Composite Nanoparticles

作　　者：王芳[1] 殷盼盼 郭猛 刘宇 杨婉箐 李承翰 黄雨 相文峰[2] Wang Fang;Yin Panpan;Guo Meng;Liu Yu;Yang Wanqing;Li Chenghan;Huang Yu;Xiang Wenfeng(College of Science,China University of Petroleum,Beijing 102249,China;College of New Energy and Materials,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)理学院,北京102249 [2]中国石油大学(北京)新能源与材料学院,北京102249

出　　处：《微纳电子技术》2023年第2期222-227,共6页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(62075245)。

摘　　要：以正硅酸乙酯(TEOS)和AgNO_(3)为前驱体,通过共溶胶双水解的方法制备出了AgO/SiO_(2)复合纳米颗粒。利用扫描电子显微镜、透射电子显微镜和能量色散X射线光谱仪探究了不同Ag离子浓度对复合纳米颗粒微结构的影响,并对相关影响机理进行了讨论,最后对其光催化性能进行了研究。结果表明:Ag离子浓度对复合纳米颗粒的结构及分散性有着决定性的影响。当Ag离子浓度较低时,基体SiO_(2)颗粒的球形度较好且分散性很好;负载的AgO纳米颗粒分布相对均匀且粒径在2~4 nm内。Ag离子浓度的增加使SiO_(2)颗粒的球形度逐渐变差,粒径逐渐减小,团聚效应增强,最后形成了不规则的块状团聚体;AgO纳米颗粒随着负载量逐渐增多,分布密度和粒径也逐渐增大,并且分散的纳米颗粒相互连接,由点状分布逐渐向面状分布转变。在可见光照射下,AgO/SiO_(2)复合纳米颗粒对罗丹明B(RhB)的降解率约为94.8%。实验结果表明,AgO/SiO_(2)复合纳米颗粒是一种有效的光催化剂,在光催化领域有着潜在的应用价值。AgO/SiO_(2)composite nanoparticles were prepared by co-solvent double hydrolysis using tetraethyl orthosilicate and AgNO_(3) as precursors.And the effects of different Ag ion concentrations on the microstructure of the composite nanoparticles were investigated using scanning electron microscope,transmission electron microscope and energy dispersive X-ray spectroscope,and the related synthesis mechanism was analyzed.Finally,the photocatalytic properties of the AgO/SiO_(2)composite nanoparticles were analyzed.The results show that the Ag ion concentration has a decisive influence on the structure and dispersibility of the composite nanoparticles.When the Ag ions concentration is low,the sphericity and dispersion of the matrix SiO_(2)particles are good,and the loaded AgO nanoparticles with the particle size in the range of 2-4 nm are relatively uniformly distributed.However,with the increase of the Ag ion concentration,the sphericity of SiO_(2)particles gradually deteriorates,their particle size decreases by degrees,the agglomeration effect increases,which induces the synthesized irregular blocky agglomerates;meanwhile,as the load gradually increases,the distribution density and particle size of AgO nanoparticles gradually increase,and the dispersed nanoparticles are connected with each other and gradually change from point distribution to plane distribution.The degradation rate of RhB by the AgO/SiO_(2)composite nanoparticles is about 94.8%under visible light irradiation.The experimental results show that AgO/SiO_(2)composite nanoparticles are an effective photocatalyst with potential applications in the field of photocatalysis.

关 键 词：复合纳米颗粒 AgO/SiO_(2) 复合材料 纳米材料 光催化 

分 类 号：TB33[一般工业技术—材料科学与工程] TB383