Synthesis of Ag-SiO_2 composite nanospheres and their catalytic activity

• 作 者: HAN QingYan LI GuiAn WANG DeXuan HE EnJie DONG Jun GAO Wei LI JunNa LIU TingZhuo ZHANG ZhongYue ZHENG HaiRong
• 机 构: School of Physics and Information Technology,Shaanxi Normal University,
• 出 处: Science China(Chemistry)
• 发表日期: 2014年06期
• 关键词: wastewater photoelectron helpful Figure silane avoiding aggregation uniformly sy

A simple,mild,and time-saving method is employed to synthesize Ag-SiO2 composite nanospheres with Ag nanoparticles uniformly distributed on the surface of SiO2 nanoparticles.The chemical elements and the morphology of Ag-SiO2 composite nanospheres were analyzed with transmission electron microscopy(TEM),X-ray power diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).On the surface of Ag-SiO2 composite nanospheres,silane coupling agent(KH-550)is introduced as an intermediary to connect the surfaces of SiO2 nanospheres and Ag nanoparticles,which is also helpful for avoiding the aggregation of Ag nanoparticles.It is found that Ag-SiO2 composite nanospheres have very good catalytic properties for the reduction of organic dyes,which may have potential application in wastewater treatment.

A simple, mild, and time-saving method is employed to synthesize Ag-SiO2 composite nanospheres with Ag nanoparticles uniformly distributed on the surface of SiO2 nanoparticles. The chemical elements and the morphology of Ag-SiO2 composite nanospheres were analyzed with transmission electron microscopy ( TEM), and X-ray photoelectron spectroscopy (XPS). On the surface of Ag-SiO2 composite nanospheres, silane coupling agent (KH-550) is introduced as an intermediary to connect the surfaces of SiO2 nanospheres and Ag nanoparticles, which are also helpful for avoiding the aggregation of Ag nanoparticles. It is found that Ag-SiO2 composite nanospheres have very good catalytic properties for the reduction of organic dyes, which may have potential application in wastewater treatment.