水热法制备SiO_2@Ag果莓状复合微球及其催化性能研究

Synthesis of raspberry-like SiO_2@Ag nanohybrid spheres and their catalytic property

以聚乙烯吡咯烷酮(PVP)为还原剂和稳定剂,通过一步高温水热法,直接在SiO_2微球表面上沉积Ag纳米粒子,制备果莓状SiO_2@Ag纳米复合微球。采用TEM、XRD、UV-Vis和FT-IR对SiO_2@Ag纳米复合微球的形貌与结构等进行表征。以碱性有机染料罗丹明B(RhB)为降解物,NaBH_4为还原剂,研究了所制备的纳米复合微球在常温、可见光条件下的催化性能。结果表明:通过水热法可以有效地将Ag纳米粒子直接沉积到SiO_2微球表面,得到果莓状SiO_2@Ag纳米复合微球,其中Ag纳米粒子粒径为10nm左右。该纳米复合微球对有机染料RhB的降解具有很好催化效果,降解率为85.17%。

The raspberry-like SiO_2@Ag nanohybrid spheres were prepared by one-pot high temperature hydrothermal method,with PVP as reducing agent and stabilizer.The morphology and structure of as-prepared nanohybrid spheres were characterized by TEM,XRD,UV-Vis and FT-IR.Catalytic activity of the spheres at room temperature and under visible light conditions,was investigated by using basic organic dye Rhodamine B（RhB）as degradation product and NaBH_4 as reducing agent.It was experimentally demonstrated that the spheres were synthesized by a versatile method,the Ag NPs deposited directly on the surface of SiO_2 microspheres in one step,the size of Ag NPs was about 10 nm.Furthermore,the spheres had excellent catalytic properties for the degradation of RhB,the degradation rate was 85.17%.