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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%。
Polyvinylpyrrolidone (PVP) was used as reductant and stabilizer to deposit Ag nanoclusters on the surface of SiO 2 microspheres through one-step high temperature hydrothermal method to prepare fructus-shaped SiO_2 @ Ag nanocomposite microspheres. The morphology and structure of SiO_2 @ Ag nanocomposite microspheres were characterized by TEM, XRD, UV-Vis and FT-IR. The catalytic performance of the prepared nanocomposite microspheres under ambient temperature and visible light conditions was studied with RhB as the degradation product and NaBH4 as the reductant. The results show that Ag nanoparticles can be directly deposited on the surface of SiO 2 microspheres by hydrothermal method, and the berry-like SiO 2 @ Ag nanocomposite microspheres can be obtained. The size of Ag nanoparticle is about 10 nm. The nanocomposite microspheres have a good catalytic effect on the degradation of organic dye RhB with a degradation rate of 85.17%.