可见光活性的磁性Ce/Ti-SiO2-Fe3O4纳米材料的合成与其催化性能研究

Synthesis and Photocatalytic Performance of Ce/Ti-SiO_2-Fe_3O_4 Magnetic Visible-light-induced Composite Nano-photocatalyst

将Ti4+/Ce3+包覆组装在磁性二氧化硅纳米粒子上,制备了磁性复合Ce/Ti-SiO2-Fe3O4纳米粒子,用XRD、TEM、UV-Vis和IR等手段对样品进行了表征,以苯酚的光降解反应表征了其催化性能.研究发现复合纳米粒子磁响应性好,可见光区表现出很强的MMCT吸收,在阳光下照射9h,苯酚降解率达到91.4%.

Ce/Ti-SiO2-Fe3O4 magnetic nanoparticle composites are prepared by enwrapping Ti（Ⅳ） and Ce （Ⅲ） species on SiO2-Fe3O4 magnetic nanoparticles. The obtained magnetic nanoparticle compsites are characterized with XRD, TEM, UV-Vis and IR. The photoeatalytie performance of the materials are characterized by phenol degradation. The results showed that the is obtain nanoparticle materials are well responded to magnetic field. The magnetic composite obtained by treating Ti^4＋-SiO2-Fe3O4 nanomaterial with Ce（NO3）3 solution and calcination in air exhibits strong MMCT （metal-to-metal charge transfer） absorption.This material is highly capable to catalyze the photodegradation of phenol under visible light,the degradation ratio of phenol reaeheds 91.4%.