摘要：以改性Fe₃O₄颗粒为核,采用溶胶-凝胶法在Fe₃O₄核表面包覆SiO₂壳层,并在SiO₂孔道内负载纳米TiO₂颗粒,得到易于固-液分离、平均直径为90~150 nm的具有核壳结构的Fe₃O₄-TiO₂-MCM-41光催化剂复合颗粒,采用透射电镜、X射线衍射、X射线光电子能谱等手段对样品进行表征,并对该催化剂的光催化性能进行测试。结果表明:所制备的磁性分子筛催化剂在紫外光下对苯酚的降解率达94.12%,对重金属离子Cr⁶⁺的吸附能达到95.05%。

关键词： 磁性分子筛；光催化；降解；吸附

Abstract：The nano-sized modified Fe₃O₄ particles were used as cores and SiO₂ layers were coated on their surface， then TiO₂ nano-particles were deposited in the pores by sol-gel process， the magnetic Fe₃O₄-TiO₂-MCM-41composite nano-particles with core -shell structure in size between 90~150 nm were successfully prepared. The products were characterized by TEM、XRD、 XPS， etc. The photodegradation phenol and absorption Cr （Ⅵ） from water with the magnetic nano- particles were carried out. The results showed that the as-synthesized magnetic nano-particles had high photocatalytic degradation （94.12%） for organic substances and absorption capabilities （95.05%） for heavy metal ions. 

Keywords：magnetic molecular sieve； photocatalytic； degradation； adsorption