Preparation and photocatalytic property of anatase TiO₂ / MnFe₂O₄core-shell structure nanoparticles

The anatase TiO₂ / MnFe₂O₄ composite nanoparticles with a core-shell structure have been obtained. Thecore MnFe₂O₄ nanoparticles were synthesized by the co-precipitation method , and the shell TiO₂ nanocrystals werederived using the sol-gel technology followed by a heat-t reatment at 450 ℃. The TiO₂ / MnFe₂O₄ samples were characterized by X-ray diff raction (XRD) and t ransmission elect ron microscopy ( TEM) . The TiO₂ / MnFe₂O₄ compositeparticles can be used as a magnetic photocatalyst , which can be fluidized and recovered by an applied magnetic fieldenhancing both the separation and mixing efficiency for recyclable fluids. When the mass f raction of TiO₂ is 30 % andthere is enough UV illumination (4 h in our experiment s) , the photodegradation ratio of Rhodamine B by the composite of TiO₂ / MnFe₂O₄ is 100 % , similar to that of the pure TiO₂ .