Abstract: As the magnetic nuclear,CoFe₂O₄ nano-sized particles were prepared by chemical coprecipitation method at first.Through coating TiO₂ on the surface of magnetic CoFe₂O₄ by hydrolysis of TiOSO₄,a paramagnetic TiO₂/CoFe₂O₄ composite photocatalytic material that is easy for solid-liquid separation was prepared.Properties of sample were characterized by XRD,TEM,and VSM.Photocatalyst reactivity was evaluated by using methyl orange aqueous solution as simulated contaminants.Results indicated that the TiO₂/CoFe₂O₄ composite photocatalytic material had good crystal form and the TiO₂ and CoFe₂O₄ of the sample existed as anatase phase and spinel structure,respectively;diameter of the TiO₂/CoFe₂O₄ particles was at 40~50 nm and particles showed superparamagnetism;the TiO₂/CoFe₂O₄ composite photocatalytic material possessed high photocatalytic activity and reused performance.

Key words: TiOSO₄, magnetic, TiO₂/CoFe₂O₄, composite photocatalytic material