采用化学共沉淀?超声辅助法，制备出磁性纳米材料 Fe3 O4，利用溶胶?凝胶法在 Fe3 O4表面包裹Ce／TiO2，得到磁性复合材料Ce／TiO2／Fe3 O4．用XRD、SEM、BET等对其结构和性能进行了表征，催化剂主要以催化活性较高的锐钛矿相存在，Ce／TiO2包覆在纳米Fe3 O4的表面形成多孔结构，复合材料具有Langmuir Ⅳ吸附?脱附等温线，比表面积76．68 m2·g－1，平均孔径8 nm，主要分布在4．5—15．4 nm之间．通过电助光催化降解藏红T溶液研究了Ce／TiO2／Fe3 O4的光电催化活性．在催化剂的加入量为6 g·L－1，降解时间为60 min，外加电压为5 V，50 mg·L－1的藏红T溶液的降解率可达到90％以上，COD去除率达84．7％．所制备的Ce／TiO2／Fe3 O4在重复使用5次后仍能保持较好的光电催化活性．
Fe3 O4 magnetic nanoparticles were prepared by a combined chemical co?precipitation with ultrasonic treatment method. Ce/TiO2 was subsequently deposited on the surface of Fe3 O4 nanoparticles via sol?gel method. The synthesized samples were characterized by X?ray diffraction ( XRD ) , field?emission scanning electron microscopy ( FESEM ) , N2 adsorption?desorption techniques. The results showed that TiO2 mainly existed in anatase?type strucuture with high catalytic activity,and it was coated on the surface of Fe3 O4 nanoparticles with porous structures. The N2 adsorption?desorption isotherms were characteristic of a typical Langmuir Ⅳ isotherm. The catalyst had a homogenous pore?size distribution with an average pore?size of 8. 0 nm and a high specific surface area of 76. 68 m2·g-1. The catalytic activity of Ce/TiO2/Fe3O4 was investigated by photoelectrocatalytic degradation of safranine T solution. Under the condition of 6 g·L-1 catalyst, 50 min degradation time, 5 V voltage, the degradation rate of safranine T solution reached 90%, and the removal rate of COD was 84. 7%. The photoelectrochemical catalytic activity of Ce/TiO2/Fe3 O4 remained high after 5 times of reuse.
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