磁性TiO_2/CoFe_2O_4纳米复合光催化材料的制备  

Preparation of Magnetic TiO_2/CoFe_2O_4 Composite Photocatalytic Nanomaterial

作　　者：左显维[1,2] 费鹏[1] 胡常林[1] 苏碧桃[1] 雷自强[1] 

机构地区：[1]西北师范大学化学化工学院,省部共建生态环境相关高分子材料教育部重点实验室,甘肃省高分子材料重点实验室,兰州730070 [2]甘肃省科学院传感技术所,兰州730000

出　　处：《无机化学学报》2009年第7期1233-1237,共5页Chinese Journal of Inorganic Chemistry

基　　金：甘肃省自然科学基金(No.0710RJZA119)资助项目

摘　　要：以磁性CoFe2O4为核,采用改进的溶胶-凝胶法,制备了磁性TiO2/CoFe2O4纳米复合光催化材料。利用VSM(振动样品磁强计)技术对其磁性能进行了研究,结果表明:由该法所得的TiO2/CoFe2O4纳米复合光催化材料的饱和磁化强度虽稍弱于纯CoFe2O4纳米材料,但其矫顽力则优于CoFe2O4。TEM、XRD、UV-Vis等的结果表明,该纳米复合材料中的TiO2为锐钛矿结构;与TiO2相比,纳米复合材料对光的吸收拓展到了整个紫外-可见区,且吸收强度大大增强。对染料废水光催化降解的模拟研究表明,该复合材料在紫外光下,6h可以使亚甲基蓝染料溶液的脱色率达95%,且重复使用3次时染料溶液的脱色率仍能保持在90%,明显优于纯TiO2。A magnetic TiO2/CoFe2O4 composite nanomaterial was prepared by depositing TiO2 onto the surface of magnetic CoFe2O4 cores using an improved sol-gel coating technique. The phase structure, size and magnetic property of the composite particles were characterized by XRD, TEM and Vibrating Sample Magnetometer（VSM） analysis. The magnetic property of the composite material was slightly weaker than pure CoFe2O4 but the coercive force was better. The spectrum response was from UV to visible region and the absorbance intensity remarkably increased. The results of the photoeatalytic experiments indicated that under the sunlight, magnetic TiO2/CoFe2O4 composite nanomaterial showed fairly good reusability and higher decolorizing activity and catalytic stability than pure TiO2. For example, the decolorizing efficiency of Methylene Blue trihydrate（MB）solution reached 95% on the composite nanomaterial under the UV illumination when reaction time was 6 h and the efficiency could keep 90% when it was repeatedly used for 3 times.

关 键 词：TIO2 COFE2O4 磁性纳米复合光催化材料 制备 

分 类 号：O643[理学—物理化学] O614.41[理学—化学]