摘要
采用化学共沉淀-超声辅助法,制备出磁性纳米材料Fe3O4,利用溶胶-凝胶法在Fe3O4表面包裹Ce/TiO2,得到磁性复合材料Ce/TiO2/Fe3O4.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Fe3O4的表面形成多孔结构,复合材料具有LangmuirⅣ吸附-脱附等温线,比表面积76.68m2·g-1,平均孔径8nm,主要分布在4.5—15.4nm之间.通过电助光催化降解藏红T溶液研究了Ce/TiO2/Fe3O4的光电催化活性.在催化剂的加入量为6g·L-1,降解时间为60min,外加电压为5V,50mg·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/Fe3O4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 m^2·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.
出处
《环境化学》
CAS
CSCD
北大核心
2015年第5期995-1001,共7页
Environmental Chemistry
基金
常熟市科技局项目(cs201110)
江苏省大学生实践创新训练计划项目资助
关键词
铈
掺杂
二氧化钛
四氧化三铁
粒子电极
光电催化
cerium
doping
titanium dioxide
ferroferric oxide
particle electrode
photoelectrochemical catalytic degradation
