Co、Ce共掺杂TiO_2-SiO_2/NiFe_2O_4磁性介孔微球的光催化性能

Photocatalytic Activity of Co-Ce Codoped TiO_2-SiO_2/NiFe_2O_4 Magnetic Mesoporous Microspheres

以NiF_2O_4纳米粒子作磁性载体、十二烷基磺酸钠和聚乙烯吡咯烷酮作模板剂、Co和Ce作掺杂离子、钛酸丁酯作钛源,制备得到(Co,Ce)-TiO_2-SiC_2/NiFe_2O_4磁性介孔微球。通过震动样品磁场计、SEM、紫外-可见漫反射吸收光谱、程序升温氧脱附等方法对磁性介孔微球的结构和光吸收性质进行了表征。(Co,Ce)-TiO_2-SiO_2/NiFe_2O_4是具有中空结构和超顺磁性的介孔微球,初始吸收边明显向可见光区域拓宽,增强了在可见光区域的吸收和表面吸附氧浓度。实验结果表明,(Co,Ce)-TiO_2-SiO_2/NiFe_2O_4能有效地将氦基甲酸酯类化合物光催化降解成无毒的的NH_4^+和NO_3^-无机产物等。

（Co-Ce）-TiO2-SiO2/NiFe2O4 magnetic mesoporous microspheres were prepared using nanoparticle NiFe2O4 as magnetic carrier, sodium dodecyl sulfonate and polyvinylpyrrolidone as templating agents, Co and Ce as doping ions and butyl titanate as titanium source. The structure and optical absorption property of the magnetic mesoporous microspheres were characterized by VSM, SEM, UV-Vis diffuse reflectance spectroscopy（DRS） and temperature programmed desorption of oxygen（TPD）. （Co-Ce）-TiO2- SiO2/NiFe2O4 is a kind of hollow superparamagnetic mesoporous microsphere. Its initial light absorption boundary is enlarged to the visible region, which can make the increasing of visible light absorption and the surface-adsorbed O2 concentration. The experimental results show that （Co-Ce）-TiO2-SiO2/NiFe2O4 can effectively photocatalytically degrade carbamate into nontoxic inorganic ions such as NH4＋and NO3-.