以聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段共聚物(P123)为结构导向剂,钛酸丁酯(TBOT)为钛源,SiO_2/NiFe_2O_4为核,制备了具有多孔结构可磁分离的TiO_2/SiO_2/NiFe_2O_4光催化剂.采用N_2吸附-脱附、TEM、HRTEM、SEM、XRD和VSM等手段对样品进行分析表征.样品颗粒呈球形,分布均匀,平均粒径约为40nm,具备良好的磁分离性能.以硝基苯为模拟物测定其光催化活性,UV光照条件下,240min内硝基苯污染物降解完全,表明该光催化剂具有良好的光催化活性.
Magnetic separable TiO_2/SiO_2/NiFe_2O_4 particles were synthesized by using P123 as direction agent and TBOT as the source of titanium dioxide.The samples were characterized with X-ray diffraction (XRD),transmission electron microscopy (TEM),high resolution transmission electron microscopy (HRTEM),scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM).The results showed that the coating composite are sphere and has an even distribution,and the average size was about 40nm in diameter.The prepared samples have potential applications for cleaning polluted water with the help of magnetic separation.The photocatalytic activity of the composite particles was investigated for degradation of nitrobenzene by UV illumination.Experimental results show that the nitrobenzene pollutant can be completely degraded within 240min,which showed it has excellent photo-catalytic property.
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