Li Cong-Ju, Wang Bin, Wang Jiao-Na
College of Material Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, PR China.
J Nanosci Nanotechnol. 2012 Mar;12(3):2522-8. doi: 10.1166/jnn.2012.5813.
A novel magnetic separable composite photocatalytic nanofiber consisting of TiO2 as the major phase, CeO(2-y) and CoFe2O4 as the dopant phase was prepared by sol-gel method and electrospinning technique, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectrum (UV-vis DRS) and vibrating sample magnetometer (VSM). The photocatalytic activity of the resultant CoFe2O4-TiO2 and CeO(2-y)/CoFe2O4-TiO2 nanofibers was evaluated by photodegradation of methylene blue (MB) in an aqueous solution under xenon lamp (the irradiation spectrum energy distribution is similar to sunlight) irradiation in a photochemical reactor. The results showed that the dopant of Ce could affect the absorbance ability and photo-response range. The sample containing 1.0 wt% CeO(2-y) exhibited the highest degradation with 35% for MB under simulate solar light irradiation. Furthermore, the as-synthesized composite photocatalytic nanofibers could be separated easily by an external magnetic field, thus it might hold potential for application in wastewater treatment.
通过溶胶 - 凝胶法和静电纺丝技术制备了一种新型的磁性可分离复合光催化纳米纤维，其主要相为TiO₂，掺杂相为CeO(2 - y)和CoFe₂O₄，并通过X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、紫外 - 可见漫反射光谱（UV - vis DRS）和振动样品磁强计（VSM）对其进行了表征。在光化学反应器中，通过氙灯（辐照光谱能量分布类似于太阳光）照射下亚甲基蓝（MB）在水溶液中的光降解来评估所得CoFe₂O₄ - TiO₂和CeO(2 - y)/CoFe₂O₄ - TiO₂纳米纤维的光催化活性。结果表明，Ce的掺杂会影响吸光能力和光响应范围。在模拟太阳光照射下，含有1.0 wt% CeO(2 - y)的样品对MB的降解率最高，为35%。此外，合成的复合光催化纳米纤维可以通过外部磁场轻松分离，因此在废水处理中可能具有应用潜力。
