静电纺丝制备TiO_2/PAN纳米纤维毡及其性能研究

Prep-aration and Photocatalysis of TiO_2 NanoparticleDoped in Electrospun Polyacrylonitrile Nanofiber Mats

采用超声波水解技术水解TiCl4制备纳米TiO2粒子,与聚丙烯腈(PAN)的N,N-二甲基甲酰胺(DMF)溶液共混后,通过静电纺丝制得具有光催化活性的TiO2/PAN纳米纤维毡,并用其对模拟废水中苯酚进行光催化降解实验。X射线衍射(XRD)表征结果显示制备的TiO2为锐钛矿。用场发射扫描电镜(FE-SEM)观察纤维毡的形态,显示纤维的直径随纺丝液浓度增大而增大。对苯酚进行光催化降解结果表明:纺丝液浓度质量分数为5%TiO2/PAN纤维毡对苯酚的降解率最高,对100 mg/L,50 mg/L和20 mg/L苯酚的降解率分别为51.1%,87.5%和99.6%。纤维毡循环使用5次后对于20 mg/L苯酚的降解率为87.4%。

Nanosized TiO2 was obtained by the hydrolysis of TiC14 under the irradiation of uhrasonication. The TiO2 nanoparticles were mixed with solution of polyacrylonitrile （ PAN ）/N, N - dimethyl - formamide （DMF） and then TiO2/PAN nanofiber mats were frabricated by electrospinning method. The TiO2/PAN nanofiber mats were used for photocatalytic degradation of phenol in simulation wastewater. The crystal type of Ti02 nanoparticles were characterized by X -ray diffraction（XRD）and the morphology of TiO2/PAN nanofibers were characterized by scanning electron microscope （SEM）. The result shows that crystal type of TiO2 was anatase phase in our work, and the diameter of TiO2/PAN nanofibers increased with increasing solution concentration. The 5wt% TiO2/PAN nanofiber mat had the highest degradation efficiency of phenol, the efficiency of the photocatalytic degradation of phenol were 51.1%, 87.5%, 99. 6% respectively for phenol concentration 100 mg/L, 50 mg/L, 20 mg/L. At 20 mg/L phenol concentration, the mat still kept its degradation efficiency of phenol 87.4% after 5 times reused.