多次交替浸渍法构筑簇状ZnO的PAN复合纳米纤维膜及其光催化性能

以聚丙烯腈（PAN）与氯化锌（ZnCl₂）作为前驱物，采用静电纺丝工艺制备PAN/ZnCl₂复合纳米纤维膜，分别采用多次冷热交替浸渍法和单次冷热静置浸渍法得到簇状PAN/ZnO-1和PAN/ZnO-2复合纳米纤维膜。利用扫描电镜（SEM）、傅里叶红外光谱（FT-IR）、X射线衍射（XRD）、X射线能量色散光谱（XPS）和热重分析仪（TG）对复合纳米纤维膜的表面形貌和微结构进行了表征，并以亚甲基蓝（MB）为污染物模型，评价其光催化降解性能。结果表明：经冷热交替浸渍后，纳米ZnO粒子均匀地附着在PAN纤维表面，尤其在PAN/ZnO-1复合纳米纤维膜表面还出现了花状ZnO粒子；相比单次冷热静置浸渍法处理的PAN/ZnO-2复合纳米纤维膜，经多次冷热交替浸渍的PAN/ZnO-1复合纳米纤维膜循环使用3次后对MB的降解率仍可达到90%以上，具有更好的光催化活性和循环使用性能。同时，MB溶液的初始质量浓度、催化剂用量和染料溶液的pH等因素对样品的的光催化降解率有一定影响。

Anchoring ZnO Clusters on PAN Nanofiber Membrane by Multiple Impregnation Method and Its Photocatalytic Performance

The polyacrylonitrile(PAN)/ZnCl₂ nanofiber membrane was prepared by electrospinning,which could act as precursors to fabricate different ZnO clusters of PAN/ZnO-1 and PAN/ZnO-2 nanofiber membranes by repeatedly alternating immersion method and single hot/cold impregnation method,respectively.The morphology and microstructure of the nanofiber membranes were characterized by utilizing Scanning Electron Microscope(SEM),Fourier Infrared spectrum(FT-IR),X-Ray Diffraction(XRD),X-ray energy dispersive spectroscopy(XPS),and Thermal Gravimetric analyzer(TG).Moreover,methylene blue (MB) was taken as a pollutant model to evaluate the photocatalytic degradation performance of the nanofiber membranes.Results indicated that nanoscaled ZnO clusters were anchored on the surface of PAN fiber by impregnation.Especially,flower-like ZnO particles emerged in the surface of PAN/ZnO-1 nanofibers membrane.And after three cycles,the degradation rate of PAN/ZnO-1 was more than 90%.It is indicated that photocatalytic activity and recycling performance of PAN/ZnO-1were better than those of PAN/ZnO-2.And such factors had influence on the degradation rate of the nanofiber membranes,such as the initial concentration of MB solution,the amount of catalyst and the pH value of dye solution.