静电纺MnO_2/PAN纳米纤维膜的制备及其催化氧化甲醛性能

Preparation of electrospun MnO_2/PAN nanofibers and catalytic oxidation on formaldehyde

通过液相沉积法制备MnO2,以PAN/MnO2/N,N-二甲基甲酰胺溶液作为纺丝液进行静电纺丝制备MnO2/PAN纳米纤维膜。利用扫描电镜、透射电镜、傅里叶红外光谱、热重分析对纤维膜的结构和性能进行分析;并在甲醛废水体系中测试纤维膜催化氧化甲醛性能。结果表明:制备的纳米纤维其平均直径为196.46nm;随着MnO2质量分数的增大和纺丝电压的增加,纤维平均直径均下降;pH值为2,温度为60℃时,具有最佳的甲醛催化氧化性能;纤维吸收12h后,对甲醛去除率达到44.0%;MnO2/PAN纤维膜比MnO2粉末具有更好的催化氧化甲醛性能。

MnO2 was prepared by liquid phase deposition method, and PAN/MnO2/DMF was used as precursor and spun by electrospinning method. The structure and performance of nanofiber films were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and thermal gravimetric analysis. The catalytic oxidation performance of nanofibers was tested in formaldehyde wastewater system. The results show the average diameter of the prepared manganese dioxide is 196.46 nm. With increase of manganese dioxide content, the average fiber diameter decreases. With the rise of voltage, the average fiber diameter decreases. When pH is 2 and temperature is 60 ℃, catalytic oxidation performance is the best. After 12 h absorption, 44.0% formaldehyde is removed. Moreover, manganese dioxide fiber shows better catalytic oxidation performance of formaldehyde than manganese dioxide powder.