铁改性聚丙烯腈纳微米纤维催化剂在偶氮染料降解中的应用

利用静电纺丝法制备聚丙烯腈（PAN）纳米纤维，应用偕胺肟改性PAN纳米纤维（AO-n-PAN）与FeCl3反应得到PAN纳米纤维铁配合物（Fe-AO-n-PAN），并使用SEM和FTIR对其进行表征。最后将Fe-AO-n-PAN作为非均相光催化剂应用于偶氮染料C.I.活性红195（RR 195）的氧化降解反应中；考察催化剂中铁离子含量（QFe-PAN），辐射光强度和H2O2初始浓度等因素对其催化活性的影响，并使用紫外可见光谱和总有机碳（TOC）对染料的氧化降解反应进行分析。结果表明：AO-n-PAN中的偕胺肟基团与铁离子发生配位反应，增加AO-n-PAN中的偕胺肟基团数目能制备出高QFe-PAN的Fe-AO-n-PAN。Fe-AO-n-PAN中QFe-PAN的增加和辐射光强度的增大都可以显著提高RR 195的降解速率，当H2O2为3.0 mmol/L时Fe-AO-n-PAN催化活性较高。Fe-AO-n-PAN不仅对染料分子中的偶氮键和芳香环结构具有催化作用，而且还能够使其转化为无机物。

Application of Fe modified PAN nano-micron fiber catalyst to degradation of azo dye

Polyacrylonitrile (PAN) nanofibers were fabricated via electrospinning technique, and the modified Fe-polyacrylonitrile nanofibers photocatalysts(Fe-AO-n-PAN) were prepared by a reaction between PAN nanofibers (AO-n-PAN) containing amidoxime group and ferric chloride and characterized using SEM and FTIR techniques. Finally, Fe-AO-n-PAN were used as heterogeneous catalysts for the oxidative degradation reaction of Reactive Red 195(RR 195) in water. Some factors affecting the degradation of azo dye such as catalyst loading (QFe-PAN), irradiation intensity, and H2O2 initial concentration were investigated with respect to the decoloration percentage. Additionally, the oxidative degradation of azo dye was examined by UV-Vis spectrum method and total organic carbon (TOC) measurement. The results indicated that amidoxime groups of AO-PAN were able to ligate ferric ions in solution, and increasing amidoxime groups led to the high QFe-PAN catalysts. Moreover, increasing QFe-PAN and enhancing irradiation led to high degradation rate. Fe-AO-n-PAN showed high photocatalytic activity in the solution when the initial concentration of H2O2 is at 3.0 mmol/L. UV-Vis spectrometry and TOC analysis demonstrated that the aromatic parts and conjugated structures of the dye were decomposed and gradually mineralized during its degradation under the photocatalysis of Fe-AO-n-PAN.