改性PAN非织造布铁配合物可见光降解甲醛气体

摘要

使用盐酸羟胺对聚丙烯腈非织造布(nPAN)进行了化学改性,并将所得改性聚丙烯腈非织造布(AO-nPAN)与Fe(Ⅲ)配位制得改性聚丙烯腈非织造布铁配合物(Fe-nPAN),分别使用扫描电镜(SEM)、傅立叶红外光谱(FTIR)、X射线衍射(XRD)和UV-Vis吸收光谱对Fe-nPAN进行了表征,然后将其作为光催化剂应用于甲醛气体的氧化降解反应中.结果表明:提高Fe(Ⅲ)初始浓度、反应温度和AO-nPAN的增重率都能够增加Fe-nPAN的Fe(Ⅲ)配合量.Fe-nPAN中偕胺肟基团与Fe(Ⅲ)发生了配位反应,使其在可见光区有明显的吸收带.增加Fe(Ⅲ)配合量和可见光强度都能够促进甲醛的降解反应,而且与PAN纱线制备的铁配合物催化剂相比,Fe-nPAN明显具有更高的催化活性.%Polyacrylonitrile nonwoven (nPAN) were chemically modified with hydroxylamine, and the obtained amidoximated polyacrylonitrile nonwoven (AO-nPAN) were coordinated with Fe (Ⅲ) to prepare modified nPAN supported Fe complexes (Fe-nPAN). The complexes were characterized using Scanning electron microscope (SEM), Fourier Transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and UV-vis absorption spectra, and then employed as photocatalysts in the oxidative degradation of formaldehyde. The results indicated that increasing Fe (Ⅲ) concentration, reaction temperature and weight gain rate of AO-nPAN led to higher Fe (Ⅲ) content of Fe-nPAN. The amidoxime groups were coordinated with Fe (Ⅲ) in Fe-nPAN, which gave the catalyst a remarkable absorption in the visible region. Increasing both Fe (Ⅲ) content of Fe-nPAN and visible irradiation could significantly accelerate the formaldehyde degradation, and the catalyst exhibited much higher photocatalytic activity than the PAN yarn Fe complex under similar conditions.