铁改性丙纶无纺织物在偶氮染料降解中的应用

使用丙烯酸对丙纶无纺织物进行表面接枝改性反应,并将所得改性无纺织物与铁离子反应制备铁改性丙纶无纺织物,然后将其作为非均相Fenton催化剂应用于偶氮染料活性红195的氧化降解反应中;重点研究了催化剂中铁离子含量和可见光对其催化活性的影响,并使用紫外可见光光谱和COD分析对染料光催化降解过程进行了考察.结果表明:铁改性丙纶无纺织物能够显著地催化染料的氧化降解反应,铁离子含量的增加和可见光均能够提高其催化活性.紫外可见光光谱分析和COD分析表明:铁改性丙纶无纺织物不仅能够催化染料分子中偶氮键和芳香环结构的分解反应,而且能够使其进一步转化为无机物.此外,在铁改性丙纶无纺织物存在时活性红195的氧化降解反应可使用假一级反应动力学模型进行描述.

Application of Fe modified PP non-woven fabric on degradation of azo dye

Polypropylene(PP) non-woven fabric was grafted by acrylic acid to enable ligation of ferric ions to the fiber surface so as to produce a Fe modified PP non-woven fabric,and then the resulting fabric was used as heterogeneous Fenton catalyst for the oxidative degradation of an azo dye,Reactive Red 195.The effect of ferric ion content loading on catalyst and visible irradiation on the catalytic activity of the fabric was investigated,and the photocatalytic degradation of Reactive Red 195 was also examined by UV-Vis spectrometry and COD measurement.The results indicated that the modified PP non-woven fabric had a significant catalytic property on oxidative degradation of the dye,and enhancing ferric ion content and visible irradiation led to high decoloration level.UV-Vis spectrometry and COD analysis confirmed that the aromatic parts and conjugated structures of the dye were decomposed and gradually mineralized during its degradation.Additionally,the oxidative degradation of Reactive Red 195 in the presence of Fe modified PP non-woven fabric followed the pseudo-first order kinetics.