关键词: 改性聚丙烯腈纤维, 铁离子, 非均相光催化剂, 偶氮染料, 降解

Abstract: A modified Fe-polyacrylonitrile fibrous photocatalyst (Fe-PAN) was prepared by a reaction between PAN fibers containing amidoxime group and ferric chloride at room temperature and characterized using SEM, XRD and FT-IR techniques, and then used as a heterogeneous catalyst for the photocatalytic degradation of Reactive Red MS in water. Some factors affecting the degradation of Reactive Red MS such as catalyst dosage, catalyst loading (CFe-PAN) and solution pH were investigated with respect to the decoloration rate. Additionally, the photocatalytic degradation of Reactive Red MS was examined by UV-Vis spectrometry. The results indicated that amidoxime groups from PAN fibers were able to ligate ferric ions in solution, and increasing amidoxime groups or ferric ion concentration led to the high CFe-PAN catalysts. Moreover, increasing catalyst dosage and CFe-PAN significantly accelerated the dye degradation. Fe-PAN catalyst showed high photocatalytic activity at pH≤6.0 solution, however, its activity was reduced insignificantly at alkaline medium. Photocatalytic degradation of Reactive Red MS in the presence of Fe-PAN catalyst followed the pseudo-first order kinetics, and increasing catalyst dosage and CFe-PAN also enhanced the degradation rate constant.

Key words: modified PAN fiber, ferric ion, heterogeneous photocatalyst, azo dye, degradation