【摘要】 用偕胺肟改性聚丙烯腈(PAN)纤维与三氯化铁反应,在室温条件下制备了聚丙烯腈铁(Fe-PAN)配合物,并采用SEM,XRD和FT-IR等方法对其进行了表征.然后将其作为非均相光催化剂用于偶氮染料活性红MS的氧化降解反应,分别考察了催化剂用量、催化剂中铁离子含量(CFe-PAN)、pH值等因素对脱色率的影响,并应用紫外-可见光谱法对染料的氧化降解反应进行了分析.结果表明,改性PAN纤维中偕胺肟基团与铁离子发生了配位反应,增加PAN纤维中偕胺肟数或溶液中铁离子浓度能制备高铁离子含量的Fe-PAN催化剂.催化剂用量及铁离子含量增加都会促进活性红MS的降解反应.Fe-PAN催化剂在pH≤6.0的溶液中具有较高的催化活性,而在碱性介质中活性有所降低.在Fe-PAN催化剂存在下活性红MS的降解反应属于假一级动力学反应,催化剂用量和铁离子含量增加有利于提高活性红MS的降解反应速率常数。更多还原

【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.更多还原