改性PAN纤维负载hemin催化降解染料的研究

Study of Catalytic Degradation Dyes with Modified PAN Fiber Loaded Hemin

使用含有偕胺肟基团的改性聚丙烯腈(PAN)纤维作为载体材料,通过轴向配位作用负载氯化血红素(hemin)制备了非均相催化剂hemin-PAN,重点对其在有机染料氧化降解反应中的催化性能进行研究。结果表明,hemin-PAN能够通过活化H2O2催化染料的氧化降解反应,其催化活性与纤维中偕胺肟基团数量密切相关,PAN增重率为14.9%时,hemin-PAN有最高的催化活性;增加催化剂hemin负载量或提高反应温度都有利于染料的氧化降解反应,hemin-PAN(增重率为14.9%,hemin负载量为0.026 mmol/g)催化罗丹明B染料氧化降解反应的活化能为63.83 k J/mol。

A kind of heterogeneous catalyst （hemin-PAN） was synthesized by supporting hemin onto the amidoximated polyacrylonitrile （PAN） fiber through axial coordination bonds, and its catalytic performance for the oxidative degradation of organic dyes was investigated. The results show that hemin-PAN could effectively catalyze the oxida-tive degradation of dyes by H202 activation, and its catalytic activity was greatly affected by the amount of amidoxime groups, and when PAN weight gain rate is 14.9%, hemin-PAN has the highest catalytic activity. In addition, increasing hemin content of the catalyst and enhancing the reaction temperature can facilitate the dye degradation, and the activation energy of the Rhodamine B degradation catalyzed by hemin-PAN （14.9% of weight gain rate and 0.026 of mmolg-1 hemin content） is 63.83 kJ·mol-1.