Abstract:

A modified PAN fiber-Fe (III) complex (Fe-AO-PAN) was prepared by a coordinated reaction between amidoximated PAN fiber and ferric chloride solution, and then used as a heterogeneous Fenton catalyst for the degradation of azo dyes with different structures. The relationship between Fe-AO-PAN dosage (M), ferric content of Fe-AO-PAN, decolorization rate (D), and initial degradation rate constant (k) of the dyes in the dark was investigated. Moreover, degradation process of the dyes and the effect of inorganic salt on degradation were also studied. The results indicated that the oxidative degradation of the azo dyes in water could be catalyzed effectively by Fe-AO-PAN in the dark, and reactive dyes showed higher initial degradation rate constants than acid dyes at the same conditions. Besides, there exists a linear relationship between M and CFe-PAN and D and k within initial reaction 50 min in the dark, and increasing quantitatively M and CFe-PAN could accelerate the dye degradation and obtain the same degradation effect as under irradiation.