Preparation And Application Of Photocatalytic Properties Of PAN Fibers

In order to solve the conventional problems of the Fenton Reaction, such as narrow pH scope and iron loss, this study makes the PAN Photocatalytic fibers, which is prepared through semi-carbonized (SC-PAN) and amidoxime reaction(AO-SC-PAN), and then adsorbing Fe (Ⅲ). Investigate the effects of semi-carbonization temperature, time of semi-carbonization’s constant temperature, temperature of chelating iron ion, initial iron concentration on the adsorbed amount of Fe (Ⅲ).Using the PAN photocatalytic fiber as a heterogeneous Fenton catalyst for the UV-Fenton degradation of Reactive Yellow X-R wastewater. The experimental results show that:Increasing hydrogen peroxide (H2O2) dosage and PAN photocatalytic fiber content is good to advance the decolorization rate. Acidic conditions and shortwave can improve the reaction rate.Application of the UV-Fenton system to degradation of various dyes. The experimental results show that:Decolorization of dyes varies with different chromatography. the parent structure of the dyes. Investigation the main degradation product based on UV-Vis spectroscopy. Studying the impact of the cycle times on the catalyst’stability. The experimental results show that:When the PAN photocatalytic fibers were cycled four times, the number of cycles have little effect on the decolorization rate. Losses of iron ion adsorbed on the photocatalytic PAN fiber reduce as the number of cycles increasing then tend to be stable. Strength has declined as the using time increasing, which is less than the photocatalytic fiber without semi-carbonized process.Testing the generation quantity of hydroxyl radicals and H2O2decomposition rate through the salicylic acid&visible spectrophotometry and potassium permanganate method respectively. The results show that:PAN photocatalytic fiber, H2O2, UV light has a synergistic effect on the degradation of dye wastewater in the heterogeneous UV-Fenton system. There are two mechanisms that homogeneous iron ions reaction mechanism and heterogeneous reaction mechanism. And UV light can both accelerate these two processes.