Fe/TiO₂-_x 可见光活化过硫酸盐降解双酚 A 的作用机制

In this study, TiO₂ and FeCl₃ was used as raw materials, Fe/TiO₂-_X catalysts with high visible light catalytic activity were successfully prepared by hydrothermal-calcination method and applied to the catalytic degradation of BPA by persulfate. The results showed that this system has excellent catalytic oxidation ability, the degradation rate of BPA (50mg/L) reached 100% in 40min, and the salinity reached 68.92%. At the same time, the effects of self-doped Ti³⁺ in the composite and the amount of catalyst and PS concentration on the degradation of organic compounds were studied. This system can realize the efficient cycle of trivalent iron and divalent iron by autogenic photoelectron reduction of Fe³⁺. Sulfate radical (SO₄^-•) and hydroxyl radical (•OH) were the main active oxidizing substances in the system, of which the contribution rate of •OH is more than 66.2%. The result also showed that alkaline environment and inorganic anions such as CO₃^2- had negative effect on the performance of the system.