UV/SO₃ ^2-体系降解水中十溴联苯醚

Decabromodiphenyl ether (BDE-209) is one of the most widely used borminated flame retardants around the world. It can escape into the environment over time. Due to the properties of persistence, lipophilicity and bioaccumulation, BDE-209 has become a global environmental organic contaminant. In this study, an advanced reduction process (ARPs) that combined UV irradiation and sulfite (SO^2- ₃) was applied to degrade BDE-209. The influences of the sulfite concentration,pH and initial concentration of the BDE-209 on the degradation and debromination were studied. In addition, the degradation process was investigated by dynamic analysis. The experimental results showed that under the optimum conditions: pH 7 and sulfite concentration of 1.0 mmol•L^-1,93.54% of the BDE-209 (0.3 μmol•L^-1) was degraded after 90 min. Increasing the concentration of the sulfite and acidic conditions improved the removal efficiency and the debromination rate of BDE-209, whereas higher initial BDE-209 concentrations resulted in lower efficiency. The degradation process of BDE-209 followed pseudo first-order kinetics. The debromination was mainly achieved by e_aq ^- attacking C-Br bond gradually.