UV/SO32-体系降解水中十溴联苯醚

十溴联苯醚（BDE-209）是全球应用最广泛的溴系阻燃剂之一。它可以长时间在环境中迁移，是一种亲脂疏水、可生物积累的难降解有机污染物。研究了UV/SO32-高级还原体系对BDE-209的降解动力学，并分别考察了SO32-浓度、pH、BDE-209初始浓度对其降解和脱溴效能的影响。结果表明，UV/SO32-体系在BDE-209初始浓度为0.3 μmol·L-1、pH为7、SO32-为1.0 mmol·L-1、反应90 min时的降解效果最佳，降解率为93.54%；SO32-浓度越高，BDE-209的降解和脱溴效果越好；酸性条件有利于BDE-209的降解；较高的BDE-209浓度不利于体系脱溴反应的进行。BDE-209的降解过程遵循伪一级动力学规律；脱溴过程主要通过eaq-攻击C-Br键分步实现。

Degradation of decabromodiphenyl ether in water by UV/SO32- system

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 (SO32-) 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 eaq- attacking C-Br bond gradually.