UV/Na2SO3还原体系降解十溴联苯醚

Efficient Reductive Degradation of Decabromodiphenyl Ether by UV/Na2SO3 Process

针对多溴联苯醚毒害性强、难以降解的特点,研究以十溴联苯醚为研究对象,采用紫外/亚硫酸钠还原法进行了降解实验。考察了pH值、还原剂浓度、紫外光强、反应时间等因素对降解效果的影响。结果表明,UV/Na2SO3还原法对十溴联苯醚具有较好的去处效果,在最佳条件pH值为10、Na2SO3的投加量为1 mmol/L、选取紫外光强度为350 uW/cm2、反应60 min时,降解率可达到86.87%。结合动力学分析表明,反应符合一级动力学方程。通过脱溴实验证实,反应过程发生了溴离子的部分脱除。

Decabromodiphenyl ether(DBDE) are toxic and persistent, and their efficient degration is currently a challenge. In this study, decabromodiphenyl ether(BDE-209) was selected as the target compound and was degraded by a UV/sulfite process. The effects of pH, sulfur(IV) concentration, UV light intensity, and reaction time on effectiveness of the system were studied. The results showed that a high removal efficiency could be achieved by the process. The optimal BDE-209 removal(86.87 %) was obtained when pH was 10, sulfur(IV) concentration was 1 mmol/L, ultraviolet intensity is 350 uW/cm2, and the reaction time is 60 min, respectively. The degradation reactions followed the pseudo-first-order kinetics. Meanwhile, it was proved that the removal of partial bromine ion occurred during the reaction.