UV／SO3 2-体系降解水中十溴联苯醚  

Degradation of decabromodiphenyl ether in water by UV/SO_3^(2-) system

作　　者：苍岩 余娜 李继[1] 杨兢欣 宋伟[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,深圳市水资源利用与环境污染控制重点实验室,深圳518055 [2]安徽省交通规划设计研究总院股份有限公司,合肥230000 [3]中山大学化学工程与技术学院,珠海519082

出　　处：《环境工程学报》2017年第12期6233-6239,共7页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07206-002)

摘　　要：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/SO_3^(2-)高级还原体系对BDE-209的降解动力学,并分别考察了SO_3^(2-)浓度、p H、BDE-209初始浓度对其降解和脱溴效能的影响。结果表明,UV/SO_3^(2-)体系在BDE-209初始浓度为0.3μmol·L^(-1)、p H为7、SO_3^(2-)为1.0 mmol·L^(-1)、反应90 min时的降解效果最佳,降解率为93.54%;SO_3^(2-)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e_(aq)攻击C—Br键分步实现。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.

关 键 词：BDE-209 UV SO3 2-体系 降解 脱溴 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]