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UV/SO32-体系降解水中十溴联苯醚
Degradation of decabromodiphenyl ether in water by UV/SO32- system
投稿时间:2017-06-12  修订日期:2017-08-29
DOI:10.12030/j.cjee.201706082
中文关键词:  BDE-209  UV/SO32-体系  降解  脱溴  动力学
英文关键词:BDE-209  UV/SO32- system  degradation  debromination  kinetics
基金项目:国家水体污染控制与治理科技重大专项(2012ZX07206-002)
作者单位
苍岩 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 
余娜 安徽省交通规划设计研究总院股份有限公司, 合肥 230000 
李继 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 
杨兢欣 中山大学化学工程与技术学院, 珠海 519082 
宋伟 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 
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中文摘要:
      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/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。
英文摘要:
      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.
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