铁离子活化亚硫酸盐降解水中十溴二苯醚效果及机理研究  

Efficiency and Mechanism for the Degradation of Decabromodiphenyl Oxide in the Ironion-Activated Sulfite System

作　　者：刘飞[1] LIU Fei(China Railway Siyuan Survery and Design Group Co.,Ltd,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《水处理技术》2024年第7期91-96,102,共7页Technology of Water Treatment

基　　金：国家自然科学基金(51878308)。

摘　　要：十溴二苯醚(DBDPO)是一种广泛使用的具有环境持久性和生物累积性的溴代阻燃剂,严重危害水环境及用水安全。本论文系统研究了铁离子活化亚硫酸盐(Fe^(3+)/SO_(3)^(2−))降解水中DBDPO的效果及机理。研究结果表明,Fe^(3+)/SO_(3)^(2−)能够有效降解水中的DBDPO,其去除率可达到70%以上;硫酸根自由基(SO_(4)•^(−))在DBDPO的降解过程中发挥主导作用,且溶解氧为必需条件;DBDPO降解率随着SO_(3)^(2−)投量和Fe^(3+)投量升高均呈现出先增高后降低趋势;底物浓度与DBDPO降解率负相关,该体系降解DBDPO的最优pH范围为4.0~6.0;HCO_(3)−和HA均能够显著抑制DBDPO降解,而Cl^(-)对DBDPO降解的抑制作用较小;DBDPO在Fe^(3+)/SO_(3)^(2−)体系降解的初始反应为苯环上溴元素的羟基化取代和两个苯环连接键的断裂;Fe^(3+)/SO_(3)^(2−)处理能够有效降低DBDPO溶液的急性毒性。Decabromodiphenyl oxide(DBDPO)is a widely used brominated flame retardant with environmental persistence and bioaccumulation,which is harmful to the aquatic environment and water safety.The degradation efficiency and mechanism of the DBDPO in the iron ion-activated sulfite(Fe^(3+)/SO_(3)^(2−))system were well studied.The results illustrated that the Fe^(3+)/SO_(3)^(2−)system could effectively degrade the DBDPO with a removal rate of over 70%.Sulfate radical(SO_(4)•^(−))was evidenced to play the primary role in the DBDPO degradation,and dissolved oxygen is essential in the system.With elevating Fe^(3+)and SO_(3)^(2−)dosages,the DBDPO degradation rate followed a first increasing then decreasing trend.The substrate concentration performed a negative correlation to the DBDPO degradation rate.The best pH range in the system was 4.0~6.0 in the system.Both HCO3−and HA significantly inhibited the degradation of DBDPO,while Cl-only played a little role in the DBDPO degradation.The initial step for DBDPO degradation in the system included the substitution of bromine in the benzene ring by a hydroxyl group and the destruction of the functional group connecting the two benzene rings.The acute toxicity of DBDPO solution could be well reduced after treatment by the Fe^(3+)/SO_(3)^(2−)system.

关 键 词：铁离子 亚硫酸盐 十溴二苯醚 高级氧化 硫酸根自由基 

分 类 号：X703.1[环境科学与工程—环境工程]