Enhanced debromination of 2,2’,4,4’-tetrabromodiphenyl ether(BDE-47)by zero-valent zinc with ascorbic acid  

作　　者：Chaojin Jiang Xiaoqian Jiang Lixun Zhang Yuntao Guan 

机构地区：[1]Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety,Tsinghua Shenzhen International Graduate School,Shenzhen 518055,China [2]State Environmental Protection Key Laboratory of Microorganism Application and Risk Control,School of Environment,Tsinghua University,Beijing 100084,China

出　　处：《Frontiers of Environmental Science & Engineering》2020年第3期127-139,共13页环境科学与工程前沿（英文）

基　　金：The authors thank the Major Science and Technology Program for Water Pollution Control and Treatment,National Water Grant(No.2017ZX07202002);the Key-Area Research and Development Program of Guangdong Provice(No.2019B110205003);the National Natural Science Foundation of China(Grant No.51979141).

摘　　要：A new technique of zero-valent zinc coupled with ascorbic acid(ZVZ/AA)was developed and applied to debrominate the 2,2,,4,4,-Tetrabromodiphenyl ether(BDE-47),which achieved high conversion and rapid debromination of BDE-47 to less-or non-toxic forms.The reaction conditions were optimized by the addition of 100 mg/L Z V Z particles and 3 mmol/L A A at original solution p H=4.00 using the solvent of methanol/H2O(v:v=4:6),which could convert approximately 94%of 5 mg/L BDE-47 into lower-brominated diphenyl ethers within a 90 min at the ZVZ/AA system.The high debromination of BDE-47 was mainly attributed to the effect of A A that inhibits the formation of Zn(Ⅱ)(hydr)oxide passivation layers and promotes the corrosion of ZVZ,which leads to increase the reactivity of ZVZ.Additionally,ion chromatography and gas chromatography mass spectrometry analyses revealed that bromine ion and lower-debromination diphenyl ethers formed during the reduction of BDE-47.Furthermore,based on the generation of the intermediates products,and its concentration changes over time,it was proposed that the dominant pathway for conversion of BDE-47 was sequential debromination and the final products were diphenyl ethers.These results suggested that the ZVZ/AA system has the potential for highly efficient debromination of BDE-47 from wastewater.

关 键 词：2 2  4 4 -tetrabromodiphenyl ether(BDE-47) Ascorbic acid Reductive debromination Zero-valent zinc 

分 类 号：X703[环境科学与工程—环境工程]