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 ZVZ particles and 3 mmol/L AA at original solution pH = 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 AA 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.

开发了零价锌与抗坏血酸偶联的新技术（ZVZ / AA），并将其用于脱溴2,2'，4,4'-四溴二苯醚（BDE-47），实现了高转化率和快速脱溴。 BDE-47为低毒或无毒形式。通过使用甲醇/ H ₂溶剂在原始溶液pH = 4.00下添加100 mg / L ZVZ颗粒和3 mmol / L AA来优化反应条件O（v：v = 4：6），在ZVZ / AA系统中，可在90分钟内将大约94％的5 mg / L BDE-47转化为低溴化二苯醚。BDE-47的高脱溴主要归因于AA抑制Zn（II）（hydr）oxide钝化层形成并促进ZVZ腐蚀的作用，从而提高ZVZ的反应性。另外，离子色谱和气相色谱质谱分析表明，在BDE-47还原过程中形成了溴离子和低脱溴二苯醚。此外，根据中间体产物的产生及其浓度随时间的变化，提出了BDE-47转化的主要途径是顺序脱溴，最终产物是二苯醚。