Debromination of Tetrabromobisphenol A by Nanoscale Zerovalent Iron: Kinetics, Influencing Factors, and Pathways
详细信息 查看全文
- 作者：Kunde Lin ; Jiafeng Ding ; Xinwen Huang
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2012
- 出版时间：June 27, 2012
- 年：2012
- 卷：51
- 期：25
- 页码：8378-8385
- 全文大小：358K
- 年卷期：v.51,no.25(June 27, 2012)
- ISSN：1520-5045
文摘
Tetrabromobisphenol A (TBBPA) is one of the most widely used brominated flame retardants and is ubiquitously present in the environment. In this study, we investigated the debromination of TBBPA by nanoscale zerovalent iron (nZVI) in methanol/water (50/50) solutions. Zerovalent iron nanoparticles demonstrated an excellent capacity to debrominate TBBPA to tribromobisphenol A, dibromobisphenol A, bromobisphenol A, and bisphenol A. More than 86% of TBBPA was debrominated within 16 h in a pH 7.5 reaction solution initially containing 3.0 g/L of nZVI. Debromination of TBBPA was apparently accompanied by the release of bromine ions and the elevation of solution pH. The debromination kinetics could be well-described by a three-parameter pseudo-first-order decay model. A higher loading of nZVI and acidic conditions facilitated the debromination process, while coexisting Ca2+ and Na+ species inhibited the reaction. On the basis of identified reaction intermediates and products, TBBPA debromination pathways by nZVI were proposed. This study suggests that nZVI may be potentially employed to debrominate TBBPA in soil and sediment.