Removal of decabromodiphenyl ether (BDE-209) by sepiolite-supported nanoscale zerovalent iron

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• 作者：Rongbing Fu ; Na Mu ; Xiaopin Guo ; Zhen Xu&#8230
• 关键词：sepiolite ; supported nanoscale zerovalent iron ; decabromodiphenyl ether ; debromination ; adsorption ; mechanism
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：9
• 期：5
• 页码：867-878
• 全文大小：1,921 KB
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• 作者单位：Rongbing Fu (1) (2)
  Na Mu (1)
  Xiaopin Guo (2)
  Zhen Xu (2)
  Dongsu Bi (1)
  
  1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418, China
  2. Shanghai Academy of Environmental Sciences, Shanghai, 200233, China
  
• 刊物主题：Environment, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-221X

文摘

Nanoscale zerovalent iron (nZVI) synthesized using sepiolite as a supporter was used to investigate the removal kinetics and mechanisms of decabromodiphenyl ether (BDE-209). BDE-209 was rapidly removed by the prepared sepiolite-supported nZVI with a reaction rate that was 5 times greater than that of the conventionally prepared nZVI because of its high surface area and reactivity. The degradation of BDE-209 occurred in a stepwise debromination manner, which followed pseudo-first-order kinetics. The removal efficiency of BDE-209 increased with increasing dosage of sepiolite-supported nZVI particles and decreasing pH, and the efficiency decreased with increasing initial BDE-209 concentrations. The presence of tetrahydrofuran (THF) as a cosolvent at certain volume fractions in water influenced the degradation rate of sepiolite-supported nZVI. Debromination pathways of BDE-209 with sepiolite-supported nZVI were proposed based on the identified reaction intermediates, which ranged from nona- to mono-brominated diphenylethers (BDEs) under acidic conditions and nonato penta-BDEs under alkaline conditions. Adsorption on sepiolite-supported nZVI particles also played a role in the removal of BDE-209. Our findings indicate that the particles have potential applications in removing environmental pollutants, such as halogenated organic contaminants. Keywords sepiolite-supported nanoscale zerovalent iron decabromodiphenyl ether debromination adsorption mechanism