科研之友
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摘要
Although penta- and octa-BDE congeners were included in the Stockholm Convention recently, decabromodiphenyl ether (BDE 209) is currently exempted from regulation and continues to be used heavily. Thus a large amount of environmental samples has been seriously contaminated, which calls for proper economic remediation technologies. In this study, debromination of BDE 209 with sponge iron, also called direct-reduced iron, was studied to investigate the degradation process and reaction kinetics. The reaction was described well by the pseudo-first-order kinetic model. With increasing reaction time, sponge iron particles could debrominate BDE 209 into lower environmental dominant brominated compounds, such as BDE-153, BDE-100, BDE-99, BDE-47 and diphenyl ether, the complete debromination product. This is the first report of complete debromination of BDE 209 using sponge iron. Influenced by iron dosage, PBDEs concentration, solvent condition and other parameters, the reaction rates were comparable with nanoscale zerovalent iron and other Fe-based materials. From an engineering point of view, sponge iron would spawn low-cost remediation technologies for complete detoxification of PBDEs and benefit practical halogenated organic compounds remediation.
- 出版日期2013-8
- 单位山东大学
