Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
576571 | Journal of Hazardous Materials | 2014 | 5 Pages |
Abstract
Nanoscale zero-valent iron (nZVI) has been considered as an effective agent for reductive debromination of polybrominated diphenyl ethers (PBDEs). But the high lipophilicity of PBDEs will hinder their debromination owing to the inefficient contact of PBDEs with nZVI. In this study, different ionic forms of surfactants were investigated aiming to promote PBDE debromination, and the beneficial effects of surfactant were found to be: nonionic polyethylene glycol octylphenol ether (Triton X-100, TX)Â >Â cationic cetylpyridinium chloride (CPC)Â >Â anionic sodium dodecyl benzenesulfonate (SDDBS). Except for with SDDBS, the promotion effect for PBDE debromination was positively related to the surfactant concentrations until a critical micelle concentration (CMC). The debromination process of octa-BDE and its intermediates could be described as a consecutive reaction. The corresponding rate constants (k) for the debromination of parent octa-BDE (including nona- to hepta-BDEs), the intermediates hexa-, penta-, and tetra-BDEs are 1.24Â ÃÂ 10â1Â hâ1, 8.97Â ÃÂ 10â2Â hâ1, 6.50Â ÃÂ 10â2Â hâ1 and 2.37Â ÃÂ 10â3Â hâ1, respectively.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Da-wei Liang, Yu-han Yang, Wei-wei Xu, Si-kan Peng, Shan-fu Lu, Yan Xiang,