过硫酸盐
过硫酸钠
化学
降级(电信)
苯
挥发性有机化合物
高级氧化法
激进的
催化氧化
无机化学
催化作用
核化学
环境化学
臭氧
羟基自由基
有机化学
电信
计算机科学
作者
Kun-Chang Huang,Zhiqiang Zhao,George E. Hoag,Amine Dahmani,P. A. Block
出处
期刊:Chemosphere
[Elsevier]
日期:2005-10-01
卷期号:61 (4): 551-560
被引量:376
标识
DOI:10.1016/j.chemosphere.2005.02.032
摘要
This study investigated the extent and treatability of the degradation of 59 volatile organic compounds (VOCs) listed in the EPA SW-846 Method 8260B with thermally activated persulfate oxidation. Data on the degradation of the 59 VOCs (in mixture) reacted with sodium persulfate in concentrations of 1 g l−1 and 5 g l−1 and at temperatures of 20 °C, 30 °C, and 40 °C were obtained. The results indicate that persulfate oxidation mechanisms are effective in degrading many VOCs including chlorinated ethenes (CEs), BTEXs and trichloroethanes that are frequently detected in the subsurface at contaminated sites. Most of the targeted VOCs were rapidly degraded under the experimental conditions while some showed persistence to the persulfate oxidation. Compounds with “CC” bonds or with benzene rings bonded to reactive functional groups were readily degraded. Saturated hydrocarbons and halogenated alkanes were much more stable and difficult to degrade. For those highly persulfate-degradable VOCs, degradation was well fitted with a pseudo first-order decay model. Activation energies of reactions of CEs and BTEXs with persulfate were determined. The degradation rates increased with increasing reaction temperature and oxidant concentration. Nevertheless, to achieve complete degradation of persulfate-degradable compounds, the systems required sufficient amounts of persulfate to sustain the degradation reaction.
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