Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China.
J Hazard Mater. 2014 Jul 15;276:26-34. doi: 10.1016/j.jhazmat.2014.05.018. Epub 2014 May 13.
The extent of PAH transformation, the formation and transformation of reaction byproducts during persulfate oxidation of polycyclic aromatic hydrocarbons (PAHs) in coking plant soil was investigated. Pre-oxidation analyses indicated that oxygen-containing PAHs (oxy-PAHs) existed in the soil. Oxy-PAHs including 1H-phenalen-1-one, 9H-fluoren-9-one, and 1,8-naphthalic anhydride were also produced during persulfate oxidation of PAHs. Concentration of 1,8-naphthalic anhydride at 4h in thermally activated (50°C) persulfate oxidation (TAPO) treatment increased 12.7 times relative to the oxidant-free control. Additionally, the oxy-PAHs originally present and those generated during oxidation can be oxidized by unactivated or thermally activated persulfate oxidation. For example, 9H-fluoren-9-one concentration decreased 99% at 4h in TAPO treatment relative to the control. Thermally activated persulfate resulted in greater oxy-PAHs removal than unactivated persulfate. Overall, both unactivated and thermally activated persulfate oxidation of PAH-contaminated soil reduced PAH mass, and oxidized most of the reaction byproducts. Consequently, this treatment process could limit environmental risk related to the parent compound and associated reaction byproducts.
研究了焦化厂土壤中多环芳烃（PAHs）过硫酸盐氧化过程中 PAH 的转化程度、反应副产物的形成和转化。预氧化分析表明，土壤中存在含氧多环芳烃（oxy-PAHs）。在 PAHs 的过硫酸盐氧化过程中，也生成了含氧多环芳烃，包括 1H-苯并菲-1-酮、9H-芴-9-酮和 1,8-萘二甲酸酐。在热激活（50°C）过硫酸盐氧化（TAPO）处理中，4 小时时 1,8-萘二甲酸酐的浓度相对于无氧化剂对照增加了 12.7 倍。此外，原来存在的 oxy-PAHs 和氧化过程中生成的 oxy-PAHs 可以被未激活或热激活的过硫酸盐氧化。例如，在 TAPO 处理中，9H-芴-9-酮的浓度在 4 小时内相对于对照降低了 99%。热激活过硫酸盐导致 oxy-PAHs 的去除率高于未激活过硫酸盐。总的来说，受 PAH 污染的土壤的未激活和热激活过硫酸盐氧化都降低了 PAH 的质量，并氧化了大部分反应副产物。因此，这种处理过程可以限制与母体化合物和相关反应副产物相关的环境风险。
