Remediation of perfluorooctanoic acid (PFOA) polluted soil using pulsed corona discharge plasma.
Remediation of perfluorooctanoic acid (PFOA) polluted soil using pulsed corona discharge plasma.
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DOI：
10.1016/j.jhazmat.2019.121688
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发表时间：
2019-11
影响因子：
13.6
通讯作者：
Jiaxun Zhan;Ai Zhang;P. Héroux;Ying Guo;Zhuyu Sun;Zhenyu Li;Jingyi Zhao;Yanan Liu
中科院分区：
文献类型：
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作者：
Jiaxun Zhan;Ai Zhang;P. Héroux;Ying Guo;Zhuyu Sun;Zhenyu Li;Jingyi Zhao;Yanan Liu
受污染土壤中的全氟辛酸 (PFOA) 在高等生物体内积聚，对人类造成健康风险。本研究中，采用脉冲正放电等离子体，在电压30kV、放电频率50Hz、土壤湿度1%、PFOA浓度300ppm、土壤pH值6.3的条件下，71%的PFOA被降解，其中51%分解为短链副产物，19%矿化，1%挥发。通过一系列实验，电子被确定为 PFOA 降解的主要活性方式。通过 LC-MS 分析分解副产物。结果表明，PFOA分解为小副产物，包括全氟庚酸（PFHpA）、全氟己酸（PFHxA）、全氟戊酸（PFPeA）、全氟丁酸（PFBA）、五氟丙酸（PFPrA）和三氟乙酸（TFA）。此外，等离子处理后的土壤中，氨氮浓度从不足10ppm上升至462ppm，生菜的平均干重比天然土壤高1.6mg。另外，处理后浮霉菌和硝化螺旋菌增多，表明等离子体技术促进了氮循环过程。因此，利用脉冲电晕等离子体技术可以修复PFOA污染的土壤，同时无需化学注射即可提高土壤的肥力。
Perfluorooctanoic acid (PFOA) from contaminated soil accumulates in higher organisms, and causes health risks to humans. In this research, 71 % of the PFOA was degraded, of which 51 % was decomposed into short chain by-products, 19 % mineralized, and 1 % volatilized with 30 kV of voltage, 50 Hz of discharge frequency, 1 % of soil moisture, 300 ppm of PFOA concentration and 6.3 of soil pH using pulsed positive discharge plasma. From a series of experiments, electrons were identified as the dominant active means of PFOA degradation. The decomposition by-products were analyzed by LC–MS. The results indicated that PFOA was decomposed into small by-products including perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), perfluoropentanoic acid (PFPeA), perfluorobutyric acid (PFBA), pentafluoropropionic acid (PFPrA) and trifluoroacetic acid (TFA). Moreover, in plasma treated soil, the concentration of ammonia nitrogen increased from less than 10 ppm–462 ppm, and the average dry weight of lettuce was 1.6 mg higher than that in natural soil. Additionally,PlanctomycetesandNitrospiraeincreased after treatment, indicating that plasma technology promotes the process of nitrogen cycle. Thus, PFOA polluted soil could be remediated using this pulse corona plasma technology, and simultaneously improve the fertility of soil without chemical injections.