Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian 116024, PR China.
J Hazard Mater. 2010 Aug 15;180(1-3):436-41. doi: 10.1016/j.jhazmat.2010.04.049. Epub 2010 Apr 18.
The remediation of pentachlorophenol (PCP) contaminated soil using pulsed corona discharge plasma was reported in this study. The effect of practical run parameters such as peak pulse voltage, pulse frequency, gas atmospheres (air, O(2), Ar and N(2)), air flow rate and pollution time on PCP degradation was investigated, and the intermediate products were also studied. The results indicated that PCP degradation efficiency increased with an increase in peak pulse voltage or pulse frequency, due to the enhancement of energy input. There existed a maximal PCP degradation efficiency with the change of air flow rate. PCP degradation efficiencies under oxygen and air atmospheres were achieved 92% and 77% after 45 min of discharge treatment at 14.0 kV, respectively, which were only 19% and 8% under argon and nitrogen atmospheres, respectively. O(3) played an important role in PCP degradation. However, other processes also contributed to PCP degradation, such as N, N(2)(+), N(+) and OH. The pollution time evidenced slight influence on PCP degradation. The main intermediate products produced during the treatment process were identified as tetrachlorocatechol, tetrachlorohydroquinone, acetic acid, formic acid and oxalic acid by HPLC/MS and ion chromatography. This study is expected to provide reference for the application of pulsed corona discharge in soil remediation.
本文报道了利用脉冲电晕放电等离子体修复五氯酚（PCP）污染土壤。研究了实际运行参数，如峰值脉冲电压、脉冲频率、气体氛围（空气、O2、Ar 和 N2）、空气流量和污染时间对 PCP 降解的影响，并研究了中间产物。结果表明，随着峰值脉冲电压或脉冲频率的增加，PCP 的降解效率增加，这是由于能量输入的增强。空气流量的变化存在最大的 PCP 降解效率。在 14.0 kV 下放电处理 45 分钟后，氧气和空气气氛下的 PCP 降解效率分别达到 92%和 77%，而在氩气和氮气气氛下分别仅为 19%和 8%。O3 在 PCP 降解中起重要作用。然而，其他过程也有助于 PCP 的降解，如 N、N2(+)、N(+) 和 OH。污染时间对 PCP 的降解影响不大。通过高效液相色谱/质谱和离子色谱，确定了处理过程中产生的主要中间产物为四氯邻苯二酚、四氯对苯二酚、乙酸、甲酸和草酸。本研究有望为脉冲电晕放电在土壤修复中的应用提供参考。
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