Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian 116024, PR China.
Environ Sci Technol. 2010 Apr 15;44(8):3105-10. doi: 10.1021/es903527w.
Chlorinated organics are frequently found as harmful soil contaminants and persisted for extended periods of time. A novel approach, named pulsed corona discharge plasma (PCDP), was employed for the degradation of pentachlorophenol (PCP) in soil. Experimental results showed that 87% of PCP could be smoothly removed in 60 min. Increasing pulse voltage, enhancing soil pH, lowering humic acid (HA) in soil and reducing granular size of the soil were found to be favorable for PCP degradation efficiency. Oxidation and physical processes simultaneously contributed to PCP removal in soil and ozone was the main factor in PCDP treatment. C-Cl bonds in PCP were cleaved during PCDP treatment by Fourier transform infrared spectroscopy (FTIR) analysis. The mineralization of PCP was confirmed by total organic carbon (TOC) and dechlorination analyses. The main intermediate products such as tetrachlorocatechol, tetrachlorohydroquinone, acetic acid, formic acid, and oxalic acid were identified by HPLC/MS and ion chromatography. A possible pathway of PCP degradation in soil in such a system was proposed.
氯代有机物是常见的有害土壤污染物，在土壤中存在时间较长。本文采用一种新型方法，即脉冲电晕放电等离子体（PCDP），用于降解土壤中的五氯苯酚（PCP）。实验结果表明，在 60 分钟内，87%的 PCP 可被顺利去除。提高脉冲电压、增强土壤 pH 值、降低土壤中的腐殖酸（HA）和减小土壤颗粒尺寸均有利于提高 PCP 的降解效率。氧化和物理过程共同促进了土壤中 PCP 的去除，而臭氧是 PCDP 处理中的主要因素。傅里叶变换红外光谱（FTIR）分析表明，PCDP 处理过程中 PCP 中的 C-Cl 键被切断。通过总有机碳（TOC）和脱氯分析证实了 PCP 的矿化。通过高效液相色谱/质谱（HPLC/MS）和离子色谱分析，确定了主要的中间产物，如四氯邻苯二酚、四氯对苯二酚、乙酸、甲酸和草酸。提出了该体系中土壤中 PCP 降解的可能途径。
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