Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education of the People's Republic of China, Dalian, 116024, China.
Institute of Electrostatics and Special Power, School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China.
Environ Sci Pollut Res Int. 2022 Aug;29(38):58110-58120. doi: 10.1007/s11356-022-19912-6. Epub 2022 Apr 1.
In the present work, plasma remediation of p-nitrophenol (PNP) contaminated soil was performed in a novel spray-type coaxial cylindrical dielectric barrier discharge (DBD) system at ambient temperature. This system is capable of generating large-size nonthermal plasma (NTP) and improving the diffusion and transfer of chemical active species around the dispersed soil particles. Several key parameters including plasma treatment time, discharge voltage, soil granular size, the entry speed of soil, PNP initial concentration, gas variety, and gas flow rate were investigated in terms of PNP degradation and energy efficiencies. Under the optimized experimental conditions, 54.2% of PNP was degraded after only 50 s discharge treatment, indicating that the spray-type coaxial cylindrical DBD system can degrade organic pollutants in soil more quickly compared to other plasma systems due to its efficient transfer of reactive oxygen and nitrogen species (RONS) into the contaminated soil. The possible PNP degradation pathways were proposed based on intermediates identification results and the role of reactive species analysis. The toxicological assessment of the PNP decomposition products was conducted by quantitative structure-activity relationship (QASR) analysis. This work is expected to provide a potential plasma technology for rapid and efficient processing of industrial organic pollutants contamination soil.
在本工作中，采用新型喷雾同轴圆柱形介质阻挡放电（DBD）系统在环境温度下对 p-硝基苯酚（PNP）污染土壤进行等离子体修复。该系统能够产生大尺寸的非热等离子体（NTP），并改善分散土壤颗粒周围化学活性物质的扩散和转移。从 PNP 降解和能量效率的角度，考察了等离子体处理时间、放电电压、土壤颗粒大小、土壤进入速度、PNP 初始浓度、气体种类和气体流量等几个关键参数。在优化的实验条件下，仅经过 50 s 的放电处理，就有 54.2%的 PNP 被降解，表明与其他等离子体系统相比，喷雾同轴圆柱形 DBD 系统由于能够将活性氧和氮物种（RONS）高效地转移到污染土壤中，因此能够更快地降解土壤中的有机污染物。根据中间产物的鉴定结果和活性物质分析，提出了可能的 PNP 降解途径。通过定量结构-活性关系（QASR）分析对 PNP 分解产物的毒理学评估。这项工作有望为快速高效处理工业有机污染物污染土壤提供一种潜在的等离子体技术。
