Journal
CHEMICAL ENGINEERING JOURNAL
Volume 437, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135089
Keywords
Persistent organic pollutants; Pollutant degradation; Dielectric barrier discharge; Plasma-catalytic; Remediation of soil
Categories
Funding
- National Natural Science Foundation of China [11965018, 51967017, 50967018, 52077026]
- Science and Technology Development Fund of Xinjiang Production and Construction [2019BC009]
- National Defense Science and Technology Key Laboratory Fund Project [6142605200303]
- Sci-ence and Technology Plan Project of the Ninth Fund of Xinjiang Pro-duction and Construction [2021JS003]
- Fundamental Research Funds for the Central Universities [DUT21LK31]
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In this study, a parallel tubes-array dielectric barrier discharge reactor was developed to degrade persistent organic pollutants in soil. The results showed that the degradation efficiency of pyrene can be greatly improved by tuning the applied voltage, initial concentration, and catalysts.
Persistent organic pollutants are harmful to the human health and environment due to their toxicity, chemical stability, degradation resistance and high bioaccumulation. In this paper, a parallel tubes-array dielectric barrier discharge reactor is developed to generate homogeneous discharge plasma and degrade the persistent organic pollutants in soil. The effects of applied voltage, initial concentration of pyrene and catalysts on the pyrene degradation efficiency in soil are studied. The results show that the degradation effect can be greatly improved by tuning these influencing parameters. The degradation efficiency of pyrene is significantly enhanced as the applied voltage increases. It reaches 96.23% at 28 kV in simulated soil and 98.26% at 26 kV in actual soil with 100 mg/kg initial concentration, and 10 min plasma treatment time. A significant promotion effect on the degradation efficiency can be obtained with the decrease of the initial pyrene concentration. Likewise, the addition of the catalysts CeO2 and TiO2 significantly improves the pyrene degradation efficiency and presents obvious synergistic effect with plasma. The discharge characteristics are discussed in combination with discharge images, waveforms of current and voltage. And the degradation mechanism of pyrene is analyzed combine with the optical emission spectra.
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