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To investigate the effects of different structural parameters in the degradation of o -Dichlorobenzene (o -DCB) by dielectric barrier discharge nonthermal plasma (DBD-NTP) and to explore the optimal reactor structural parameters, experimental investigations were carried out using plasma reactors of different structures. The effects of single and double dielectric, different high-voltage electrode positions, different dielectric thicknesses, different discharge gaps and different discharge lengths on the degradation efficiency, carbon monoxide and carbon dioxide selectivity, carbon balance, and ozone of o -DCB were investigated in the reactor. The results show that single dielectric, external high-voltage electrode and lower dielectric thickness, discharge gap, and longer discharge length favor ozone control and improve o -DCB degradation and carbon monoxide CO2 selectivity as well as carbon balance. [ABSTRACT FROM AUTHOR]

In this paper, the degradation of o -DCB under different gas-phase parameter conditions was investigated using the SDBD-NTP system. The results showed that the increase in initial and oxygen concentrations had opposite effects on the degradation of o -DCB. Among them, the increase of oxygen concentration promoted the degradation of o -DCB. Relative humidity promoted and then inhibited the degradation of o -DCB. The highest degradation efficiency of o -DCB was achieved at RH = 15%, reaching 91% at 29W. In the study of by-products, it was found that O 3 and NO x were the main inorganic by-products, and that different oxygen levels and relative humidity conditions had a large effect on the production of O 3 and NO x. In all of them, the concentration of O 3 decreased with the increase of input power. NO x increased with increasing oxygen concentration, but the increase in relative humidity inhibited the production of NO and N 2 O and promoted the conversion of NO 2. A study of organic by-products revealed this. In the absence of oxygen, a higher number of benzene products appeared. Whereas, with the addition of oxygen, only in the by-products under conditions where no relative humidity was introduced, benzene ring products were predominantly present in the by-products. However, when RH was added, n-hexane was found to be present in the by-products. This may be because the introduction of O H • favors the destruction of the benzene ring. Finally, the possible reaction pathways and reaction mechanisms of o -DCB under different gas-phase parameters are given. It provides a reference for future related scientific research as well as scientific problems in practical applications. [Display omitted] • Oxygen contributes to the degradation and mineralization of o -DCB. • The addition of water facilitates ozone degradation and NO 2 production. • The addition of O H • contributes to the destruction of the benzene ring structure. • The possible degradation and reaction pathways of o -DCB under SDBD are given. [ABSTRACT FROM AUTHOR]