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Abatement of gas-phase VOCs via dielectric barrier discharge plasmas

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Abstract

Non-thermal plasma (NTP) technology is regarded as promising method for abatement of volatile organic compounds (VOCs) and has gained substantial interests in the fields of air purification. In this present work at atmospheric pressure, dielectric barrier discharge (DBD) plasma has been employed and utilized to evaluate feasibility of toluene, benzene, and m-xylene degradation in a parallel plate type DBD reactor taking argon as a carrier gas. The composition of post-plasma-treated by-products is studied by various spectroscopic techniques such as GC, GCMS, and FTIR, and the corresponding computational work is carried out by Gaussian software. The by-products obtained are analyzed in order to ascertain their structure and stability. The degradation of the VOCs to CO and CO2 has been affirmed from the GC and GCMS analyses. Furthermore, the probable degradation pathway for the degradation of the aforementioned VOCs has been deciphered and the most feasible path is suggested. Additionally, DFT calculations have been performed to have an idea about the energies of the pathways involved. This research work has been carried out without use of any catalyst. Surprisingly, the degradation observed is much higher than the reported values. These findings would be helpful towards the abatement of VOCs by the use of non-thermal plasma.

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Funding

SERB, India, provided funding to carry out this piece of work.

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Contributions

(1) Pranita Panda: done experiment, writing draft manuscript and calculations (computational)

(2) Rajesh Mahanta: done experiment, review and calculations (computational)

(3) Suchitra Mohanty: helped in data collection and references

(4) Rita Paikaray: helped in review editing

(5) Smrutiprava Das: corresponding author (overall supervision, conceptualization, editing, calculation and correction)

Corresponding author

Correspondence to Smruti Prava Das.

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Panda, P., Mahanta, R.K., Mohanty, S. et al. Abatement of gas-phase VOCs via dielectric barrier discharge plasmas. Environ Sci Pollut Res 28, 28666–28679 (2021). https://doi.org/10.1007/s11356-021-12565-x

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  • DOI: https://doi.org/10.1007/s11356-021-12565-x

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