Atmospheric pressure plasma corona enhanced by photoionizer for degradation of VOCs

Sungyoon Jung, Jiaxi Fang, Tandeep S. Chadha, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A hybrid titanium dioxide (TiO2)-integrated photoionization enhanced atmospheric pressure plasma corona system was developed for effective toluene removal. The individual and synergistic effects of a corona discharge, a photoionizer irradiation with a soft x-ray source, and a TiO2 photocatalyst on toluene removal were investigated by performing various experiments. Voltage-current characteristics revealed a lower corona inception voltage and a higher current at the same voltage caused by combining the corona discharge, the photoionizer irradiation, and the TiO2 photocatalyst. The toluene removal efficiency was significantly enhanced by combining the corona discharge, the photoionizer irradiation, and the TiO2 photocatalyst: (corona discharge + photoionizer irradiation + TiO2: ∼86.0%) > (corona discharge + TiO2: ∼70.8%) > (corona discharge + photoionizer irradiation: ∼51.1%) > (corona discharge: ∼43.8%). The toluene removal efficiency increased with an increase in the photoionizer energy. These trends were mainly due to the degree of ion generation in the system. Corona discharge generates ions inside the system, and ion concentration increases as the applied voltage is increased. The photoionizer creates positive and negative ions, which lowers the corona inception voltage and enhances the current. The TiO2 film also enhances ion production under corona discharge, and is activated by photoionizer irradiation to create additional electron-hole pairs. In addition, the rougher surface induced by the morphology change in TiO2 under corona discharge has a positive effect on toluene removal.

Original languageEnglish (US)
Article number445206
JournalJournal of Physics D: Applied Physics
Volume51
Issue number44
DOIs
StatePublished - Oct 3 2018
Externally publishedYes

Keywords

  • corona discharge
  • photocatalyst
  • photoionizer irradiation
  • toluene removal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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