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  Global Journal of Environmental Science and Technology 2012, 2: 3
  Review Article
Abatement of air pollutants in combined plasma and photocatalytic systems
  Alexander V. Vorontsov, Mikhail N. Lyulyukin, Alexey S. Besov  
Boreskov Institute of Catalysis and Novosibirsk State University, Novosibirsk 630090, Russia
  The paper reviews recent progress in investigating the combination of two advanced oxidation techniques, atmospheric pressure non-thermal plasma and photocatalytic oxidation (PCO), for purification of air from CO and organic compounds. Non-thermal plasma (NTP) is created in electric discharges, typically dielectric barrier discharge and corona discharge. Oxidation of air pollutants in these discharges is efficient but a lot of byproducts are generated including nitrogen oxides, ozone and partial oxidation products. Photocatalytic oxidation generated much lower quantities of products but is less efficient especially for compounds with high volatility. There are several types of configurations for combining the two techniques – in-plasma photocatalysis, post-plasma photocatalysis, irradiation of photocatalyst with discharge light. It is demonstrated that the combination of the two AOTs leads to higher rate of oxidation and generation of lower concentrations of undesirable byproducts. Synergism of NTP and PCO is not due to light generated in discharge since it is too weak but can be due to the ozone and increased adsorption of intermediates on photocatalyst. The combination is promising for air purification applications but further research is needed for elucidating kinetics and mechanism of action and choosing the best photocatalyst and system geometries.
  Air purification; Corona discharge; Dielectric barrier discharge  

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