Air Purification Effect of Positively and Negatively Charged Ions Generated by Discharge Plasma at Atmospheric Pressure

Abstract

In this paper, the air purification effect of positively and negatively charged ions generated by discharge plasma at atmospheric pressure is reported. We have developed a novel ion generation device which consists of a cylindrical glass tube and attached inner and outer mesh electrodes. With the application of AC voltage between the electrodes, positively charged ions and negatively charged ions have been generated at atmospheric pressure. The ion densities of 3.0×104–7.0×104 counts/cm3 have been obtained with the AC voltage of 1.8–2.3 kV (effective value). We have examined the air purification properties of this device. By the operation of this device, the initial oxygen nitride (NO) density of 10 ppm in 1 m3 (in cigarette smoke) was decreased to 1 ppm after 30 min. The number of suspended germs in air has been significantly reduced by the use of this type of ion generation device.

Decrease in the Allergenicity of Japanese Cedar Pollen Allergen by Treatment with Positive and Negative Cluster Ions

“…The molecular structures of the plasma cluster ions generated were identified as H 3 O + (H 2 O) m and O 2 – (H 2 O) n (m, n ≥ 0) as the major ions [31, 42] , while ozone and the other ions were negligible [29,30,31]. The rate of decrease in in vitro antigenic activities (fig.…”

“…In this study we used an ion generation device attached to a domestic air cleaner (Sharp, Osaka, Japan) as described by Nishikawa and colleagues [29,30,31]. The device consisted of a ceramic dielectric plate, a high-voltage applied electrode, and a ground electrode.…”

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

“…The reasons for this include: people spend the majority of their time indoors; there is a wide and varied range of emission sources indoors; and for certain kinds of pollutant, e.g., formaldehyde and environmental tobacco smoke (ETS), the concentration levels are always higher in indoors compared with outdoors. Various of control technologies, such as filtration (Klimov et al, 2009), adsorption (Jee et al, 2005), ionization (Nishikawa and Nojima, 2001), ozone oxidation (Huang et al, 2012), etc., have been used for indoor air purification of different pollutants.…”

Bactericidal action of lemon grass oil vapors and negative air ions

“…Such evidences suggest that the home as well as working environment could be an important source of infectious diseases and necessitates the development of suitable disinfection techniques (Larson & Gomez-Duarte, 2001). In recent years, new air purification and disinfection technologies (Plasma Cluster Ion technology) have been developed based on the application of positive and negative ions (Digel et al, 2005;Nishikawa & Nojima, 2001;Seo, Mitchell, Holt, & Gast, 2001). There is a great potential for utilization of NAI generators in preventing decay of fruits and vegetables (Hildebrand, Song, Forney, Renderos, & Ryan, 2001), reducing the ambient air microbial load (Tanimura, Nakatsugawa, Ota, & Hirotsugi, 1997) and hospital acquired infections in clinics (Gabby, Bergerson, Levim, Brenner, & Eli, 1990;Kerr et al, 2006), as well as preventing the spread of diseases in animal houses (Estola, Makela, & Hovi, 1979).…”