Proc. 2016 Electrostatics Joint Conference 1 Nanoparticle removal and exhaust gas cleaning using a gas-liquid interfacial nonthermal plasma Tomoyuki Kuroki a *, Shunsuke Nishii a , Takuya Kuwahara b , and Masaaki Okubo a a Dept. of Mechanical Engineering Osaka Prefecture University 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan b Dept. of Products Engineering and Environmental Management Nippon Institute of Technology 4-1 Gakuendai, Miyashiro-machi, Minamisaitama, Saitama 345-8501, Japan * Corresponding author. Tel./fax : +81-72-254-9233 e-mail: kuroki@me.osakafu-u.ac.jp Abstract—The removal of air pollutants containing nanoparticles with a wet-type plasma reactor is investigated by using a gas-liquid interfacial nonthermal plasma. This reactor can simultaneously remove nanoparticles and harmful gases such as nitrogen oxides (NO x ) and sulfur oxides (SO x ). In order to evaluate the performance of this reactor, a simulated exhaust gas is prepared using polystyrene latex particles having diameters of 29, 48, 100, 202, and 309 nm, and NO / SO 2 gas cylinders. A collection efficiency of more than 99% is achieved for na- noparticles having diameters in the 27.9–216.7 nm range. Moreover, removal efficiencies of more than 99% and 77% are obtained for SO 2 and NO x , respectively. From these results, it is confirmed that this wet-type pulsed corona discharge plasma reactor is useful for the simulta- neous removal of nanoparticles, NO x , and SO x . Keywords: Air cleaner, nonthermal plasma, electrostatic precipitator, gas-liquid interface, nanoparticle, NO x , SO x . I. INTRODUCTION Particulate matter (PM), nitrogen oxides (NO x = NO + NO 2 ), and sulfur oxide (SO x = SO 2 + SO 3 ) emitted from diesel engines, thermal power generation plants, and general factories of industries have bad effect for global environment and humans. Therefore, they become a great problem, and nonthermal plasma technology is one of the important treatment method attracting attentions [1–7]. Especially, in Asia region, recently, suspended nano-sized particles in the atmosphere among the harmful air pollutants have become an international problem. PM 2.5 represents the particle having an aerodynamic diameter less than 2.5 μm.