Air purifier and method of purifying air

An air purifier comprising:

• a reactor having a hollow shape extending in a predetermined direction;
• a discharge plasma generator which includes a first electrode disposed on an outer wall of the reactor and a second electrode disposed inside the reactor, and generates discharge plasma in a predetermined discharge region;
• a plurality of dielectric particles disposed in a packed-bed of the reactor;
• a gas-liquid contact unit disposed at a front end of the reactor;
• and
• a fluid mixer disposed at a front end of the gas-liquid contact unit;
• wherein the fluid mixer comprises a liquid supply unit which supplies fine droplets to a polluted air,
• wherein the fluid mixer is configured to mix the fine droplets with the polluted air to a gas-liquid mixed fluid air,
• wherein the gas-liquid contact unit is configured to separates the gas-liquid mixed fluid air into a first purified air and a liquid,
• wherein at least one micro-channel is defined in at least one dielectric particle of the plurality of dielectric particles and
• the plurality of dielectric particles has a relative density of about 30 percent or more and about 90 percent or less compared to a reference density of the plurality of dielectric particles in the packed-bed in which the at least one micro-channel is not defined.