Problem to be solved: to provide an air purifier and a purification method in which ultraviolet rays of a sufficient light intensity are irradiated to titanium dioxide, the photocatalytic activity is sufficiently expressed, and VOC is oxidized and decomposed.Solution: quickly withdraw harmful gas 10 to the attracting force of particles having high adsorption performance to support the titanium oxide film on reaction tube 7 filled with titanium oxide coated particles 3 having a short diameter of 2 to 5 mm coated with titanium oxide thickness of about 1 to 30 An air purifying apparatus for irradiating the surface of the titanium oxide with a sufficient light intensity per unit surface area to irradiate the surface of the titanium oxide to excite the photocatalyst and thereby decomposing the catalyst while the harmful gas diffuses the photocatalyst film.In order to facilitate the movement of VOC to the photocatalytic surface of the body 10, the boundary film diffusion resistance occurring near the surface of the photocatalyst was removed at a line flow rate of 5 m \/ s or more, and the ultraviolet ray was applied to the coated particle surface area of the titanium oxide with a light intensity of 1.0 MW \/ cm. Sup. 2 The method of treating the harmful gas containing gas that is irradiated as described above and decomposes the harmful gas concentration into the concentration below the environmental indicator value.Diagram【課題】十分な光強度の紫外線が酸化チタンへ照射され、光触媒活性が十分に発現され、VOCが酸化分解される空気浄化装置及び浄化方法の提供。【解決手段】粒子表面に酸化チタンを厚み約1~30μmで被覆した短径2~5mmの酸化チタン被覆粒子3を充填した反応管7に、酸化チタン膜を支持する吸着性能の高い粒子の誘引力に、有害ガス10を迅速に引き寄せるとともに、単位表面積当たりに十分な光強度の紫外線を酸化チタン表面へ照射して光触媒を励起し、有害ガスが光触媒膜を拡散する間にその分解処理を行う空気浄化装置。流体10本体中のVOCの光触媒表面への移動を容易にするため、ガス通路5の線流速を5m/s以上で、光触媒表面近傍に生じる境膜拡散抵抗を除去し、紫外線を酸化チタンの被覆粒子表面積当り、の光強度を1.0mW/cm2以上として照射し、有害ガス濃度を環境指針値以下の濃度まで分解処理する、有害ガス含有ガスの処理方法。【選択図】図1
