PROBLEM TO BE SOLVED: To prevent anatase type titanium oxide to be a photocatalyst from being removed by firmly supporting it when decomposing a contaminant by exciting the photocatalyst with plasma, and also to dramatically improve efficiency in a cleaning treatment by the photocatalyst by increasing an opportunity to be brought into contact with the photocatalyst.SOLUTION: A photocatalyst filter (F) is arranged in a plasma generation space (4) to be an air flow passage (2). The photocatalyst filter (F) includes one or more sheets of filter elements (E) where photocatalyst layers (15) are formed by burning anatase type titanium oxide particles in titanium mesh (14) in which a large number of fine flow passages (12) to be vent holes are formed in titanium foil (11) and also, on the front surfaces, titanium oxide base layers (13) by anodic oxide films are formed. Periodic or randomly periodic projections/recessions where the titanium mesh (14) is formed by bending or pressing are formed in at least one sheet of filter element (E).COPYRIGHT: (C)2012,JPO&INPIT【課題】光触媒をプラズマで励起させて汚染物質を分解する際に、光触媒となるアナターゼ型酸化チタンを強固に担持させて剥がれを防止し、さらに、光触媒に接する機会を増大させて、光触媒による浄化処理効率を格段に向上させる。【解決手段】空気流路(2)となるプラズマ発生空間(4)内に光触媒フィルタ(F)が配され,光触媒フィルタ(F)は、チタン箔(11)に通気孔となる多数の微細流路(12)が形成されると共にその表面に陽極酸化皮膜による酸化チタンベース層(13)を形成したチタンメッシュ(14)にアナターゼ型酸化チタン粒子を焼き付けて光触媒層(15)を形成した一枚以上のフィルタエレメント(E)を備え、少なくとも一のフィルタエレメント(E)に、チタンメッシュ(14)を折曲成形又はプレス成形した周期的又はランダム周期の起伏を形成した。【選択図】図1
