A photocatalytic
air treatment system, including apparatuses and methods, for killing and / or mineralizing
bacteria, viruses, mold, fungi, spores, mycotoxins, allergens, and other similar microorganisms or agents, and for oxidizing volatile organic compounds (VOCs). The
system comprises one or more reactor beds configured in one or more stages with each reactor
bed including a plurality of photocatalyst coated media substantially surrounding a plurality of sheathed
ultraviolet light sources that may be arranged in a plurality of configurations. Adjacent
ultraviolet light sources are positioned so as to create killing zones of photocatalyst coated media therebetween that are irradiated with
ultraviolet light from multiple sources and in which an increased number of hydroxyl radicals are present. The photocatalyst generally comprises
titanium dioxide, but may include one or more enhancers. The media is formed from or is coated with a material that induces the photocatalyst to form a nano-particle structure.