Abstract
Gaseous ammonia has a characteristic pungent odor and its high concentration gas is harmful for human health. For the removal of ammonia from indoor air, its photocatalytic decomposition is expected to be effective. In this work, the composite photocatalysts which consist of TiO2 and tungstphosphoric acid as a solid acid were prepared and their adsorption and photocatalytic decomposition properties against gaseous ammonia were investigated. The composite exhibited 3.5 times of ammonia adsorption capacity larger than that of TiO2. The decomposition rate of ammonia by the composite was almost the same of that of TiO2 however the amount of ammonia on the composites were largely decreased.
