Photocatalysts with higher photocatalytic performance under visible light irradiation have been desired for many applications, such as water and air purification, solar cell and water splitting into H₂ and O₂. In the present study, Ag₂W₂O₇ and Ag₂WO₄ are synthesized and investigated. Ag₂O (Kanto Chemical: 99.0%) and WO₃ (Kanto Chemical: 99.0%) were mixed with ethanol in a stoichiometric ratio. The mixtures were pressed into pellets at 400kg/cm² and calcined at temperatures from 400 to 650℃ in air for 20h. The calcines were grounded and pelletized again for heating at the same calcination temperatures from 400 to 650℃. Characterization of the compounds was carried out by XRD, SEM. Photocatalytic activity of the compounds was evaluated from measurements of decomposition of mechylene blue and acetaldehyde under irradiation of black light, fluorescent light and in dark. For the methylene blue decomposition experiment, 0.10g of photocatalyst was suspended in 50 mL mechylene blue solution with concentration 10mg/dm³. And for acetaldehyde decomposition experiment, 0.5g of photocatalyst was put in pyrex glass container with 1000 cm³ in volume. And acetaldehyde was injected into the container with microsyringe so that concentration of acetaldehyde became 40 ppm. The solution and the container were exposed to irradiation of lights for various times.

XRD measurement revealed that Ag₂W₂O₇ and Ag₂WO₄ were synthesized as single phase by calcination at temperatures from 450 to 650℃ and at 400-600℃, respectively. Ag₂W₂O₇ synthesized at 600℃ and 550℃showed excellent methylene blue decomposition performance under irradiation of black light and fluorescent light. The compounds decomposed acetaldehyde from 40ppm to 18ppm and from 40ppm to 28ppm under black light and fluorescent light irradiations, respectively. Ag₂WO₄ showed poor performance for methylene blue decomposition. The compounds decomposed acetaldehyde from 40ppm to 28ppm and from 40ppm to 29ppm under black light and fluorescent light irradiations, respectively.

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