立方纳米结构ZnGa₂O₄的制备及光催化性质

α-GaOOH nanorod arrays on FTO substrates are synthesized by a simple hydrothermal method for the first time, which can be used as a precursor and converted via hydrothermal reaction into ZnGa₂O₄ nanocubes due to a dissolution-recrystallization process. The characterization results of samples indicate that as-prepared ZnGa₂O₄ on FTO belongs to cubic system and has the cubic morpohology with the size of about 500 nm. A series of photocatalytic experiments have been performed under simulated sunlight irradiation and the results indicate that ZnGa₂O₄ nanocubes show both enhanced adsorption and photocatalytic abilities for methylene blue compared with rhodamine B and congo red, and only show weak photocatalytic activity for methyl orange. As electron scavenger and oxygen provider, H₂O₂ can facilitate the formation of free radicals with high chemical reactivity and make as-prepared samples possess continuous and enhanced photocatalytic activity of dyes.