首先采用水热法在FTO衬底上制备出α-GaOOH纳米柱阵列, 再以α-GaOOH纳米柱/FTO结构作为前驱体进行水热反应, 经溶解再结晶过程, α-GaOOH纳米柱可转变为边长约为500 nm的ZnGa2O4纳米立方块。在模拟太阳光源辐照下的一系列光催化实验结果表明：样品对亚甲基蓝具有较强的吸附作用和较高的光催化活性, 对罗丹明B、刚果红的吸附能力和光催化作用都很弱, 对甲基橙只有较弱的光催化作用；H2O2可以作为电子捕捉剂和供氧剂, 促进样品的导带电子参与活性自由基的形成, 使样品对染料表现出持续较高的光催化活性。

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.