煅烧温度对络合溶胶-凝胶法制备ZnGa2O4微晶形貌及光催化性能的影响

采用EDTA络合溶胶-凝胶法制备了尖晶石结构的ZnGa2O4微晶.通过XRD、SEM等分析方法对ZnGa2O4微晶进行了测试和表征.研究了不同煅烧温度对其物相组成、显微结构及光催化性能的影响.结果表明,以乙酸锌和氧化镓为反应原料,以乙二胺四乙酸为络合剂,在650～800℃能合成单一物相的ZnGa2O4微晶.在700℃时可以成功制备八面体形的ZnGa2O4微晶,在800℃时可以合成棒状的ZnGa2O4微晶；随着温度从650～800℃逐渐升高,其对罗丹明B的光催化降解性能逐渐提高.

Influence of the Calcination Temperature on the Morphology and Photocatalytic Activity of ZnGa2O4 Crystallites Prepared by EDTA Complexation Sol-gel Process

The spinel structure of ZnGa2O4 crystallites were synthesized using a EDTA complexation sol-gel process.The as-prepared samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).The effects of calcination temperature on the microstructure and the photocatalytic activity were investigated.The results show that using the zinc acetate and gallium oxide,with the ethylenediamine tetraacetate for complexing agent,the ZnGa2O4 crystallites could be obtained at calcination temperature of 650-800 ℃.The samples exhibit the octahedral structure at 700 ℃ and rodlike morphology at 800 ℃.As the temperature increased from 650 ℃ to 800 ℃,its photocatalytic performance for degradation of rhodamine B is advanced.