八面体结构ZnGa_2O_4微晶的制备及其光催化性能

Preparation and Photocatalytic Properties of the Octahedral ZnGa_2O_4 Crystallites

以乙酸锌和氧化镓为反应原料,以乙二胺四乙酸(EDTA)为配位剂,采用溶胶-凝胶法制备了八面体结构的ZnGa2O4微晶。通过TG-DSC,XRD、SEM等分析方法对ZnGa2O4微晶进行了测试和表征。研究了其物相组成、显微结构、形成机理及光催化性能。结果表明,在700℃、4～6 h时可以成功制备出八面体结构的ZnGa2O4单晶,其暴露的晶面族{111};八面体结构ZnGa2O4的合成是一个受ZnO的产生速率所控制的过程;光催化降解罗丹明B的实验表明,八面体结构ZnGa2O4微晶有着较好的光催化性能。

The octahedral ZnGa2O4 crystallines were synthesized using a EDTA complexation sol-gel process including the zinc acetate and gallium oxide, with the ethylenediamine tetraacetate for complexing agent. The crystalline phase, compositions, morphology, microstructure of the ZnGa2O4 are characterized by Thermogravimetry and Differential Scanning Caborimetry （TG-DSC）, X-ray diffraction （XRD） and Scanning Electron Microscopy （SEM） measurements. Results indicate that the single crystalline of ZnGa2O4 with the octahedral structure can be obtained at calcining temperature of 700 ℃ from 4 h to 6 h; The preparation process of ZnGa2O4 with the octahedral structure is controlled by the generating rate of ZnO. The degradation of rhodamine B shows that octahedral ZnGa2O4 crystallites have good photocatalytic performance.