不同气氛下柠檬酸铁制备铁氧化物的研究

Studies on the synthesize iron oxide from ferric citrate under different atmosphere

以柠檬酸铁为原料,分别在富氧和无氧气氛中经热处理得到铁氧化物,利用TG技术研究了柠檬酸铁在不同气氛下的热解过程,采用XRD技术研究了不同气氛下柠檬酸铁反应温度与反应时间对产物组分、结构的关系。结果表明:柠檬酸铁在空气气氛的热解产物为Fe3O4,提高反应温度或延长反应时间均有利于Fe3O4向α-Fe2O3的转变。然而,柠檬酸铁在无氧气氛的热解产物为Fe3O4与无定形热解炭,增加反应温度和/或延长反应时间会促进Fe3O4向Fe、FeO的转变。

Iron oxides were prepared by heat-treating ferric citrate under rich-oxide and non-oxide atmosphere.The pyrogenations of ferric citrate at different atmospheres were characterized by the technique of TG.The relation between the reaction temperature ＆ reaction time of pyrolyze ferric citrate and the composition,structure of iron oxide were studied by XRD.The results show that the pyrolytic products under air atmosphere are Fe3O4,the transformation of α-Fe2O3 from Fe3O4 is enhanced with increasing reaction temperature or prolonging reaction time;while,the pyrolytic products under non-oxide atmosphere are Fe3O4 and amorphous carbon,the redox reaction between Fe3O4 and amorphous carbon is promoted by increasing reaction temperature or prolonging reaction time.