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Fe_3O_4,提高反应温度或延长反应时间均有利于Fe_3O_4向α-Fe_2O_3的转变.然而,柠檬酸铁在无氧气氛的热解产物为Fe_3O_4与无定形热解炭,增加反应温度和/或延长反应时间会促进Fe_3O_4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 Fe_3O_4,the transformation of α-Fe_2O_3 from Fe_3O_4 is enhanced with increasing reaction temperature or prolonging reaction time;while,the pyrolytic products under non-oxide atmosphere are Fe_3O_4 and amorphous carbon,the redox reaction between Fe_3O_4 and amorphous carbon is promoted by increasing reaction temperature or prolonging reaction time.
参考文献
| [1] | 刘祥萱,王煊军,刘振玉,朱明,李游.制备方法对纳米氧化铁晶型的影响[J].火炸药学报,2002(04):85-86. |
| [2] | 牟方志,官建国,樊希安,王维,童国秀,李维.四氧化三铁中空/螺旋纤维的制备及形成机理[J].高等学校化学学报,2008(09):1707-1711. |
| [3] | Xu XL.;Wang YZ.;Guo JD. .A novel technique by the citrate pyrolysis for preparation of iron oxide nanoparticles[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2000(2):207-209. |
| [4] | 严新.固相法制备氧化铁纳米粒子[J].盐城工学院学报(自然科学版),2002(04):24-26. |
| [5] | 杨玉东;宋志伟;梁勇 .[J].物理化学学报,2005,18:605-608. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%