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这是典型的共沉淀法做超顺磁铁氧体，文献中的方法描述如下： Briefly, solutions of FeCl3·6H2O (0.086 M) and FeCl2·4H2O (0.043 M) were mixed and precipitated with concentrated ammonia while stirring vigorously. The black precipitate, which immediately formed was washed several times with ultra-pure water until the pH decreased from 10 to 7. The solid was collected and refluxed in a mixture of 0.8 M nitric acid and 0.21 M aqueous Fe(NO3)3·9H2O for 1 h. During this step the initial black slurry turned brown and the formation of nitric oxide could be observed. The system was allowed to cool to room temperature, the remaining liquid was discarded, and 100 ml of ultra-pure water was added to the slurry mixture, which immediately dispersed. The brown suspension was dialyzed for 2 days against 0.01 M nitric acid, and stored at 4°C. 请问：1、粒子生成后加入硝酸和硝酸铁中回流，意义何在？ 2、接下来用0.01M硝酸透析的步骤目的何在？为何要用酸来透析？ [search]透析[/search] |
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7楼2007-08-01 09:13:09
youjinsong
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2楼2007-07-24 17:08:04
| 先用共沉淀已经作出Fe3O4 又回流是为了增加结精度 但文献中产品变了色应该是氧化了 文献的产品是Fe3O4还是Fe2O3？ 你能把原文献发我一份吗？ tnt167@sohu.com |
3楼2007-07-25 08:13:14
4楼2007-07-25 14:02:45