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jj爱笑的眼睛

新虫 (初入文坛)

[求助] 求助利用石墨制备 氧化石墨烯的问题

我用的1g石墨,加入到0度的175ML浓硫酸中,搅拌,加入10g 高锰酸钾,1.5g硝酸钠,之后溶液变为深绿色,在30摄氏度保温了20分钟。加入了250ML去离子水,溶液有深绿色变为砖红色和棕红色,放出大量的热,产生紫色烟雾,在98摄氏度保温了30分钟,有磁力搅拌。然后加入了250ml 去离子水和20ML30%双氧水。但是结果是溶液变成了黑色 ,静置后没有分层,有沉淀,沉淀有点发黄。这是怎么回事啊  求助啊~~~
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guxue

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【答案】应助回帖

感谢参与,应助指数 +1
理解错误,氧化后,还需超声处理分层。氧化的目的是在层间加入东西,有利于后期分层。
青出于蓝而胜于蓝
2楼2013-03-26 17:00:30
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jj爱笑的眼睛

新虫 (初入文坛)

引用回帖:
2楼: Originally posted by guxue at 2013-03-26 17:00:30
理解错误,氧化后,还需超声处理分层。氧化的目的是在层间加入东西,有利于后期分层。

嗯 我是按这个方法做的 可是就一步步的结果来看 跟这个相差很大是怎么回事?natural graphite powder (2.0 g) was added to cooled (0 ◦C)  H2SO4 (350 ml). Then, KMnO4 (20 g) and NaNO3 (3 g) were added gradually while stirring. The mixture was then  transferred to a 30◦C water bath and stirred for 20 min. Deionized  water (250 ml) was slowly added and the temperature  was increased to 98 ◦C. The mixture was maintained at that  temperature for 30 min. The reaction was terminated by adding de-ionized water (500 ml) followed by adding H2O2 solution (40 ml, 30%). The color of the mixture changed to brilliant yellow, indicating the oxidation of pristine graphite to  GO. Then, the mixture was filtered and washed with diluted HCl to remove metal ions. Finally, the product was washed repeatedly with distilled water until the pH was seven. The sample of GO was obtained after drying. To prepare the  GONS, the as-obtained GO was re-dispersed in distilled water。
3楼2013-03-26 19:07:29
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