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[求助]
求助利用石墨制備 氧化石墨烯的問題
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| 我用的1g石墨,加入到0度的175ML濃硫酸中,攪拌,加入10g 高錳酸鉀,1.5g硝酸鈉,之后溶液變?yōu)樯罹G色,在30攝氏度保溫了20分鐘。加入了250ML去離子水,溶液有深綠色變?yōu)榇u紅色和棕紅色,放出大量的熱,產(chǎn)生紫色煙霧,在98攝氏度保溫了30分鐘,有磁力攪拌。然后加入了250ml 去離子水和20ML30%雙氧水。但是結(jié)果是溶液變成了黑色 ,靜置后沒有分層,有沉淀,沉淀有點(diǎn)發(fā)黃。這是怎么回事啊 求助啊~~~ |
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嗯 我是按這個(gè)方法做的 可是就一步步的結(jié)果來看 跟這個(gè)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。 |
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