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[求助]
修正hummers合成氧化石墨
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请各位能否帮我看下步骤是否正确 尤其是细节部分 希望能够指出并修正 1在冰水浴中装配好250ml反应瓶 2加入浓H2SO4（一般加多少ml） 搅拌下加入2g石墨粉和1g硝酸纳固体混合物 3缓慢加入6gKMnO4（温度不超过10度） 4在冰水浴条件下搅拌2h取出 室温搅拌反应5天 5将样品用H2SO4稀释 搅拌2h 6加入6mlH2O2 搅拌2h 7用H2SO4,H2O2混合物及HCl反复洗涤 用蒸馏水再洗涤 得沉淀GO |
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18楼2015-01-17 09:24:58
javas2010
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lchpy(金币+1): thanks for your information 2011-11-11 08:13:20
lchpy(金币+1): thanks for your information 2011-11-11 08:13:20
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兄弟可以试试这个配方，我们实验室一直这样做的（具体的细节自己控制） 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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4楼2011-11-11 16:52:21