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52王倩木蟲 (著名寫手)
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[求助]
關(guān)于Hummer‘s法制備氧化石墨的問題 已有1人參與
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1、預(yù)氧化時加入H2SO4、K2S2O8、P2O5、作用分別是什么,最好有反應(yīng)方程式 2、預(yù)氧化時把石墨烯加入上述三者的溶液中時為什么會溫度躥升?過一會溫度又降低? 3、預(yù)氧化的石墨烯為什么要用去離子水洗凈殘留的酸?后面Hummer's法中的溶液也是H2SO4啊,應(yīng)該沒有影響才對啊 4、Hummer's法中用到H2SO4、KMnO4,為什么很多文獻(xiàn)都用到NaNO3啊?它們分別有什么作用啊 5、用1:10的HCl洗滌的作用是去除金屬離子和硫酸根, 難道HCl和這兩種離子能反應(yīng)?如果不是的話為甚么不用去離子水洗滌呢? |
氧化石墨烯(Graphene Oxide) | 石墨烯 |
木蟲 (著名寫手)
堡頭


木蟲 (小有名氣)
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Graphite oxide was synthesized from natural graphite powder using the modified Hummers’ method[20]. Typically, 10 g of graphite powders were added into 230 mL of 98 wt% H2SO4, followed by an intense stir for 5 min at room temperature, then 30 g of KMnO4 was introduced into the mixture. Under continuously vigorous stirring, the mixture was kept under low (10e15 C), middle (35 3 C) and high (98 C) temperatures for 2 h, 30 min, and 30 min reactive stages, respectively. Subsequently, 230 mL of diluted H2O2 (5 wt%) was added into the above mixture. Finally, the suspension was vacuum filtrated using 460 mL of deionized water and 300 mL of diluted HCl (5 wt%). BaCl2 aqueous solution was used to test whether the filtration solution contained SO4 2, and NaOH (5 mol/L) was added to produce flocculation. The resulting products were centrifuged, followed by drying at 50 C in an oven. |

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