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52王倩

木虫 (著名写手)

[求助] 关于Hummer‘s法制备氧化石墨的问题已有1人参与

1、预氧化时加入H2SO4、K2S2O8、P2O5、作用分别是什么,最好有反应方程式
2、预氧化时把石墨烯加入上述三者的溶液中时为什么会温度蹿升?过一会温度又降低?
3、预氧化的石墨烯为什么要用去离子水洗净残留的酸?后面Hummer's法中的溶液也是H2SO4啊,应该没有影响才对啊
4、Hummer's法中用到H2SO4、KMnO4,为什么很多文献都用到NaNO3啊?它们分别有什么作用啊
5、用1:10的HCl洗涤的作用是去除金属离子和硫酸根, 难道HCl和这两种离子能反应?如果不是的话为甚么不用去离子水洗涤呢?
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氧化石墨烯(Graphene Oxide) 石墨烯

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小小将军

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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.
justdoit
5楼2015-05-05 11:20:11
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