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【答案】应助回帖

gs198653(金币+5): 非常感谢 2011-12-15 18:52:00

引用回帖:

25楼: Originally posted by gs198653 at 2011-12-06 15:22:08:
现在主要问题不在22峰 22出的峰可以有办法去掉
而是10.8没有氧化石墨的峰而出现在5-6了很强的峰

给你一个我常用的方法：
GO was obtained following a modified Hummers-Offeman method . Briefly, graphite (2.0 g; Bay carbon, sp-1), sodium nitrate (1.0 g), concentrated sulfuric acid (98%, 50 ml), and potassium permanganate (6.0 g) were consistently mixed in an ice bath for 2 hours, with the mixture gradually becoming pasty and black-greenish. Next, the mixture was placed in a 35°C water bath and kept at that temperature for 30 minutes, followed by the slow addition of distilled water (100 ml) to keep the solution from effervescing; the resulting solution was placed at well below 100°C for 3 hours. With progression of the reaction, the color turned a little yellowish. After further treatment with H2O2 (5%, 100 ml), the filtered cake was washed with distilled water several times until its supernatant was without SO42-, as tested using barium chloride (0.1 mM). Then the cake was dispersed in water for further ultra-sonication for 1 hour. Of note, for facilitating the following experiments, we selected solutions with GO sheets centrifuged at speeds ranging from 1000 to 10,000 rpm, with a concentration and pH value of approximately 0.48% and 3.1, respectively.