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| Reagents were all of AR grade. Water used in the synthesis and washing was deionized. Graphite oxide was prepared from natural graphite powder by a modification of Hummers method.[17] One gram of graphite powder was added to 23 mL of cooled (0°C) concentrated H2SO4。Three temperature of the mixture was maintained below 20°C. The mixture was then stirred at 35°C for 30 min. 46 mL of distilled water was slowly added to cause an increase in temperature to 98°C, and the mixture was maintained at that temperature for 15 min. The reaction was terminated by adding 140 mL of distilled water followed by 10 mL of 30% H2O2 solution. The solid product was separated by centrifugation, washed repeatedly with 5% HCl solution until sulfate could not be detected with BaCl2, and then washed 3-4 times with ethanol and dried in vacuum at 60°C overnight. |
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phu_grassman
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快樂島、布吉島島主
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lofed: 金幣+10, 翻譯EPI+1, ★★★★★最佳答案, 非常感謝！ 2013-12-27 11:28:47
lofed: 金幣+10, 翻譯EPI+1, ★★★★★最佳答案, 非常感謝！ 2013-12-27 11:28:47
| 實驗中所有的試劑均是分析純。合成和洗滌過程中所用的為去離子水。氧化石墨烯由天然石墨粉末通過改進的Hummer法制得。1 g石墨粉末加入到23 mL冷卻的濃硫酸中。（Three temperature of the mixture was maintained below 20°C. 這句沒看明白，three是不是the？）混合物的溫度保持在20度以下，然后在35度下攪拌30 min，之后緩慢加入46 mL蒸餾水使混合物溫度增加到98度，并保持在此溫度15 min。最后通過先后加入14o mL蒸餾水、1o mL30% 的雙氧水溶液使反應終止。固體產(chǎn)品通過離心分離，并用5%HCl溶液反復洗滌，直至硫酸根粒子不能通過BaCl2被檢測到。然后用乙醇洗滌3-4遍，并于60度下過夜真空干燥。 |
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