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gaoxin6825鐵桿木蟲 (著名寫手)
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[交流]
氧化石墨的制備問題 已有3人參與
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我是采用這種方法做的氧化石墨但是有時(shí)會(huì)出現(xiàn)氧化不完全的問題,希望和大家交流一下看看哪里需要注意 1.0g of NaNO3,1g of graphite and 50ml of H2SO4 in a 500ml flask were stirred together in an ice-water bath for 15min. Next, 6.0g of KMnO4 was slowly added in an ice bath to yield a purple-green mixture. Be careful the temperature not over 20℃.After the ice bath was removed, the mixture was stired in a 35±5℃ water bath for 1 h, forming a thick paste. Next, 40 ml of distilled water was added slowly to cause an increase in temperature to 90±5℃ and the mixture was stirred at the temperature for 30 min. Finally, 100 mL of distilled water was added, followed by the slow addition of 6 ml of H2O2 (30wt%), turning the color of the solution from dark brown to bright yellow. 還有就是最后離心洗滌時(shí),到底是要上清液,還是要沉淀。我看過一些文獻(xiàn)上清液和沉淀都有 |
木蟲 (著名寫手)
木蟲 (著名寫手)
鐵桿木蟲 (著名寫手)
木蟲 (正式寫手)

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