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07231210金蟲 (小有名氣)
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[求助]
Improved Synthesis of Graphene Oxide制備氧化石墨烯,急求 已有1人參與
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Sample Text 有沒有人用Improved Synthesis of Graphene Oxide做過實(shí)驗(yàn)啊,需不需要用冰浴加料啊,急急急!萬分感謝! For the improved method, a 9:1 mixture of concentrated H2SO4/H3PO4 (360:40 mL) was added to a mixture of graphite flakes (3.0 g, 1 wt equiv) and KMnO4 (18.0 g, 6 wt equiv), producing a slight exotherm to 35_40 °C. The reaction was then heated to 50 °C and stirred for 12 h. The reaction was cooled to rt and poured onto ice (_400 mL) with 30% H2O2 (3 mL). For workup, the mixture was sifted through a metal U.S. Standard testing sieve (W.S. Tyler, 300 _m) and then filtered through polyester fiber (Carpenter Co.) The filtrate was centrifuged (4000 rpm for 4 h), and the supernatant was decanted away. The remaining solid material was then washed in succession with 200 mL of water, 200 mL of 30% HCl, and 200 mL of ethanol (2_); for each wash, the mixture was sifted through the U.S. Standard testing sieve and then filtered through polyester fiber with the filtrate being centrifuged (4000 rpm for 4 h) and the supernatant decanted away. The material remaining after this extended, multiple-wash process was coagulated with 200 mL of ether, and the resulting suspension was filtered over a PTFE membrane with a 0.45 _m pore size. The solid obtained on the filter was vacuum-dried overnight at room temperature, obtaining 5.8 g of product. |
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