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Improved Synthesis of Graphene Oxide制备氧化石墨烯，急求已有1人参与
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Sample Text 有没有人用Improved Synthesis of Graphene Oxide做过实验啊，需不需要用冰浴加料啊，急急急！万分感谢！ 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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5楼2012-10-16 16:06:58
xiejf
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2楼2012-09-18 20:42:56
3楼2012-09-19 08:23:33
xiejf
专家顾问 (文学泰斗)
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4楼2012-09-19 09:03:07