Improved Synthesis of Graphene Oxide这篇文章中下面这段话不知道做过的人具体是怎么做的，希望得到大家的帮助，我没做过合成。
如果通过抽滤，氧化石墨烯是在滤液中还是在滤渣中，我都弄不清楚了。
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.
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