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麦兜520

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[求助] 合成方法工艺求教 已有2人参与

一个合成GQDs的方法里,
Preparation: GO sheets were prepared from natural graphite powder by a modified Hummers method [28,29]. GSs were obtained by thermal deoxidization of GO sheets in a tube furnace at 200–300 8C for 2 h with a heating rate of 5 8C min1 in a nitrogen atmosphere. GSs (0.05 g) were oxidized in concentrated H2SO4 (10 mL) and HNO3 (30 mL) for 15–20 h under mild ultrasonication (500 W, 40 kHz). The mixture was then diluted with deionized (DI) water (250 mL) and filtered through a 0.22-mm microporous membrane to remove the acids. Purified oxidized GSs (0.2 g) were re-dispersed in DI water (40 mL) and the pH was tuned to 8 with NaOH. The suspension was transferred to a poly(tetrafluoroethylene) (Teflon)-lined autoclave (50 mL) and heated at 200 8C for 10 h. After cooling to room temperature, the resulting black suspension was filtered through a 0.22-mm microporous membrane and a brown filter solution (yield ca. 22%) was separated. The colloidal solution still contained some large graphene nanoparticles (50–200 nm) that emitted weak blue fluorescence. So, the colloidal solution was further dialyzed in a dialysis bag (retained molecular weight: 3500 Da) overnight and GQDs that were strongly fluorescent through the bag were obtained with a yield of ca. 5%.  
So, the colloidal solution was further dialyzed in a dialysis bag (retained molecular weight: 3500 Da) overnight 。这儿说的透析用到的是什么东西呀,有其它的可以替代的操作吗?
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麦兜520

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引用回帖:
5楼: Originally posted by hg30717580 at 2016-07-20 22:58:33
可以替代 现在的膜技术就可以。 超滤 纳滤 分渗透都可以的

好,我搜搜资料看看

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6楼2016-07-21 23:55:02
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感谢参与,应助指数 +1
麦兜520: 金币+10, ★★★很有帮助, 是我在找的东西 2016-07-21 23:54:09
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2楼2016-07-19 09:24:58
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3楼2016-07-19 09:25:40
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麦兜520

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明亮的眼眸: 请及时给2楼评分,谢谢。 2016-07-20 22:28:54
引用回帖:
3楼: Originally posted by 古德里安 at 2016-07-19 09:25:40
http://8944.net/img/3/01f378ef791e968555.jpg

见示意图。...

嗯,后来搜了些资料了解了一些,准备联系买半透膜和一些耗材做实验。

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4楼2016-07-19 18:10:34
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