应《网络安全法》要求，自2017年10月1日起，未进行实名认证将不得使用互联网跟帖服务。为保障您的帐号能够正常使用，请尽快对帐号进行手机号验证，感谢您的理解与支持！

24小时热门版块排行榜    

小木虫论坛-学术科研互动平台 » 材料区 » 微米和纳米 » 合成表征 » 求助：经典Hummers法合成氧化石墨，最后加双氧水，怎么不变黄色？
132/2返回列表上一页12
查看: 2870  |  回复: 12
只看楼主 @他人 存档 新回复提醒 (忽略) 收藏    在APP中查看

396533450

金虫 (正式写手)

猫咪宝贝

【答案】应助回帖

感谢参与，应助指数 +1
加双氧水是停止水浴之后，迅速加进去的，反应很迅速，立马就变金黄色了！
赞一下 回复此楼
11楼2012-05-04 09:23:14
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

swllover

铁杆木虫 (著名写手)

【答案】应助回帖

感谢参与，应助指数 +1
The Hummers method with minor modification was used for the preparation of GOs from graphite. Briefly, to the concentrated H2SO4(10 mL) in a flask at 80 °C were added (NH4)2S2O8 (0.9 g) and P2O5(0.9 g), and the mixture was stirred until the reagents were completely dissolved. Graphite (1 g) was added, and the resulting mixture was allowed to react at 80 °C for 4.5 h. Upon being cooled to room temperature, the reaction mixture was diluted with water (250 mL) and kept for ∼12 h. It was then filtered and washed repeatedly with water, followed by drying in a vacuum oven. The solid sample was added to concentrated H2SO4 (40 mL) in a flask cooled in an ice bath. To the mixture in the flask was added slowly KMnO4(5 g over 40 min), during which the temperature was kept at <10 °C. The resulting mixture, with a change in color from black to greenish-brown, was heated at 35 °C for 2 h, followed by dilution with water (85 mL; Caution!the temperature must be kept at <35 °C throughout!) and further stirring for 2 h. The reaction mixture was poured into a large
beaker, to which water (250 mL) and then aqueous H2O2
(30%,10 mL) were added. Bubbles from the aqueous mixture along with a color change to brilliant yellow were observed. The mixture was allowed to settle for ∼12 h. The clear supernatant was decanted, and the sediment was washed repeatedly with an aqueous H2SO4 (5 wt %), H2O2(0.5 wt %), and HCl (10 wt%) solution, followed by washing repeatedly with water until no layers were observed in the centrifugation. The sample was then dialyzed (MWCO ∼ 3500) against water for 7 days to yield a clean aqueous dispersion of GOs
赞一下 回复此楼
不必遗憾。若是美好，叫做精彩。若是糟糕，叫做经历。
12楼2012-05-04 20:55:47
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

1559349638

银虫 (著名写手)
引用回帖:
12楼: Originally posted by swllover at 2012-05-04 20:55:47:
The Hummers method with minor modification was used for the preparation of GOs from graphite. Briefly, to the concentrated H2SO4(10 mL) in a flask at 80 °C were added (NH4)2S2O8 (0.9 g) and P2O5(0 ...

thank you!如题，我问的是经典的，不是改进的！氧化石墨可以合成完全没有问题，但是要用经典的HUMMER法。
赞一下 回复此楼
The so-called turning-around is that u not only miss the sun in day time but also the stars at night.
13楼2012-05-04 23:28:28
已阅   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 1559349638 的主题更新
132/2返回列表上一页12
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[基金申请] 2026年8月25日国自然放榜前突然收到列入评审专家邮件，有关系吗？ +3 木水思豆 2026-08-25 3/150 2026-08-25 20:49 by iwuli
[基金申请] 今天务委会开完了，明天出结果吗 +14 angus9576 2026-08-25 17/850 2026-08-25 20:24 by huagongfeihu
[基金申请] 明天应该可查了！？ +6 chengyan1220 2026-08-23 6/300 2026-08-25 19:45 by zfd97
[基金申请] 放榜前的不淡定 20+4 snowwithsea 2026-08-19 19/950 2026-08-25 17:57 by chick875
[基金申请] 某些机构，以效率低为荣，以效率低作为存在感 +9 yuleib84 2026-08-25 10/500 2026-08-25 17:14 by alexon
[基金申请] 今日不放榜？网传国自然预计 8 月 27 日可查结果 +17 医学老男孩 2026-08-20 22/1100 2026-08-25 15:36 by 医学老男孩
[基金申请] 什么时候开奖？ +12 CrisMessi 2026-08-18 13/650 2026-08-25 14:40 by ZJTJZ
[基金申请] 如果此刻你正在为国基感到焦虑，不妨来听听这首《基金之外》 +8 scalable 2026-08-24 8/400 2026-08-25 12:52 by jnhyjjm
[基金申请] 没有任何消息-是不是就凉了 +9 图啦图啦 2026-08-24 10/500 2026-08-25 11:59 by 南海小哥
[基金申请] 今天基金会出结果吗？20260819 +17 kkkl_v 2026-08-19 18/900 2026-08-25 09:41 by windflowerwy
[基金申请] 我面上完蛋了 +13 且听虎啸 2026-08-20 14/700 2026-08-25 09:10 by mrkang
[基金申请] 范进中举一文的中心思想 +7 炎黄贵胄 2026-08-22 8/400 2026-08-25 08:48 by ZJTJZ
[基金申请] 只有每年这种时候来逛逛小木虫 +25 yaoyewhu2008 2026-08-20 27/1350 2026-08-25 08:01 by Equinoxhua
[基金申请] 建议基金发布提前给出明确的时间点 +13 kulium 2026-08-21 16/800 2026-08-24 16:27 by superceng
[基金申请] 让我中一个面上吧！ +13 大萍1987 2026-08-20 16/800 2026-08-24 10:23 by 太傻了
[基金申请] 科研孤儿太难了 +18 我4大白菜 2026-08-20 19/950 2026-08-24 09:47 by 凯恩广盛催化分�
[教师之家] 跳槽后在研项目怎么办？ +5 简单化xn 2026-08-22 10/500 2026-08-23 12:38 by 简单化xn
[基金申请] 看来今天不会放榜了？ +8 chengyan1220 2026-08-21 11/550 2026-08-21 17:52 by dcqxinyang
[基金申请] 时间戳又变了 +13 wuchongjun 2026-08-20 19/950 2026-08-21 17:21 by 紫杉醇
[基金申请] 今天放榜没戏了吧 +9 yuleib84 2026-08-19 11/550 2026-08-21 10:06 by gltch
信息提示
关闭
请填处理意见
关闭