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dxyan

木虫 (正式写手)

[求助] MIL-101的合成及纯化

采用不用HF合成MIL-101(Cr),参考文献:Chem. Mater. 2012, 24, 166。但是做了很久比表面上不去。2200左右。其中DMF洗部分也洗了3次,每次12小时,70度,但是比表面积也就2400。DMF洗涤后也用甲醇,丙酮各洗过3,4次。但是BET依旧不行,吸附仪活化也达到足够的时间。合成完后釜壁面有灰色的一层,在各种溶剂洗的过程中离心完后离心管底部有层灰色的,但是大部分是绿色。谁能帮忙分析一下会是什么原因。原料或者釜的原因吗?加HF酸的方法也试过了,水洗醇洗后,加入氟化铵,然后再水洗,醇洗。但是比表面都2000以下。氟化铵交换2次,BET才达到2200。求各位帮忙分析一下,谢谢!
Cr(NO3)3·9H2O (1.0 g, 2.5 mmol), terephthalic acid (0.42 g, 2.5 mmol), and deionized water (10 mL) were
blended and briefly sonicated resulting in a dark blue-colored suspension. The suspension was placed in a
Teflon-lined autoclave bomb and kept in an oven at 218 °C for 18 h. After the bomb cooled down to room
temperature, the resultant fine green MIL-101 crystals were separated from water using a centrifuge and
washed with water, methanol and acetone. The suspension in acetone was centrifuged and separated, the
solids were placed in N, N-dimethylformamide (10 mL) and the suspension was sonicated for 10 min and
then kept at 70 °C overnight. The resulting solids were separated by centrifugation, repeatedly washed with
methanol and acetone, dried at 75 °C overnight,
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MephisroWW

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同问,请问楼主解决了嘛
2楼2024-11-13 21:55:13
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