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dxyan木蟲 (正式寫手)
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[求助]
MIL-101的合成及純化
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采用不用HF合成MIL-101(Cr),參考文獻(xiàn):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小時(shí),70度,但是比表面積也就2400。DMF洗滌后也用甲醇,丙酮各洗過3,4次。但是BET依舊不行,吸附儀活化也達(dá)到足夠的時(shí)間。合成完后釜壁面有灰色的一層,在各種溶劑洗的過程中離心完后離心管底部有層灰色的,但是大部分是綠色。誰能幫忙分析一下會(huì)是什么原因。原料或者釜的原因嗎?加HF酸的方法也試過了,水洗醇洗后,加入氟化銨,然后再水洗,醇洗。但是比表面都2000以下。氟化銨交換2次,BET才達(dá)到2200。求各位幫忙分析一下,謝謝! 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, |
鐵蟲 (初入文壇)
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