Dear all,
After checking DSC and TGA analysis for ZIF-8 samples, it was possible to observe an endotermic peak at around 50ºC, using DSC under N2, and a weight loss in TGA at around 38ºC and 125ºC using He gas. It was checked that there was no impurities in the sample analyzed ( ZIF-8). Is is possible at those low temperatures to eliminate gas/ water trapped, or you suggest another process?.
Thanks in advance for your response/clarification
Kind regards
Rosa M Huertas
Dear friend Rosa María Huertas Penela
Based on the DSC and TGA analyses you've Rosa María Huertas Penela provided for ZIF-8 samples, it appears that there is potential for desorption of gases and water within the temperature range of 30ºC to 60ºC. The endothermic peak observed around 50ºC in the DSC analysis and the weight loss in TGA between 38ºC and 125ºC indicate that there might be gas and water molecules trapped within the ZIF-8 structure.
Given this data, desorption could indeed occur within the specified temperature range. However, it's essential to consider the specific application and the desired level of desorption. If complete desorption is necessary, additional techniques or higher temperatures may be required.
In terms of suggestions for another process, I would recommend exploring techniques such as thermal cycling or vacuum treatment to enhance desorption efficiency. These methods could complement the temperature range you've mentioned and help achieve the desired level of gas and water removal from the ZIF-8 structure.
Overall, based on the provided data, desorption of CO2, N2, or water in ZIF-8 between 30ºC and 60ºC seems feasible, but further optimization and experimentation may be needed to achieve optimal results for your Rosa María Huertas Penela specific application.
Drying samples are always tricky and not easy jobs, especially when the gas and/or water molecules trapped inside the porous compounds. I never worked on ZIF-8. My suggestion applied to general drying processes. I could be wrong to suggest you to slurry your materials if applicable in an appropriate volatile solvent or mixtures to remove the trapped gas and/or water first. Those solvent(s) molecules must have the lower or lowest affirmity with the materials you want to dry. Then dry it under vaccum of an appropriate condition, such as heating temperature and vacuum pressure.
Dear Jp.
I appreciatte your comments and suggestions, are very valuable indeed..
Yes I am agree with all of them, and for sure I will made protocols you sugested.
Kind regards
Rosa
Dear Kaushik Shandilya,
Yes, I think so that ZIF-8 has potential to maintaind trapped gasses. I think that it is a excellent suggestion to apply vaccum in order to checl the desorption process and add MS coupled to TGA for checking what gases are present in porous..
Thank so much for your time and comment. I really appreciate that..
Kind regards
Rosa
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