We performed a few TGA measurements on MOFs and faced severe contamination of crucibles at the end of the tests. Please let us know an effective cleaning procedure to follow. We tried Aqua regia and it could not effectively clean the crucibles. Earlier we faced similar issues when we ran graphene oxide.
Dear Roobala Chelladurai,
If the cleaning with solvents or strong mixtures of liquids such as aqua regia is not working, you can use high temperatures treatment, such as leaving the crucibles in a muffle, at temperatures above 1000ºC, during 24hs. This will oxide everything you have in the crucibles. After this treatment is finished, you can wash them with water or any other solvent.
Wish you the best of luck with this!
BTW: another option might be a solution of fluorhydric acid (HF) or potash (KOH + isopropanol), but you should be careful with these two, since they tend to attack glass, so you should use them to clean the crucibles but in a diluted solution.
Use acid bath, if it will not work then heat the crucible at high temperature
On generic methods for acid cleaning of sintered alumina (yet for tubes); cf. my post at: https://www.researchgate.net/post/How_to_wash_the_alumina_tubeWhich_chemical_is_best_for_washing_the_alumina_tube_so_that_no_cracks_form_on_surface_of_tube
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