I am trying to exfoliate Ti3AlC2 with the method of Li/HCl. Ti3AlC2 (>=98%) was purchased, and has been characterized by XRD. Since the HCl itself is not enough to exfoliate Ti3AlC2, i added 12M HCl to Ti3AlC2 directly, and stirred for several hours. For a couple of hours, even half of the day, nothing happend, Ti3AlC2 in the solution just sank, and the supernatant was clear. However, after maybe 2 days(start from the moment i mixed them), i caught sight of the solution, it has turned to pink(i am not sure about the exactly color, a little bit purple or red ?), and the supernatant was still clear. Next, i collected some to do UV-Vis, results hasn't come out yet. Is there anyone know what such solution is? Ti2CTx (T=OH, F, O) ? If so, can i make a conclusion that i can wash the Ti3AlC2(remove the impurities) in this way?
(Not my expertise, so wait for others...)
BUT - a simple wiki look shows that titanium ions (Titanium3+) are violet? this would give you a pinky-purple shade if you've got Ti3+ in solution?
https://en.wikipedia.org/wiki/Color_of_chemicals
...and it looks like TiCl3 is purple according to this site...
http://www.wikiwand.com/en/Titanium(III)_chloride
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