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Chemgineer
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[*] posted on 17-12-2023 at 15:46
Titanium dioxide


I bought 2kg of titanium dioxide from ebay a while back and I am thinking it is the most useless reactant I have purchased so far!

Is there anything interesting to use it for? I know there is a thermite reaction but i've not had any luck with that.
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Admagistr
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[*] posted on 17-12-2023 at 20:41


Quote: Originally posted by Chemgineer  
I bought 2kg of titanium dioxide from ebay a while back and I am thinking it is the most useless reactant I have purchased so far!

Is there anything interesting to use it for? I know there is a thermite reaction but i've not had any luck with that.


TiO2 is remarkably inert,you have to convert it to some soluble titanium compound.Titanium has a very interesting chemistry,especially in the Ti3+ oxidation state,it is colourful and interesting. You can use TiO2 alone to synthesize a beautiful blue sapphire in combination with FeO,it's not easy,but I know one person on this Forum who has done it and had success with it!Otherwise buying chemicals on Ebay is a risk,a friend bought MoO3 there a while ago,which turned out to be actually limestone!
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Maurice VD 37
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[*] posted on 18-12-2023 at 01:17


Why did you buy a product that was known to be nearly useless ? What for ?
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[*] posted on 18-12-2023 at 01:57


Not useless. TiO2 has an abundance of uses, mostly as a pigment. But it is inert.

I bought some for thermites a while back. Not terribly successful, but I think I was trying too small a scale.

Ti does have interesting chemistry. The complex with H2O2 is very interesting, and a good indicator of the presence of Ti ions. TiCl3 is a lovely purple. However, unstable. It quickly hydrolyses in solution to TiO2. Pretty much all roads end in TiO2, which means the oxide is not a great starting point.

I am going to throw out some wild guesses without reading or references. My guess is that the best way forward would involve fusing it with another salt (NaOH? KNO3??)at high temp and see if you can convert it to something soluble. You could compare with methods for processing CeO2 which has a similar 3+/4+ chemistry.

As with anything, the fact that it is unknown territory means there are opportunities for genuine experimentation.
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[*] posted on 18-12-2023 at 02:45


It has some catalytic properties:
https://www.sciencedirect.com/science/article/abs/pii/B97801...




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Chemgineer
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[*] posted on 5-1-2024 at 13:16


I managed to get some thermite to work with the help of some potassium nitrate and sulphur to sensitize it.

10g aluminium powder
32g titanium dioxide
4g potassium nitrate
2g sulphur

Placed it in a heap and lit it with a sparkler wrapped with magnesium ribbon (although it ignited before the magnesium so that isn't needed).

Quite a slow burn but and intense white light, unfortunately the titanium didn't pool into one piece.

[Edited on 5-1-2024 by Chemgineer]
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[*] posted on 6-1-2024 at 10:59


TiO2 should dissolve in molten NaHSO4. At least according to literature.
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[*] posted on 6-1-2024 at 12:44


How about making a Ti4O7 electrode by partial reduction using C, H2 or Ti powder?
Its a bit of a technical challenge, needing temps of ~1000C, but the resulting electrode is reportedly quite robust chemically.




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