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Topic: why does tio2 change to yellow?  (Read 1641 times)

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Offline karo18

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why does tio2 change to yellow?
« on: June 12, 2018, 09:11:00 AM »
Hi
I synthesized tio2 by sol-gel method and got white tio2.
And I stored it in oven that maintains about 100 degrees celcius temperature.
After two weeks, I taked out tio2 and two samples turned week yellow.
At first, I did not think it was big trouble, so I conducted the dye decomposition experiment with it.
But the yellow tio2 did not show any activity.
The dye was not decomposed.
I used urea, NH4Cl to make tio2 that turned yellow, and just titanium isopropoxide for tio2 that did not turn yellow.
I don’t konw why I have this result.
If you know the cause of it, plz tell me.

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