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Topic: Zinc oxide and Phosphate  (Read 3915 times)

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Offline Og

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Zinc oxide and Phosphate
« on: July 08, 2010, 09:44:06 AM »
Hi ,
I have quite a basic question .
When I'm exposing let say inorganic phosphate in the form of H2PO4 or
HPO4(-2), to a nanopowder of zinc oxide, Can I expect the phosphate to replace the oxygen ?
Or in the form of simple question , will ZnO nanoparticle can remove inorganic phosphate from a solution , and if so what are the condition (pH, etc. )
Thank you
Ohad

Offline BluRay

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Re: Zinc oxide and Phosphate
« Reply #1 on: July 14, 2010, 02:49:58 PM »
In water solution, if the phosphate concentration is high, I think it's possible, with time, because ZnO is not completely insoluble:

ZnO + H2O  ::equil::  Zn(OH)2

Zn(OH)2   ::equil::  Zn2+ + 2OH-

As you see, a low pH favours this process.

So Zn2+ can slowly react with phoshate, giving zinc phosphate and which ones depends on pH: an high pH favours the precipitation of more insoluble phosphates so an high pH favours this process.

In conclusion the pH is critical. A meaningful calculus should consider kinetics too so the answer is not very easy. I can only say that what you think it's possible.

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