Dear all,
I'm working on (photo)catalytic degradation of organic contaminants. Recently, I noticed that the degradation efficiency was higher at relatively higher initial contaminant concentration (Co = 30 ppm) than at lower concentration (Co = 10 ppm). This was weird as I was expecting higher degradation efficiency at lower Co (keeping the catalyst loading constant). At low Co, the catalyst surface has ample of active sites, and hence should result in higher degradation efficiency. However, I got lower degradation efficiency, and I couldn't explain it why.
I would appreciate it a lot if any one has the explanation for this or could suggest me any literature. I tried to review many articles, but it comes out zilch.
Thank you in advance ^^
There is most probably another aspect to your problem.
The probability of the active sites on the catalyst, meeting a molecule of the pollutant, is likely to be less in case of a dilute solution, in comparison to that in case of a concentrated solution.
This might be the reason.
With best wishes,
Article Photocatalytic degradation of metoprolol by TiO2 nanotube ar...
i'm not sure but it can be related to your reaction kinetic, and parameters.
the chance that your contaminents meet the active sites of catalyst (efficient collision) decreases with concentration, and if you have a solid catalyst you can try to investigate this effect by making a contineous flow system for your reaction with recycling
if you get better degradation in this case (after each recycling cycle) the theory of (collision ) can be a good start
and it's well known that in diluted solution (especially liquids) the reaction depends on diffusion instead of direct collisions $
good luck
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