I came across paper which indicate higher equilibrium adsorption capacity of activated carbon with higher inlet vapour phase Hg0 concentration. I am curious to know why does the equilibrium adsorption capacity change with higher concentration. I expect only the breakthrough time to decrease at higher concentration. Is it not that the equilibrium adsorption capacity a function of available adsorption sites, which is limited.
Because the rate of desorption increase them must be a higher pressure to equalize the adsorption and desorption rartes
Pushpa Madam,
Is it not necessary that equilibrium will be achieved only when all the sites are occupied. Further,the active sites are fixed unless the adsorbent is modified. So please explain how the active sites are a function of inlet concentration.
Dear all,
I think that actually the adsorption process is an equilibrium process. We can show the general equation as follow: A + () (A)
here, A: adsorbed substance, (): active site of adsorbent substance. Due to Le Chatelier's principle, we can see clearly that the adsorption capacity increase with higher concentration (higher active sites)
Regards,
Dang
Activated carbon (adsorbent) dose/concentration is the same whereas the adsorbate concentration is increasing. This means that you are increasing the adsorbate molecules. In this situation, some more vacant sites on the carbon will be occupied by the adsorbate molecules due to higher concentration.
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