Hello,
We know that pH is a difficult parameter to control when studying the adsorption phenomenon.
I need some clarifications about control the pH of solution during adsorption if there is a method to control it.
Thank you in advance.
Hi Mohamed,
As you know pH play an important role in the adsorption process and the adsorption efficiency can be influenced by pH changes. I think controlling the pH in an adsorption process refer to measuring and recording the pH at different conditions e.g. time, temperature, dose of adsorbent and with doing so optimizing the process. in some cases you can change the pH of the solution pH (e.g. wastewater) and increase or decrease the rate of adsorption (e.g. heavy metals) into your adsorbent.
Dear Benafqir,
Generally pH of the reaction medium is monitored initially or before the adsorption process takes place. You can control it by adding acidic or basic standard solution to your desired experimental pH. You can optimize the pH by trial and error method with same physico chemical parameters (adsorbate dose, adsorbent dose, time, temperature, agitation speed) for different set of pH values.
But out of convention if you are thinking to observe the pH change during the course of adsorption process, then go for the kinetic pH study. With propagation of the adsorption time the polyelectrolytic character of the whole solution will gradually change, as a result the H+ ion concentration will also be affected, resulting the change in solution pH until the adsorption equilibrium is reached.
Dear Amin Shavandi ,
Dear Abdelkader Ouakouak ,
Dear Abhijit Pal
Thank you so much for your help.
I really appreciate that.
Best regards.
We must differentiate between controlling the pH of the solution's before adsorption or during the adsorption process. If you need to do it before the adsorption process, you can refer to the comment given by @Abdelkader Ouakouak .
If you need to control it during the adsorption process, you need to use a buffer material.
good luck
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