For water treatment approach, different types of adsorbents are used. They has sufficient open hand to bind with pollutants. But, in an equilibrium study, after a certain adsorbent dose, extra doses can't remove extra quantity of effluent dye. Why?
Hi, looking to clarify what is meant by your question - is it that you keep adding higher doses of adsorbent to your solution but still can't reach 100% removal? What is the concentration of your dye? Could be that the concentration is so high/the capacity of the adsorbent to remove the dye that you never reach saturation, instead the adsorbent is always saturated first. Maybe plot out %Removal of dye vs adsorbent dose and try to get an idea of where that saturation exists? You may also wish to view the data as an isotherm to observe if you have reached adsorption capacity for the dye.
This may be because the adsorbent reaches saturation, where all available active sites are occupied, preventing further adsorption of dye molecules. Therefore, beyond this point, increasing the adsorbent dose does not result in additional removal of dye due to the limited capacity of active sites.
Check the adsorption and desorption properties of your absorbent. If the desorption capability is low that absorbent will not leave the adsorbed pollutant from its surface.