In my recent adsorption experiments with dyes using a fixed-bed column, i have observed that the system dos not reach exhaustion, i.e., complete saturation of the adsorbent bed is not achieved. Consequently, the effluent-to-influent concentration ratio (Cf/Co) remains considerably lower than the values typically reported in the literature (>= 0.9). In my case, the maximum Cf/Co obtained is approximately 0.6.
What potencial factors could be preventing the column from reaching exhaustion, and what strategies could be implemented to overcome this limitation?
There could be many contributing factors. I'll list some, though I may miss a few possible causes:
Recommendation: Start by checking points 1, 2, and 6, as they are the easiest to verify.
Thank you for the information, Dr. Yamid Gomez Rueda. I repeated the experiments by increasing the initial dye concentration (it was first 10 mg/L, and I repeated it with 300 mg/L). The result was the same; however, the equilibrium behavior at this new concentration occurred at a lower fraction, that is, it reached equilibrium at a Cf/Co value well below 0.6. Could the particle size of the material be causing this issue?
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