I have a fixed-bed column with a known amount of algae to adsorb heavy metal with known initial concentration.
I think in continuous systems the unit of q is mg/g/L is that right?
what shall I do to have a plot (q vs time)
Dear Jabir,
If you talking about adsorption capacity of your adsorbent, unit of the qe is mg.g-1 I think. For example I can recommend you to use"Thomas model". It is very useful to exihibit the adsorption process in adsorption columns.
The Thomas model is one of the most general and widely used theoretical methods to describe column performance. This model can be described by the following expression:
Ct/C0= 1/1+exp((Kth/F)(q.X-C0.Vef))
where, C0 and Ct are respectively the influent and effluent concentrations (mg L-1), Kth is the Thomas rate constant (mL/mg/min), q is maximum capacity of adsorption (mg g-1), X quantity of adsorbent in the column (g), Vef is volume of solution (mL) and F is the feed flow (mL.mn-1).
Good luck.
Dear Jabir,
q has a unit of (mg/g). The Thomas kinetic model is widely used to analyze packed bed adsorption performance. The linearized form of the Thomas model is given as Ln (Co/Ce−1)=(KthqoM/Q) −(kthCot)
where Ce, Co are the effluent and influent solute concentrations (mg/l) at any time (t), qo = the maximum adsorption capacity of the bed (mg/g), M = the total mass of the adsorbent (g), Q = volumetric flow rate (mL/h) and Kth = the Thomas rate constant (mL/mg h).
The kinetic coefficient, Kth and the adsorption capacity of the bed, qo can be determined from the plot of Ln [(Co/Ce)-1] against t.
Dear Jabir,
Break througt point is determined using concentration, this can explain why in bed adsorption it is not possible to see Qt versus tome.
but how to draw Ln [(Co/Ce)-1] against t , please explain as i am facing this issue for the last 6 months
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