Is it possible that adsorption capacity (qe) decreases with increase in adsorbent dosage at fixed adsorbate conc, while the removal efficiency increases?
Hello. Yes it is normal. Because when calculating the qe the absorbent dose value in the denominator of the équation used. So when the mass increasis it decrease the qe value. On the other hand the removal efficiency dos not used the mass in it équation. It use Just the concentration both initial and at equilibrium. With addition of the mass the Ce decreases White the Co star constant. That's why we observed the increase of % with increase of mass
Hello. Yes it is normal. Because when calculating the qe the absorbent dose value in the denominator of the équation used. So when the mass increasis it decrease the qe value. On the other hand the removal efficiency dos not used the mass in it équation. It use Just the concentration both initial and at equilibrium. With addition of the mass the Ce decreases White the Co star constant. That's why we observed the increase of % with increase of mass
Hello, As mentioned by Mouhamadou Sali this is a normal observation. Qe is the quantity adsorbed per unit mass of adsorbent therefore increasing the adsorbent dosage at fixed adsorbate concentration will obviously lead to a decrease in Qe when the mass adsorbed becomes constant. However, it is possible to observe an increase in Qe until the optimal amount of Qe is reached. From this moment, any additional mass of adsorbent will not contribute to elimination and therefore the adsorbed quantity per unit of mass will start to decrease. If you want to observe the zone of increase in Qe, I suggest you perform the adsorption test with lower masses.
As reported by Chimi Geordamie it is best advised you do your sorption with lower masses. Secondly, if you're varying dosage amounts, I mean you should expect some decrement in capacity so as to reach equilibrium... you are not wrong anyway. Just look for where you are reaching equilibrium irrespective of the dosage masses you are using. Thanks.
Thank you all.. i varied the adsorbent dosage amount from 5 mg to 20 mg in steps of 5..
You can try in the region below 5 mg or You can also increase the concentration of adsorbate.
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