Adsorption of acetic acid on charcoal and the isotherm

Adsorption of acetic acid on charcoal and the isotherm

Adsorption of acetic acid on charcoal and validity of Freundlich’s adsorption isotherm and Langmuir’s adsorption isotherm

Adsorption of acetic acid on charcoal is the topic of discus for today. Adhesion to a surface is called adsorption of atoms, ions, biomolecules or gas, liquid or dissolved solids molecules. The activated charcoal adsorbs acetic acid. The activated charcoal adsorbs the acids in their porous in the meanwhile this process follows the adsorption isotherm of Freundlich as well as isotherm of Langmuir. Adsorption of acetic acid on activated charcoal is a very important topic to understand the validity of Freundlich’s adsorption isotherm as well as Langmuir’s adsorption isotherm.

The amount adsorbed by an adsorbent is dependent on pressure and temperature. Thus the amount (X) adsorbed is a function of pressure (P) and temperature (T), i.e.

X= f(P,T)

A plot of P vs X, keeping temperature constant is known as adsorption isotherm.

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Download PDF of Adsorption of acetic acid on charcoal and validity of Freundlich’s adsorption isotherm and Langmuir’s adsorption isotherm

Freundlich’s adsorption isotherm:

Freundlich’s adsorption isotherm; represented by –

X/m = kc1/n

where m= the amount of adsorbing material C is the equilibrium constant of adsorbate in the solution k is the constant depending on the nature of both adsorbate and adsorbant n is another constant depending on the nature of both adsorbates.

The value of 1/n is less than unity. On taking the logarithm of the equation,

log (x/m)= 1/n log c + log k         —————————— (2)

If a plot of log (x/m) vs log c gives a straight line with a slope of 1/n and intercept of log k, Freundlich’s adsorption isotherm is valid

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Langmuir’s adsorption isotherm:

According to Langmuir for a uni-molecular layer, the following relation holds for adsorption,

x/m = k1k2c/(1+k1c)

where k1 and k2 are the constant.

The above equation can be written as-

c/(x/m) = 1/ k1k2 + c/k2

Thus a plot of c/(x/m) vs c gives a straight line with a slope of 1/k2 and an intercept of 1/ k1k2 and shows the validity of Langmuir adsorption isotherm

Apparatus and chemicals:

Burette, pipette, Activated charcoal, 0.5N acetic acid, 0.1N NaOH, Stopped bottles, Shaking machine, etc.

Procedure:

  • Prepare 0.5N acetic acid as well as 0.1N NaOH solution.
  • Take 6 clean and dry stopped bottle and prepare the following solutions in the table-
Bottle No 0.5N Acetic acid(mL) Distilled water (mL) Amount of charcoal (g)
01. 50 0 1
02. 40 10 1
03. 30 20 1
04. 25 25 1
05. 20 30 1
06. 10 40 1
  • Spotted each bottle after that shake for at least 1 hour.
  • Filter the solution through a filter paper as well as collect the filtrate in the numbered bottle. reject the first 5 mL of each filtrate.
  • Pipette out 10 mL of each filtrate and titrate with 0.1N NaOH solution.
  • Note Down the temperature of the solution.

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Data :

Download PDF of Adsorption of acetic acid on charcoal as well as the validity of Freundlich’s adsorption isotherm and Langmuir’s adsorption isotherm

Download PDF of Adsorption of acetic acid on charcoal as well as the validity of Freundlich’s adsorption isotherm as well as Langmuir’s adsorption isotherm

Adsorption of acetic acid on charcoal

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Adsorption of acetic acid on charcoal

Calculation:

Download PDF file of the Calculation of Adsorption of acetic acid on charcoal

Adsorption of acetic acid on charcoalAdsorption of acetic acid on charcoal

Graph:

Adsorption of acetic acid on charcoalAdsorption of acetic acid on charcoalAdsorption of acetic acid on activated charcoalAdsorption of acetic acid on activated charcoal

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PDF of Adsorption of acetic acid on activated charcoal

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