I studied the effect of temperature on adsorption of methyl orange by carbon and noticed an increase in adsorption capacity with increasing temperature. What may be the reason for this? The carbon used was surface modified with potassium hydroxide.
Hi
the short answer is Yes, by increasing the temperature the rate of chemical reaction increases, so if the soprtion process is chemisorption then you would see a higher sorption at the higher temperature ( it would reach an equilibrium eventually). but if the process is a physical adsorption then the higher temperature would have the negative result of adsorption. also, consider that temperature can chemically change the adsorbent and its adsorption sites and activity. the better adsorption at higher temperature might also indicate the endothermic nature of this process.
I hope it will help,
Amin
Hi
the short answer is Yes, by increasing the temperature the rate of chemical reaction increases, so if the soprtion process is chemisorption then you would see a higher sorption at the higher temperature ( it would reach an equilibrium eventually). but if the process is a physical adsorption then the higher temperature would have the negative result of adsorption. also, consider that temperature can chemically change the adsorbent and its adsorption sites and activity. the better adsorption at higher temperature might also indicate the endothermic nature of this process.
I hope it will help,
Amin
Hi Abinaya
Addition to what has been mentioned by Dr Amin, the diffusion of the methyl orange particle is affected by the temperature which leads to higher mass transfer rate from bulk to the boundary layer around the surface of the carbon particle.
Yes, As the temperature is increased the adsorption capacity increases. It is just like as the temperature increases the rate of the reaction also increases.The surface becomes activated.& adsorption capasity increases.
If adsorption process showing increasing of adsorption capacity as temperature increases, this means it is endothermic which enhanced at high temperatures. In this case, as the temperature increases, the favorable intermolecular forces between adsorbate and adsorbent are much stronger than those between adsorbate and solvent. As a result, the temperature increasing causes adsorbate to be more easy to adsorb.
Dear Abinaya Arunachalam
Refer to the following link for more information and graphical representation. Good luck
https://goo.gl/images/t1hUSs
Best regards.
The adsorption capacity increased with increase in temperature because the mobility of the dye molecule increased with increase in their kinetic
Yes, the adsorption capacity increased with increase in temperature.
You may refer to the following article:
http://www.sciencedirect.com/science/article/pii/S0167732217301514#f0015
Adsorption capacity of an adsorbent increases with temperature because with increase in temperature the dye uptake increases as dye molecules may acquire sufficient energy to undergo an interaction with active site at the surface . The increase in adsorption capacities of adsorbents with increase in temperature may also be attributed to the pore size enlargement.
Kindly refer the papers
An increase of adsorption capacity as temperature increases means that the reaction is endothermic which is enhanced at high temperatures. In this case, as the temperature increases, the favorable intermolecular forces between adsorbate and adsorbent are much stronger than those between adsorbate and solvent. As a result, the temperature increasing causes adsorbate to be easier to adsorb.
dear sir
temperature has negative or positive effect on adsorption process so if you want to study the nature of effect you must re-evaluation of equilibrium isotherm to get primary behavior of by fitting with equilibrium isotherm models ( Langmuir and Frendlich) after that using obtained constant of Langmuir models K for plotting ln Kl vs 1/T heat of adsorption delta H (20-40) kj/mol physical ( more than 40 ) chemical adsorption
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