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| Adsorption from Solutions |
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| Adsorption of solutes from solutions also takes place on solids. Process of adsorption is used to reduce colors from solution. For e.g., raw sugar solution is decolorised by charcoal. Chromatographic separation of a mixture of compounds in solution happens due to the different adsorption tendencies of the compounds on to the solid phase. Chromatographic methods are used in the analysis of environmental pollutants as well as in the pharmaceutical industry. As mentioned earlier, activated carbon is used extensively in water and waste-water treatment. |
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| Freundlich and Langumir adsorption isotherms are also applicable to adsorption processes in solutions. In place of equilibrium pressures, equilibrium concentrations of the adsorbates are used and the isotherms are expressed in the forms, |
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| where 'c' is the concentration of the solute in solution. |
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