![]() ![]() ![]() Langmuir and Freundlich adsorption isotherm which fails to explain other isotherms except type I is well explained by the BET equation BET Equation BET theory also considers that adsorption sites on the solid surface are homogenous and that adsorption at one site has no effect on adsorption at nearby sites. after the monolayer has formed, the adsorption process proceeds to the formation of the multilayer forming second, third, and so forth layers. According to the theory, adsorption takes place only on specific areas of the sample surface (one per molecule), and doesn’t stop at monolayer formation but first adsorbed gas molecules provide an adsorption site for subsequent gas molecules leading to the multilayer adsorption. BET adsorption isotherm proposed by Brunauer, Emmett, and Teller accounts for multilayer adsorption.
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