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The Freundlich equation or Freundlich adsorption isotherm, an adsorption isotherm, is an empirical relation between the concentration of a solute on the surface of an adsorbent to the concentration of the solute in the liquid with which it is in contact. In 1909, Herbert Freundlich gave an expression representing the isothermal variation of adsorption of a quantity of gas adsorbed by unit mass of solid adsorbent with pressure. This equation is known as Freundlich Adsorption Isotherm or Freundlich Adsorption equation. As this relationship is entirely empirical, in the case where adsorption behavior can be properly fit by isotherms with a theoretical basis, it is usually appropriate to use such isotherms instead (see for example the Langmuir and BET adsorption theories). ==Freundlich adsorption isotherm== The Freundlich Adsorption Isotherm is mathematically expressed as : It is also written as : or : It is also written as : where :''x'' = mass of adsorbate :''m'' = mass of adsorbent :''p'' = Equilibrium pressure of adsorbate :''c'' = Equilibrium concentration of adsorbate in solution. ''K'' and ''n'' are constants for a given adsorbate and adsorbent at a particular temperature. At high pressure 1/n = 0, hence extent of adsorption becomes independent of pressure. It is used in cases where the actual identity of the solute is not known, such as adsorption of colored material from sugar, vegetable oil etc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Freundlich equation」の詳細全文を読む スポンサード リンク
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