paramètres influençant l'adsorption


  • II .5.Les Modèles d’adsorption

    Depuis de nombreuses années, plusieurs équipes ont souvent souhaité modéliser l’adsorption. Les isothermes d’adsorption sont souvent utilisées pour décrir ce phénoméne. Une telle isotherme est une courbe qui représente la relation entre la quantité de soluté adsorbé par unité de masse d’adsorbant Qe et la concentration de soluté en solution Ce. On ...

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    C0: Concentration initiale (mg/l) à t=0. V : Volume de la solution (litre). m : Masse adsorbant du support (g).

What are the fundamentals of adsorption?

The first article (1)of this two-part series presented the fundamentals of adsorption, including equilibrium and mass- transfer considerations, the mass-transfer zone concept, breakthrough, regeneration, and column sizing.

What causes adsorption?

The attraction is caused by van der Waals forces and hydrophobic interactions (not covalent bonding). Bonding energies in adsorption range from about 10 to 70 kJ/mol, much lower than typical covalent bond energies of 200 to 500 kJ/mol.

What is the preferred particle size for gas adsorption?

The preferred particle size is the smallest one that still has a tolerable pressure drop. In general, gas adsorption employs larger particles than liquid adsorption, because gas diffusion rates are higher.

What is gas phase adsorption?

Gas phase adsorption is a condensation process where the adsorption forces condense the molecules from the bulk phase within the pores of the adsorbent.

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