Cinetique de l’adsorption du phenol en couche fluidisee de charbon actif R. Ganho. Thèse Docteur-Ingénieur, Université Paul-Sabatier, Toulouse ().  . Etude de l’adsorption de complexes cyanures sur charbon actif .. They demonstrated that the removal of these metal ions followed the descending order : Cu\. Request PDF on ResearchGate | Modélisations des isothermes d’adsorption sur charbon actif de composés aromatiques en solution aqueuse | Models have.
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Effect of temperature on the adsorption of the basic red dye on sawdust.
Adsorption study in a solid system: From the difference in the area of the two curves, it is adsorprion to calculate the supplementary biological degradation. This has allowed us to understand the fundamental mechanism of adsorption in a model system which consists of a solution of dicyanoaurate ions and activated carbon. As early as BOHART and ADAMS presented differential equations which govern the dynamics of the adsorption of vapours and gases on fixed beds and the final result, applied to the liquid-solid phase, yields the kinetic adsorption rate k and the maximum adsorption capacity No eq.
These methods have given information about the nature of the functional groups which are adsorphion the surface of the charbin carbon. Two parameters A and r are determined by regression equations ; we proposed a simple method to calculate A and r by a linearization of the preceding equation eq. Revue des sciences de l’eau 24, n o 2 By transposition to the liquid phase, we have calculated the concentration distribution in the bed eq.
The use of this model is facilitated by our linearization and the case of particular phenomena: The interactions between this solution and the solid were characterized by several methods: Tuesday, October 23, – 2: The limiting step is the diffusion through a tyeses at the start of the reaction, which is followed by the diffusion-adsorption into the porous structure in a region close theees equilibrium.
The linearized Clark equation 16 gives a good representation of experimental results fig. Basic red dye, sawdust, adsorption, kinetics, mechanisms.
Thermodynamic parameters for the adsorption of the basic adsorpption dye on sawdust. The coefficients A and B table 1 are determined from the straight lines obtained with the low break-curve concentrations fig. Low concentrations of organic contaminants are not easily removed by conventional treatment methods, but activated charboon bas a good affinity for various organics and is used in batch or column reactors.
Effect of the sawdust dosage on the adsorption of the basic red dye in aqueous solution. The adsorption thermodynamics and isotherms are consistent with a spontaneous exothermic chemisorption reaction, leading to an organized monolayer of the dye molecules on the sorbent surface.
Application of the intra-particle diffusion model to the adsorption of the basic red dye on sawdust.
Adsorption dynamique en phase liquide sur charbon… – Revue des sciences de l’eau – Érudit
Acfif modification depends on the nature and pressure of the gas used. Some investigators have attempted to simulate column performance with mathematical models and the aim of this work is to present the principal models and verify how the different models are applied to break-through curves chabon parameters which can be evaluated by the different equations will also be compared.
The percentage is constant alter 35 cm depth of the activated carton in agreement with the electon microscopy study that showed that the chharbon was only present in the 10 first centimeters. Have you forgotten your login? B value can be determined with the different columns fig.
The point of zero charge pH PZC of sawdust. The kinetic coefficient Sa, and the maximum capacity adsorption No are shown in table 1. The A parameter is related to the depth Z of the adsorbant: Effect of contact time on the adsorption of the basic red dye on sawdust.
Application of the external diffusion model to the adsorption of the basic red dye on sawdust. The aim of this work is to study the recovery of precious metals by complexing them with a suitable reagent. The thermodynamic study has shown that the data adsortpion from adsorption of the dicyanoaurate ions onto the carbon can be fitted by LANGMUIR’s isotherm, which adsortion been generalized for several types of sites.
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The general equation is equation Activated carbon-dicyanoaurate ion solution. For the kinetics study, perfectly stirred batch experiments were carried out after adjustment of the parameters influencing the system, such as the pH, adsorbent dosage and initial dye concentration.
The Freundlich isotherm equation fig.
The chemical surface reaction was fitted to a pseudo-second order equation, with very high adsogption coefficients. La sciure de bois contient des groupements polaires tels que les hydroxyles et les carboxyles. Revue des sciences de l’eau6 163— Experimental results were modelled according to kinetic equations representing pseudo-first order, pseudo-second order reactions, as well as equations for external and intra-particle diffusion.
With the use of the two parameters, the break-through curves have been recalculated fig. The model developed by CLARK is based on the use of e mass-transfer concept in combination with the Freundlich isotherm fig. Adsorption isotherm of the basic red dye on sawdust.