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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The point of zero charge pH PZC of sawdust. By transposition to the liquid phase, we have calculated the concentration distribution in the bed eq. Aftif study in a solid system: Basic red dye, sawdust, adsorption, kinetics, mechanisms. From the difference in the area of the two curves, it is possible to calculate the supplementary biological degradation.
These methods have given information about the nature of the functional groups which are on the surface of the activated carbon. Molecules are adsorbed and immobilized onto sites of different energies They do, however, have some interactions with other adsorbed molecules. Revue des sciences de l’eau24 2— 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.
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Values of the kinetic constants for the adsorption of the basic red dye on sawdust. Application of the intra-particle diffusion model to the adsorption of the basic red dye on sawdust.
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 ; parameters which can be adsortpion by the different equations will also be compared.
Low concentrations of organic contaminants are not easily removed by conventional treatment methods, but activated carbon bas a good affinity for various organics and is adsorptiob in batch or column reactors.
The A parameter is related to the depth Z of the adsorbant: The No value is similar to those obtained from the other equations. Mohamed Zarrouki 1, 2 Details. The linear flow rates were 3. The thermodynamic study has shown that the data tiken from adsorption of the dicyanoaurate ions onto the carbon can be fitted by LANGMUIR’s isotherm, which has been generalized for several types of sites. Wednesday, April 5, – The agreement is only for the low values of C in the break-through curves.
Their is good agreement.
Étude cinétique et thermodynamique de l’adsorptio… – Revue des sciences de l’eau – Érudit
Solution d’ion dicyanoaurate-charbon actif. The limiting step is the diffusion through a film at the start of the reaction, which is followed by the diffusion-adsorption into the porous structure in a region close to equilibrium. Kinetic modeling of the adsorption of basic dyes by kudzu. Thexes chemical surface reaction was fitted to a pseudo-second order equation, with very high regression coefficients.
Mode, dynamic adsorption, activated carton, kinetic parameters, anionic surfactant, humic acids. 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. In conclusion, nome of the tested models lead to different parameters by using low break-through curve concentrations or others with the whole range of experimental chqrbon, but only one CLARK gives a good description of the break-through curves in our actual knowledge.
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.
Adsorption isotherm of the basic red dye on sawdust. Effect of pH on the adsorption of the basic red dye on sawdust. Revue des sciences de l’eau6 163— Activated carbon is used as the adsorbent. Tuesday, Acsorption 16, – 2: The activated carbon efficiency No can be estimated and the adsorption rate constant calculated from the slope and the y-intercept. The percentage is constant alter 35 cm depth of the activated carton in agreement with the electon microscopy study that showed that the flora was only present in the 10 first centimeters.
The linearized Clark equation 16 gives a good representation of experimental results fig. The general equation is equation The kinetics, thermodynamics and isotherms of the adsorption were used to identify the retention mechanisms.
The coefficients A and B table 1 are determined from the straight lines obtained with the low break-curve concentrations fig. Revue des sciences de l’eau 24, n o 2 The aim of this work is to study the recovery of precious metals by complexing them with a suitable reagent. Langmuir and Freundlich parameters for the adsorption of the basicred dye on sawdust.
As early as BOHART and ADAMS presented differential equations which catif 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.
The interactions between this solution and the solid were characterized by several methods: B value can be determined with the different columns fig. The kinetic coefficient Sa, and the maximum capacity adsorption No are shown in table 1. Experimental results were modelled according to kinetic equations representing pseudo-first order, pseudo-second order reactions, as well cahrbon equations for external and intra-particle diffusion. Application of the pseudo-second order model to the adsorption of the basic red dye on sawdust.
Application of the Langmuir model to the adsorption of the basic red dye on sawdust. Effect of temperature on the adsorption of the basic red dye on sawdust.
Revue des sciences de acyif 6, n o 1 Mohamed Zarrouki 1, 2 AuthorId: Tuesday, October 23, – 2: Effect of contact time on the adsorption of the basic red dye on sawdust.