The aim of this work is to make a brief review of the adsorption of CO2 on modified clay minerals. Previous researchers have used different clay modifications, either by making changes in the structure by a reaction with another product or by the addition of a catalyst to improve their CO2 adsorption capacity. In order to obtain high values of CO2 uptake, some researchers have been incorporated amines-speices such as (3-aminopropyl)triethoxysilane (APTES), tetraethylenepentamine (TEPA) and a branched polyethylenimine (PEI) by grafting or impregnation. The synthesis of an adsorbent from mineral clays can generate an increase in its porosity and in its textural properties. These investigations differ in a number of factors such as the kind of clay, the operating conditions, y and the nature of the impregnated compound. The role of these factors in the CO2 adsorption capacity will be considered in detail in this review.

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In this work, the adsorption of toluene onto acid-activated bentonite in a fixed bed using an inverse gas chromatography was investigated. Adsorbent was prepared according to an optimized activation process. Experimental and theoretical studies were established to evaluate the removal efficiency of toluene by adsorption on acid-activated bentonite and to predict kinetics parameters. A suitable adsorption model has been developed to simulate the measured data based on linear driving force approximation. The fourth-order Runge-Kutta method was used to integrate the partial differential equations, and the resulting functions were simultaneously solved to obtain the breakthrough profiles. Theoretical predictions from the model were compared with column adsorption data to ensure the validity of the model. Adequate agreement between simulations and experimental data was reached.

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Adsorption of toluene onto acid activated clay was carried out. Modified clay was prepared by acid attack (H 2 SO 4 ) on raw material. Response surface methodology based on a 2-level, 4-variables central composite orthogonal design was used to evaluate the effects of important parameters on the adsorption of toluene on to activated clay. .2 • C), contact time (0.57-6.93 h), mass ratio of liquid/solid (3.38-7.62) and strength of acid (7.75-57.24%) were chosen as process variables for the optimization. Of these parameters, temperature reaction and time had greater impact on toluene adsorption than did the other parameters. Analysis of variance (ANOVA) shows a good agreement between theoretical analysis and experimental data. The validity of model is verified by an experiment at the optimum conditions. The optimum conditions for the maximum adsorption of toluene onto activated clay are: temperature of 96.2 • C, a contact time of 6.93 h, a liquid/solid ratio of 5.98 and strength of acid of 32.94%. Since the predicted values and the actual experimental value obtained for the maximum adsorption of toluene are within 95% confidence intervals, the final model is considered valid and has satisfactory predictive ability.L'adsorption du toluène sur l'argile activée par l'acide est réalisée. L'argile modifiée aété préparée par attaque acide (H 2 SO 4 ) de la matière première. On a eu recoursà la méthodologie de surface de réponse basée sur un plan d'expériences orthogonal composite centréà 2 niveaux et 4 variables afin d'évaluer les effets des paramètres importants pour l'adsorption du toluène sur l'argile activée. La température (53,8 • C-96,2 • C), le temps de contact (0,57-6,93 h), le rapport massique liquide/solide (3,38-7,62) et la force de l'acide (7,75-57,24%) ontété choisis comme variables de procédé pour l'optimisation. Parmi ces paramètres, le temps de contact et la température ont le plus grand impact sur l'adsorption du toluène. L'analyse de la variance (ANOVA) montre un bon accord avec l'analyse théorique et les données expérimentales. La validité du modèle est vérifiée par une expérience dans les conditions optimales. Les conditions optimales pour l'adsorption du toluène sur l'argile activée sont: la température de 96,2 • C, le temps de contact de 6,93 h, le rapport liquide/solide de 5,98 et la force de l'acide de 32,94%.Étant donné que la valeur prédictée et la valeur expérimentale réelle obtenue par l'adsorption maximale du toluène se trouvent dans un intervalle de confiance de 95%, le modèle final est considéré comme valide et possède une capacité de prédiction satisfaisante.