Experimental Determination of the CH4 and CO2 Pure Gas Adsorption Isotherms on Different Activated Carbons

2018 ◽  
Vol 63 (8) ◽  
pp. 3027-3034 ◽  
Author(s):  
Deneb Peredo-Mancilla ◽  
Cecile Hort ◽  
Mejdi Jeguirim ◽  
Camelia Matei Ghimbeu ◽  
Lionel Limousy ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Activated Carbons

scholarly journals Ni(II) and Cd(II) Simple and Competitive Adsorption on Activated Carbon Oxidized. Influence of the Oxidant Agents HO and NaClO

2015 ◽  
Vol 9 (1) ◽  
pp. 20-27
Author(s):  
Miguel A. Sánchez ◽  
Paola Rodríguez-Estupiñan ◽  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Adsorption Isotherms ◽  
Competitive Adsorption ◽  
Gas Adsorption ◽  
Activated Carbons ◽  
Bet Surface Area ◽  
Textural Parameters ◽  
Chemical Groups ◽  
Langmuir And Freundlich Models

In this study, granular activated carbon, GAC, was modified by oxidation with HO and NaClO aqueous solutions and heat treatment at 900°C. The N adsorption isotherms at − 196°C and SEM and FTIR results were used to characterize the properties of the prepared ACs. Textural parameters such as BET surface area and pore volumes were assessed by gas adsorption. The BET surface area values of solids were between 687 and 876 m2g-1. Additionally, immersion enthalpies of activated carbons in benzene, water, hydrochloric acid and sodium hydroxide solutions and Ni(II) and Cd(II) solutions of 500 mgL were determined, with values between 32 and 145 Jg-1. Ni(II) and Cd(II) adsorption isotherms were determined at pH 6 on activated carbons and competitive adsorption tests were realized between the two ions. The results show that in the tests carried out, the adsorption capacity decreased when the content of chemical groups on the surface also decreased. Finally, the experimental results of adsorption from the solution were adjusted to the Langmuir and Freundlich models and the first model was found to be better. With maximum adsorption capacities, the values for Ni(II) were between 3.99 and 64.9 mgg-1 and for Cd(II) were between 2.61 and 55.2 mgg-1. The values of the competitive adsorption ions present in the solution, Ni(II) and Cd(II), in the activated carbons, decreased compared to those obtained in the simple adsorption, indicating the effect of the an ion competitive presence in adsorption another.

USE OF INTERPOLATION THEORY IN THE ANALYSIS OF GAS ADSORPTION ISOTHERMS: I. THEORY

1955 ◽  
Vol 33 (2) ◽  
pp. 193-202 ◽  
Author(s):  
J. M. Honig ◽  
P. C. Rosenbloom
Keyword(s):  
Adsorption Isotherms ◽  
Adsorption Process ◽  
Gas Adsorption ◽  
Upper Bounds ◽  
Interpolation Theory ◽  
Lower And Upper Bounds ◽  
Physical Quantities ◽  
Adsorbent System ◽  
Quantities Of Interest

The theory presented in this paper permits the determination of extremal bounds for a given adsorbate–adsorbent system within which the adsorption isotherms must fall if certain assumptions pertaining to the nature of the adsorption process are applicable. The use of interpolation theory in estimating lower and upper bounds on physical quantities of interest in adsorption theory is also discussed.

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