CO2N2 and CO2CH4 binary adsorption isotherms with H-ZSM5: The importance of experimental data regression with the concentration pulse method

2001 ◽  
Vol 79 (2) ◽  
pp. 236-245 ◽  
Author(s):  
Peter J. E. Harlick ◽  
F. Handan Tezel
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherms ◽  
Pulse Method ◽  
Binary Adsorption ◽  
Data Regression ◽  
Concentration Pulse Method

scholarly journals Adsorption Equilibrium of 1, 1-Dichloro-1-fluoroethane (HCFC-141b) on a Hydrophobic Zeolite

1998 ◽  
Vol 16 (2) ◽  
pp. 67-75 ◽  
Author(s):  
Wen-Tien Tsai ◽  
Ching-Yuan Chang ◽  
Chih-Yin Ho
Keyword(s):  
Experimental Data ◽  
Free Energy ◽  
Thermodynamic Properties ◽  
Adsorption Isotherms ◽  
Ozone Depletion ◽  
Adsorption Equilibrium ◽  
Stratospheric Ozone ◽  
Stratospheric Ozone Depletion ◽  
Equilibrium Isotherms ◽  
Entropy Of Adsorption

Of the major replacements for chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) are now accepted as being prime contributors to stratospheric ozone depletion. As a consequence, the development of adsorbents capable of adsorbing and recovering specific HCFCs has received great attention. This paper describes an investigation of the adsorption equilibrium of 1, 1-dichloro-1-fluoroethane (HCFC-141b) vapour on a commercial hydrophobic zeolite. The corresponding Henry, Freundlich and Dubinin–Radushkevich (D–R) equilibrium isotherms have been determined and found to correlate well with the experimental data. Based on the Henry adsorption isotherms obtained at 283, 303 and 313 K. thermodynamic properties such as the enthalpy, free energy and entropy of adsorption have been computed for the adsorption of HCFC-141b vapour on the adsorbent. The results obtained could be useful in the application of HCFC adsorption on the hydrophobic zeolite studied.

scholarly journals Hydrogen Adsorption Isotherms: Modelling of Experimental Data

2006 ◽  
Vol 142 (1-2) ◽  
pp. 83-89 ◽  
Author(s):  
Stefan Tibus ◽  
Jürgen Klier ◽  
Paul Leiderer
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherms ◽  
Hydrogen Adsorption

A new statistical physics model to interpret the binary adsorption isotherms of lead and zinc on activated carbon

2016 ◽  
Vol 214 ◽  
pp. 220-230 ◽  
Author(s):  
Lotfi Sellaoui ◽  
Tolga Depci ◽  
Ali Rıza Kul ◽  
Salah Knani ◽  
Abdelmottaleb Ben Lamine
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherms ◽  
Statistical Physics ◽  
Binary Adsorption ◽  
Lead And Zinc ◽  
Physics Model ◽  
Statistical Physics Model

INFLUENCE OF GEOMETRIC AND ENERGETIC HETEROGENEITY ON ADSORPTION ISOTHERMS

Fractals ◽  
1995 ◽  
Vol 03 (02) ◽  
pp. 235-250 ◽  
Author(s):  
MASSIMILIANO GIONA ◽  
MANUELA GIUSTINIANI ◽  
DOUGLAS K. LUDLOW
Keyword(s):  
Experimental Data ◽  
Simple Model ◽  
Adsorption Isotherms ◽  
Energy Landscape ◽  
Adsorption Equilibria ◽  
Preferential Adsorption ◽  
Consistent Model ◽  
Energetic Heterogeneity ◽  
Adsorption Energies ◽  
Effect Of Surface

The relationships between geometric roughness and energetic heterogeneity are discussed by considering a thermodynamically consistent model of adsorption isotherms (Keller model) which encompasses fractal scaling and the dependence of the adsorption energies on the coverage. Experimental results validate this model and indicate that it can be used not only to interpolate experimental data but also to predict adsorption equilibria of multicomponent rnixtures. The peculiar non-Henry behaviour of the Keller model at low pressure is discussed by considering a simple model of preferential adsorption on a rough energy landscape and including the effect of surface diffusion.

scholarly journals Platinum (IV) Recovery from Waste Solutions by Adsorption onto Dibenzo-30-crown-10 Ether Immobilized on Amberlite XAD7 Resin–Factorial Design Analysis

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3692
Author(s):  
Oana Buriac ◽  
Mihaela Ciopec ◽  
Narcis Duţeanu ◽  
Adina Negrea ◽  
Petru Negrea ◽  
...  
Keyword(s):  
Experimental Data ◽  
Adsorption Capacity ◽  
Thermodynamic Parameters ◽  
Adsorption Isotherms ◽  
Contact Time ◽  
Adsorption Process ◽  
Electrical Contacts ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic

Platinum is a precious metal with many applications, such as: catalytic converters, laboratory equipment, electrical contacts and electrodes, digital thermometers, dentistry, and jewellery. Due to its broad usage, it is essential to recover it from waste solutions resulted out of different technological processes in which it is used. Over the years, several recovery techniques were developed, adsorption being one of the simplest, effective and economical method used for platinum recovery. In the present paper a new adsorbent material (XAD7-DB30C10) for Pt (IV) recovery was used. Produced adsorbent material was characterized by X-ray dispersion (EDX), scanning electron microscopy (SEM) analysis, Fourier Transform Infrared Spectroscopy and Brunauer-Emmett-Teller (BET) surface area analysis. Adsorption isotherms, kinetic models, thermodynamic parameters and adsorption mechanism are presented in this paper. Experimental data were fitted using three non-linear adsorption isotherms: Langmuir, Freundlich and Sips, being better fitted by Sips adsorption isotherm. Obtained kinetic data were correlated well with the pseudo-second-order kinetic model, indicating that the chemical sorption was the rate-limiting step. Thermodynamic parameters (ΔG°, ΔH°, ΔS°) showed that the adsorption process was endothermic and spontaneous. After adsorption, metallic platinum was recovered from the exhausted adsorbent material by thermal treatment. Adsorption process optimisation by design of experiments was also performed, using as input obtained experimental data, and taking into account that initial platinum concentration and contact time have a significant effect on the adsorption capacity. From the optimisation process, it has been found that the maximum adsorption capacity is obtained at the maximum variation domains of the factors. By optimizing the process, a maximum adsorption capacity of 15.03 mg g−1 was achieved at a contact time of 190 min, initial concentration of 141.06 mg L−1 and the temperature of 45 °C.

The Adsorption of Cadmium and Zinc Ions from Waste Waters in Agricultural Argilaceous Soils

2017 ◽  
Vol 68 (3) ◽  
pp. 527-529
Author(s):  
Irina Pincovschi ◽  
Nicoleta Neacsu ◽  
Cristina Modrogan ◽  
Mircea Stefan
Keyword(s):  
Experimental Data ◽  
Thermodynamic Parameters ◽  
Adsorption Isotherms ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Thermodynamic Method ◽  
Zinc Ions ◽  
Waste Waters ◽  
Langmuir Isotherms

The adsorption of cadmium and zinc ions from waste waters in agricultural argilaceaus soils have been studied, using a thermodynamic method in order to put in evidence the influence of adsorption conditions on adsorption degree. The adsorption isotherms, Langmuir and Freundlich, have been used to describe the adsorption equilibrium. The experimental data put in evidence that Cd2+ ions are more adsorbable (about 300 mmol/g) than Zn2+ ones (about 200 mmol/g). The Langmuir isotherms reflect more exactly the adsorption process of both Cd2+and Zn2+ ions, being recommended for thermodynamic parameters determination.

Adsorption of some Weak Organic Electrolytes from Aqueous Solutions on Silica

2007 ◽  
Vol 555 ◽  
pp. 195-200 ◽  
Author(s):  
S.K. Milonjić ◽  
L.K. Zhigunova ◽  
V.Lj. Pavasović
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Adsorption Isotherms ◽  
Water Purification ◽  
Maximum Amount ◽  
Substituted Phenols ◽  
Batch Method ◽  
Organic Electrolytes ◽  
Method Effects ◽  
Ph Range

The adsorption of organic electrolytes from aqueous solutions on various adsorbents has been frequently investigated because of its importance in water purification. Phenol and substituted phenols are very common contaminants of water. In this paper, the adsorption results of some weak organic electrolytes (hydrochinon, phloroglucin and acidum gallicum) from aqueous solutions on silica are presented. The adsorption of the organics was investigated by the batch method. Effects of solution pHs (in the 2-10 range) and concentrations of these compounds on the adsorption were investigated. In the case of acidum gallicum, adsorption isotherms (in the 2-6 pH range) were determined. The obtained results indicate that the amount of adsorbed acidum gallicum increases with its increasing concentration. The maximum adsorption was recorded at pH=2-3 (pH equal to pHpzc of SiO2) with acidum gallicum molecule being undissociated (pKa= 4.41). The experimental data were fitted with different adsorption isotherms models. The maximum amount of acidum gallicum adsorbed as well as the Freundlich constants of adsorption were calculated. The adsorption of hydrochinon and phloroglucin from aqueous solutions (in the investigated pH range) on silica was negligible.

Binary Adsorption Isotherms of Water and Ethyl Acetate Vapor for Materials Contained in a Box of a Tobacco Product

1995 ◽  
Vol 13 (8-9) ◽  
pp. 1741-1761 ◽  
Author(s):  
Masato Miyauchi ◽  
Atsuko Miyake ◽  
Yukio Nakanishi ◽  
Yasuyuki Sagara
Keyword(s):  
Ethyl Acetate ◽  
Adsorption Isotherms ◽  
Tobacco Product ◽  
Binary Adsorption

scholarly journals BET-Type Adsorption Isotherms for Gaseous Mixtures

2005 ◽  
Vol 23 (6) ◽  
pp. 487-496 ◽  
Author(s):  
Maciej Jabłoński
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherms ◽  
Active Carbon ◽  
Solid Surfaces ◽  
Gaseous Mixtures ◽  
Methanol Mixture ◽  
Adsorbed Layers ◽  
Bet Theory ◽  
Additional Assumptions

A formalism for describing the adsorption of gaseous mixtures at solid surfaces was derived as an extension of the BET theory. The following additional assumptions were made; the composition of all the adsorbed layers is the same and interaction occurs between the component molecules in the adsorbed layers. The proposed equations were compared with the experimental data obtained from measurements of the adsorption of an acetone—methanol mixture onto N-type active carbon.

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