scholarly journals Adsorption Equilibria in Carbon/Hydrocarbon/Water Systems

1997 ◽  
Vol 15 (2) ◽  
pp. 109-114 ◽  
Author(s):  
N.A. Eltekova ◽  
Yu.A. Eltekov
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons ◽  
Water Systems ◽  
Purification Process ◽  
Volume Filling ◽  
Liquid Phase Adsorption ◽  
Adsorption Equilibria ◽  
Good Accord ◽  
Benzene Toluene ◽  
Experimental Values

Two equations derived from the theory of volume filling of micropores (the DR and DS equations) were used for the description of the liquid-phase adsorption of benzene, toluene and p-xylene from aqueous solution on to two commercial microporous activated carbons. Comparison of the experimental and calculated adsorption isotherms showed good accord between the theoretical and experimental values. The results of this work indicate that the parameters of these equations can be used for modelling a water purification process based on the activated carbons.

scholarly journals Equilibrium Adsorption of Two-Component Organic Solutes from Aqueous Solutions on Activated Carbon

1986 ◽  
Vol 3 (3) ◽  
pp. 189-199 ◽  
Author(s):  
A. Seidel ◽  
G. Reschke ◽  
S. Friedrich ◽  
D. Gelbin
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Relative Concentration ◽  
The Other ◽  
Organic Solutes ◽  
Predictive Equations ◽  
Adsorption Equilibria ◽  
Two Component ◽  
Adsorption Data ◽  
Experimental Values

The adsorption equilibria of the mixtures phenol-indol, indol- p-nitrophenol ( pNP), α-picoline-phenol from aqueous solution on activated carbon, mainly Hydraffin 71 and BHT 023/82 have been studied. Significant displacement of one solute by the other was observed. The designation of the more strongly adsorbed component depends on the relative concentration of the two solutes in the mixture and on the pH. Predictive equations for calculating mixture equilibria solely on the basis of single solute isotherms do not agree well with the experimental values; the introduction of empirical parameters determined by curve-fitting is necessary. A multi-Redlich-Peterson equation is derived, which yields a satisfactory representation of most of the present binary solute adsorption data.

scholarly journals Adsorption of CCl4 from Aqueous Solution on Activated Carbons

2000 ◽  
Vol 18 (9) ◽  
pp. 823-837 ◽  
Author(s):  
Eugeniusz Milchert ◽  
Waldemar Goc ◽  
Robert Pelech
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons

scholarly journals Removal of Ni (II) from Aqueous Solution by Adsorption onto Activated Carbon Prepared from Lapsi (Choerospondias axillaris) Seed Stone

2014 ◽  
Vol 9 (1) ◽  
pp. 166-174 ◽  
Author(s):  
Rajeshwar M. Shrestha ◽  
Margit Varga ◽  
Imre Varga ◽  
Amar P. Yadav ◽  
Bhadra P. Pokharel ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Activated Carbons ◽  
Low Cost ◽  
Chemical Characterization ◽  
Maximum Adsorption Capacity ◽  
Adsorption Data ◽  
Optimum Ph ◽  
Nickel Adsorption

Activated carbons were prepared from Lapsi seed stone by the treatment with H2SO4 and HNO3 for the removal of Ni (II) ions from aqueous solution. Two activated carbon have been prepared from Lapsi seed stones by treating with conc.H2SO4 and a mixture of H2SO4 and HNO3 in the ratio of 1:1 by weight for removal of Ni(II) ions. Chemical characterization of the resultant activated carbons was studied by Fourier Transform Infrared Spectroscopy and Boehm titration which revealed the presence of oxygen containing surface functional groups like carboxyl, lactones and phenols in the carbons. The optimum pH for nickel adsorption is found to be 5. The adsorption data were better fitted with the Langmuir equations than Freundlich adsorption equation to describe the equilibrium isotherms. The maximum adsorption capacity of Ni (II) on the resultant activated carbons was 28.25.8 mg g-1 with H2SO4 and 69.49 mg g-1 with a mixture of H2SO4 and HNO3. The waste material used in the preparation of the activated carbons is inexpensive and readily available. Hence the carbons prepared from Lapsi seed stones can act as potential low cost adsorbents for the removal of Ni (II) from water. DOI: http://dx.doi.org/10.3126/jie.v9i1.10680Journal of the Institute of Engineering, Vol. 9, No. 1, pp. 166–174

Liquid-phase adsorption equilibria

AIChE Journal ◽  
1958 ◽  
Vol 4 (4) ◽  
pp. 383-388 ◽  
Author(s):  
Edward B. Stuart ◽  
James Coull
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Adsorption ◽  
Adsorption Equilibria

Removal of reactive dye (BEZAKTIV Red S-MAX) from aqueous solution by adsorption onto activated carbons prepared from date palm rachis and jujube stones

2017 ◽  
Vol 243 ◽  
pp. 799-809 ◽  
Author(s):  
Mounir Daoud ◽  
Oumessaâd Benturki ◽  
Zoubida Kecira ◽  
Pierre Girods ◽  
André Donnot
Keyword(s):  
Aqueous Solution ◽  
Date Palm ◽  
Activated Carbons ◽  
Reactive Dye

Comparison of Coal Ash and Activated Carbon for Removal of Humic Acid from Aqueous Solution

2013 ◽  
Vol 864-867 ◽  
pp. 1509-1512
Author(s):  
Xue Mei Zhang ◽  
Yan Zhang ◽  
Di Fan
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Activated Carbons ◽  
Removal Rate ◽  
Coal Ash ◽  
Cost Effective ◽  
Solution Ph ◽  
Adsorption Behaviors ◽  
Calcium Loading ◽  
Working Solution

This paper presents the adsorption behaviors of humic acid (HA) on coal ashes and powdered activated carbons (PACs). A bituminous coal, with or without calcium-loading, was used as a feedstock for coal ash preparation. The working solution of HA with a concentration of 20 mg/L was used in all adsorption tests. The results showed that calcium-enriched coal ash (CECA) gave rise to the removal rate of HA as high as 84.05%, much higher than those of raw coal ash (RCA) and PACs. The impacts of solution pH and adsorbent dosage on HA adsorption capacity were also investigated. It was found that lower pH facilitated to the removal of HA from aqueous solution by means of CECA, and the optimal CECA dosage was about 1.0g/L at pH 7.00. The data obtained in this study suggested that calcium-enriched coal ash could be useful and cost-effective in the treatment of wastewaters containing HA-like organic macro-molecules.

scholarly journals Structure and Dynamics of Zr4+ in Aqueous Solution: An Ab Initio QM/MM Molecular Dynamics Study

2015 ◽  
Vol 15 (2) ◽  
pp. 155-162 ◽  
Author(s):  
Suwardi Suwardi ◽  
Harno Dwi Pranowo ◽  
Ria Armunanto
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solution ◽  
Distribution Function ◽  
Pair Potential ◽  
Structural Data ◽  
Angular Distribution Function ◽  
Dilute Aqueous Solution ◽  
Dynamical Properties ◽  
Experimental Values ◽  
Three Body

A QM/MM molecular dynamics (MD) simulation has been carried out using three-body corrected pair potential to investigate the structural and dynamical properties of Zr4+ in dilute aqueous solution. Structural data in the form of radial distribution function, coordination number distribution, and angular distribution function were obtained. The results indicate eight water molecules coordinate to zirconium ion and have two angles of O-Zr4+-O, i.e. 72.0° and 140.0° with a Zr4+-O distance of 2.34 Å. According to these results, the hydration structure of Zr4+ ion in water was more or less well-defined square antiprismatic geometry. The dynamical properties have been characterized by the ligand’s mean residence time (MRT) and Zr4+-O stretching frequencies. The inclusion of the three-body correction was important for the description of the hydrated Zr4+ ion, and the results indicated in good agreement with experimental values.

scholarly journals Adsorption of lisinopril and chlorpheniramine from aqueous solution on dehydrated and activated carbons

2016 ◽  
Vol 19 ◽  
pp. 12-22 ◽  
Author(s):  
El-Said I. El-Shafey ◽  
Haider A. J. Al-Lawati ◽  
Wafa S. H. Al-Saidi
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons
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