scholarly journals Study of Adsorption from Dilute Aqueous Solutions on to Activated Carbon. Part 2. Some Exotic Adsorption Isotherms

1996 ◽  
Vol 13 (5) ◽  
pp. 341-354
Author(s):  
R. Mészáros ◽  
M. Nagy ◽  
G. Veress
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherms ◽  
Equilibrium Concentration ◽  
Model Description ◽  
Adsorption Data ◽  
Dilute Aqueous Solution ◽  
Dilute Aqueous Solutions ◽  
Error Terms ◽  
Concentration Curves ◽  
Supernatant Solution

Adsorption isotherms for the adsorption of 1-propanol and 2-propanol from dilute aqueous solution on to two types of activated carbon were presented at fixed different initial concentrations. The confidence limits for the specific excess relative to these fixed initial concentrations were also given. The high precision calculation of these error terms was based on the model description of the equilibrium concentration versus sorbent concentration curves discussed previously. The Dubinin–Radushkevich representation of the adsorption data was presented and tested for the same adsorption data. It appears that in some cases the adsorbed amount as expressed by the specific excess depends not only on the equilibrium concentration of the supernatant solution but also on the initial concentration and sorbent concentration. The so-called characteristic isotherms were also calculated in order to compare the various adsorption systems.

scholarly journals Removal of Phenol ando-Cresol by Adsorption onto Activated Carbon

2008 ◽  
Vol 5 (2) ◽  
pp. 224-232 ◽  
Author(s):  
A. Edwin Vasu
Keyword(s):  
Activated Carbon ◽  
Kinetic Studies ◽  
Batch Mode ◽  
Phenol Solution ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Dilute Aqueous Solutions ◽  
Isotherm Equations

A commercial activated carbon was utilized for the adsorptive removal of phenol and o-cresol from dilute aqueous solutions. Batch mode adsorption studies were performed by varying parameters such as concentration of phenol solution, time, pH and temperature. The well known Freundlich, Langmuir and Redlich-Peterson isotherm equations were applied for the equilibrium adsorption data and the various isotherm parameters were evaluated. The Langmuir monolayer adsorption capacities were found to be 0.7877 and 0.5936 mmole/g, respectively, for phenol and o-cresol. Kinetic studies performed indicate that the sorption processes can be better represented by the pseudo-second order kinetics. The processes were found to be endothermic and the thermodynamic parameters were evaluated. Desorption studies performed indicate that the sorbed phenol molecules can be desorbed with dil. HCl.

Adosorption of Basic Fuchsin onto Xanthoceras Sorbifolia Bunge Crust Activated Carbon Developed by Sodium Hydroxide

2010 ◽  
Vol 156-157 ◽  
pp. 272-278 ◽  
Author(s):  
Yi Nan Hao ◽  
Xi Ming Wang
Keyword(s):  
Activated Carbon ◽  
Sodium Hydroxide ◽  
Adsorption Isotherms ◽  
Equilibrium Concentration ◽  
Langmuir Equation ◽  
Basic Fuchsin ◽  
Freundlich Isotherms ◽  
Different Temperatures ◽  
Endothermic Process ◽  
Pseudo Second Order

Xanthoceras Sorbifolia Bunge crust was used as source material to make carbon by chemically impregnated by sodium hydroxide、carbonized at 220°C and activated under the protection of the nitrogen. Experiments were carried out as function of contact time, pH (4-10) and temperature (293,303 and 313K). Adsorption isotherms were modeled with the Langmuir and Freundlich isotherms. Adsorption isotherms of Basic Fuchsin on Xanthoceras Sorbifolia Bunge crust activated carbon are consistent with Langmuir equation. The Langmuir monolayer saturation capacities of BF adsorbed onto activated carbon were 286.545, 303.617 and 323.816 mg/g at 293,303, and 313 K, respectively.and adsorption kinetics were found to conform to the pseudo-second-order kinetics with good correlation.Using the equilibrium concentration contents obtained at different temperatures, various thermodynamic parameters,such as △G,△H and △S, have been calculated. The thermodynamics parameters of system indicated spontaneous and endothermic process.

scholarly journals Study of Adsorption from Dilute Aqueous Solutions on to Activated Carbon. Part 1. Novel Representation of Experimental Data

1996 ◽  
Vol 13 (5) ◽  
pp. 327-340 ◽  
Author(s):  
R. Mészáros ◽  
M. Nagy ◽  
G. Veress
Keyword(s):  
Experimental Data ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Functional Relationship ◽  
Activated Carbons ◽  
Good Description ◽  
Equilibrium Concentration ◽  
Dilute Aqueous Solutions ◽  
The Given

The dependence of the equilibrium concentration of dilute aqueous solutions of 1-propanol and 2-propanol on the mass of adsorbent for two types of activated carbon was investigated at fixed initial concentrations. Two kinds of differential equation were proposed for the characterization of these curves. The solution functions of the given differential equations were fitted to the experimental data. The second model was accepted as providing a good description of the required functional relationship. The similarity and differences in the values of the constants relative to the functions arising from the accepted model were also discussed for the two types of activated carbons.

scholarly journals Comparative studies on the removal of copper (II) by Ulva fasciata activated carbon and commercially activated carbon

2012 ◽  
Vol 14 (4) ◽  
pp. 88-94 ◽  
Author(s):  
R.P. Suresh Jeyakumar ◽  
V. Chandrasekaran
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Synthetic Wastewater ◽  
Batch Adsorption ◽  
First Order ◽  
Ulva Fasciata ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Pseudo First Order ◽  
Adsorbent Dose

Abstract In this work, the efficiency of Ulva fasciata sp. activated carbons (CCUC, SCUC and SSUC) and commercially activated carbon (CAC) were studied for the removal of Cu (II) ions from synthetic wastewater. Batch adsorption experiments were carried out as a function of pH, contact time, initial copper concentration and adsorbent dose. The percentage adsorption of copper by CCUC, SSUC, SCUC and CAC are 88.47%, 97.53%, 95.78% and 77.42% respectively. Adsorption data were fitted with the Langmuir, Freundlich and Temkin models. Two kinetic models pseudo first order and the pseudo second order were selected to interpret the adsorption data.

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

Adsorption isotherms ofm-xylene on activated carbon: measurements and correlation with different models

2000 ◽  
Vol 32 (3) ◽  
pp. 401-411 ◽  
Author(s):  
Jamal Benkhedda ◽  
Jean-Noël Jaubert ◽  
Danielle Barth ◽  
Laurent Perrin ◽  
Michel Bailly
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherms

scholarly journals Ricinus CommunisPericarp Activated Carbon Used as an Adsorbent for the Removal of Ni(II) From Aqueous Solution

2008 ◽  
Vol 5 (4) ◽  
pp. 761-769 ◽  
Author(s):  
S. Madhavakrishnan ◽  
K. Manickavasagam ◽  
K. Rasappan ◽  
P. S. Syed Shabudeen ◽  
R. Venkatesh ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Activated Carbon ◽  
Contact Time ◽  
Metal Ion ◽  
Ricinus Communis ◽  
Ion Concentration ◽  
Batch Mode ◽  
Adsorption Data ◽  
Initial Ph

Activated carbon prepared from Ricinus communis Pericarp was used to remove Ni(II) from aqueous solution by adsorption. Batch mode adsorption experiments are carried out by varying contact time, metal-ion concentration, carbon concentration and pH to assess kinetic and equilibrium parameters. The adsorption data were modeled by using both Langmuir and Freundlich classical adsorption isotherms. The adsorption capacity (Qo) calculated from the Langmuir isotherm was 31.15 mg/g of activated carbon at initial pH of 5.0±0.2 for the particle size 125-250 µm.

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