scholarly journals RESEARCH ON ION EXCHANGE CAPACITY OF OXIDIZEDACTIVATED CARBON

2018 ◽  
Vol 55 (4C) ◽  
pp. 245
Author(s):  
Pham Thi Hai Thinh
Keyword(s):  
Activated Carbon ◽  
Ion Exchange ◽  
Surface Treatment ◽  
Adsorption Capacity ◽  
Inorganic Compounds ◽  
Exchange Capacity ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Ion Exchange Capacity ◽  
Naoh Solution

Ion exchange capacity of oxidized activated carbon (OAC) by HNO3 and surface treatment by NaOH solution was investigated. The HNO3oxidizedfunctional groups on the activated carbon surface, such as ketone, carboxylic acid and its derivatives, to maximum oxidation state. The OAC surface played the role as cation exchanger for adsorption of inorganic compounds, especially metallic cations. The adsorption capacity of OAC was investigated in batch mode with three representative ions with different valence from +1 to +3 (NH4+, Ca2+, Cr3+). The adsorption process was demonstrated by Langmuir and Freundlich isothermal model, and the maximum adsorption capacity according to Langmuir isothrermal equation was 20.4 mg/g for NH4+, 43.5 mg/g for Ca2+ and 38.5 mg/g for Cr3+. The results showed the OAC modified by HNO3 and surface treatment by NaOH solution improved adsorption capacity of AC for cations in solution to a higher level. 

Adsorption of cadmium(II) from aqueous solution onto activated carbon

1997 ◽  
Vol 35 (7) ◽  
pp. 205-211 ◽  
Author(s):  
R. Leyva-Ramos ◽  
J. R. Rangel-Mendez ◽  
J. Mendoza-Barron ◽  
L. Fuentes-Rubio ◽  
R. M. Guerrero-Coronado
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Ph Values ◽  
Average Percent Deviation ◽  
Initial Ph

The adsorption isotherm of cadmium on activated carbon was measured in a batch adsorber. Effects of temperature and solution pH on the adsorption isotherm were investigated by determining the adsorption isotherm at temperatures of 10, 25, and 40°C and at initial pH values from 2 to 8. Langmuir isotherm better fitted the experimental data since the average percent deviation was lower than with the Freundlich isotherm It was noticed that the amount of Cd2+ adsorbed was reduced about 3 times by increasing the temperature from 10 to 40°C. It was found that Cd2+ was not adsorbed on activated carbon at pH of 2 or lower and that Cd2+ was precipitated out as Cd(OH)2 at pH values above 9. Maximum adsorption capacity was observed at pH of 8 and the adsorption capacity was decreased about 12 times by reducing the initial pH from 8 to 3. According to the cadmium speciation diagram the predominant species below pH of 8 is Cd2+. Thus, cadmium was adsorbed on the activated carbon surface as Cd2+. It was concluded that the adsorption capacity is a strong function of pH and temperature.

scholarly journals ADSORPSI ZAT WARNA METILEN BIRU DENGAN KARBON AKTIF DARI KULIT DURIAN MENGGUNAKAN KOH DAN NaOH SEBAGAI AKTIVATOR

2017 ◽  
Vol 6 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Farida Hanum ◽  
Rikardo Jgst Gultom ◽  
Maradona Simanjuntak
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Contact Time ◽  
Wavelength Region ◽  
Second Order ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Activation Process ◽  
Maximum Surface

Durian is a kind of tropical fruits which can grow well in Indonesia. Durian is containing 60-75% shell. Durian shell could be a potential alternative to activated carbon because it contains 57.42% carbon. The aim of this research is to know the effect of contact time and  stirring speed to activated carbon adsorption capacity from durian shell with KOH and NaOH as activators. FTIR (Fourier Transform Infra Red) analysis showed the activation process effects on  absorption intensity  wavelength region and resulted in formation of C = C aromatic tape, so that the nature of the charcoal becomes more polar compared with the initial condition. Analysis using spectrophotometer UV-Vis to determine  absorbance and  final concentration of each variation of contact time and stirring speed. The results showed that the maximum adsorption capacity obtained by activation of KOH and NaOH on stirring speed of 150 rpm and a contact time of 90 minutes is equal to 3.92 mg / g and 3.8 mg / g respectively. The maximum surface area obtained by activation of KOH and NaOH during the stirring speed 130 rpm and a contact time of 120 minutes is equal to 1785.263 m2 / g and 1730.332 m2 / g respectively. The maximum surface area obtained from this research has met the standards of commercial activated carbon surface area was between 800-1800 m2/ g. Modeling pseudo second order presents a more representative adsorption data, a second order equation is based on the assumption that adsorption step is chemosorption.

scholarly journals Application of Activated Carbon for the Sorption of Some Heavy Metals from Aqueous Solution and Their Determination by Atomic Spectroscopy

1996 ◽  
Vol 14 (1) ◽  
pp. 47-57 ◽  
Author(s):  
A. Gierak
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Sorption Isotherms ◽  
Hydrogen Atmosphere ◽  
Exchange Capacity ◽  
Atomic Spectroscopy ◽  
Carbon Surface ◽  
Active Carbons ◽  
Ion Exchange Capacity ◽  
Basic Characteristics

This paper presents investigations on the possible application of Polish active carbons, obtained by the carbonization of plum stones, in the sorption and preconcentration of selected heavy metal ions, i.e. FeIII, PbII, NiII, ZnII, CoII and CdII, from aqueous solution. The effect of modifying the active carbon surface with oxidizing (HNO3, H2O, air and steam) and reducing (H2) agents on the sorption and ion-exchange capacity of the carbon was examined. The basic characteristics of the porous structure of the tested adsorbents, as well as their ion-exchange capacities towards cations and anions, were determined. In addition, the sorption isotherms of individual ions in the concentration range 10−4–10−2 mol/1, as well as the effect of the pH of the solution on the sorption of the ions, were investigated. As far as the utilization of the prepared sorbents to isolate and preconcentrate trace amounts of tested ions is concerned, the best results were obtained for active carbons thermally treated at 800°C in a hydrogen atmosphere.

scholarly journals Investigate the adsorption of cesium ion (Cs+) on Zn2[Fe(CN)6] AND Zn3[Fe(CN)6]2 nanoparticles

2020 ◽  
Vol 3 (4) ◽  
pp. 307-316
Author(s):  
Nguyen Dinh Trung ◽  
Le Thi Ha Lan ◽  
Truong Dong Phuong
Keyword(s):  
Ion Exchange ◽  
Adsorption Capacity ◽  
Exchange Capacity ◽  
Ion Concentration ◽  
Experimental Conditions ◽  
Ion Exchange Capacity ◽  
Freundlich Isotherms ◽  
Ion Absorption ◽  
Adsorption Data ◽  
Ph Range

Adsorption of Cs+ ion from aqueous solution by Zn2[Fe(CN)6] and Zn3[Fe(CN)6]2 nanoparticle, and the effect of experimental conditions on the adsorption were investigated. Preliminary results showed that two materials were very efficient as an absorbent. Zn2[Fe(CN)6] and Zn3[Fe(CN)6]2 nanoparticle adsorbents for removal Cs+ion from solution have been successfully synthesized. Comparison between two materials, the Cs + ion adsorption capacity of Zn2[Fe(CN)6] was higher than Zn3[Fe(CN)6]2 and the reaction time was shorter. The adsorption equilibrium time of Zn3[Fe(CN)6]2 was about 20 hours, and the suitable pH range 3-7 while the Zn2[Fe(CN)6] was 15 minutes. The Cs+ ion absorption by Zn2[Fe(CN)6] nanoparticle follow the ion exchange mechanism, the best exchange capacities of the material were in the pH 3-5 range, ion exchange capacity depended on the pH, the maximum ion exchange capacity of the material at pH = 4 was 1.01 meq (Cs+) / g. After 15 min, about 98% of initial Cs+ ion concentration was removed from the solution; the adsorption data did not accord with Langmuir and Freundlich isotherms. The high adsorption capacity and good performance on other aspects, make the Zn2[Fe(CN)6] nanoparticle a promising adsorbent for the removal of Cs+ ion from water.

scholarly journals CO2 adsorption on pristine, oxidized, and diethylamine-functionalized activated carbon sorbents

2020 ◽  
Vol 154 ◽  
pp. 07001
Author(s):  
Vitaly E. Diyuk ◽  
Alexander N. Zaderko ◽  
Liudmyla M. Grischenko ◽  
Galyna G. Tsapyuk ◽  
Anna V. Vakaliuk ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Co2 Adsorption ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Thermogravimetric Method ◽  
Capture Process ◽  
Sorbent Regeneration ◽  
Texture Parameters ◽  
Adsorption Of Co

Adsorption is currently the most promising capture technology to shorten atmospheric emissions of carbon dioxide (CO2). In this article, we report on the adsorption of CO2 onto pristine, oxidized, and aminated activated carbon (AC) sorbents. From our findings, some functionalized AC sorbents have shown very promising results in the CO2 capture process. Their maximum adsorption capacity measured by the thermogravimetric method at 20 °C varies between 2.2 and 3.9 mmol CO2/g depending on the content of diethylamino and oxygen-containing groups. The functionalization of the carbon surface with diethylamino groups improves the adsorption capacity by 30–40%. The CO2 adsorption little depends on the texture parameters of the pristine AC sorbents. In the range from 20 to 100 °C, the CO2 thermodesorption showed the effective regeneration of the sorbents. The aminated carbon surface demonstrates the best CO2 adsorption but binds the adsorbed molecules stronger than the oxidized surface, which limits the sorbent regeneration.

scholarly journals Amenability of Carboxylic Acids Adsorption on Surface of Activated Carbon

2015 ◽  
Vol 58 (2) ◽  
pp. 106-110
Author(s):  
Tayyba Aftab ◽  
Naeem Abbas ◽  
Muhammad Irfan ◽  
Farah Deeba ◽  
Naz Imtiaz ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Benzoic Acid ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Propionic Acid ◽  
Butyric Acid ◽  
Contact Time ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Residual Concentration

The objective of the present study was to investigate the adsorption of benzoic acid (BA), valeric acid (VA), propionic acid (PA) and butyric acid (BUA) from aqueous solutions at different dosing rate on the surface of activated carbon. Different trials were taken in order to determine the interaction betweenthe carbon surface and adsorbent species. The residual concentration of acids was calculated by the titrimetric method. Maximum adsorption capacity was found to be 93.37% at dosing rate of 8.75 g for BUA and minimum adsorption capacity was measured as 41.47% at dosing rate of 0.69 g for VA. Keeping the same contact time and mass of activated carbon (2.8 g), the adsorption capacity increases with increasing dosing rate. 

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Sign in / Sign up

Export Citation Format

Share Document