scholarly journals Selective Adsorption of Europium on Activated Charcoal from Aqueous Solutions

1992 ◽  
Vol 9 (1) ◽  
pp. 1-16 ◽  
Author(s):  
M. Saleem ◽  
M. Afzal ◽  
RiaZ Qadeer ◽  
Javed Hanif
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Activated Charcoal ◽  
Selective Adsorption ◽  
Fluorescence Spectrometry ◽  
Thermodynamic Quantities ◽  
X Ray ◽  
Europium Concentration ◽  
Ph Concentration

The adsorption of europium on activated charcoal has been studied as a function of shaking time, pH, concentration of adsorbate and temperature. The adsorption of europium obeys the Langmuir and Dubinin-Radushkevich isotherms. Thermodynamic quantities such as ΔH0 and ΔS0 have been calculated from the slopes and intercepts of plots of In KD versus 1/T. The influence of different cations and anions on europium adsorption has been examined. The adsorption of other metal ions on activated charcoal has been investigated under specified conditions to check their selectivity for europium. As a result, europium has been successfully removed from a mixture containing Ba, Sr, Ru, Cs, Cr, Nd, Pr and In. Approximately 96% of the europium adsorbed on the activated charcoal was recovered using 45 ml of 3 M HNO3. X-ray fluorescence spectrometry was used for measuring the europium concentration.

Selective Adsorption of Strontium on Activated Charcoal from Electrolytic Aqueous Solutions

1992 ◽  
Vol 57 (10) ◽  
pp. 2065-2072 ◽  
Author(s):  
Riaz Qadeer ◽  
Javed Hanif ◽  
Muhammad Saleem ◽  
Muhammad Afzal
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Activated Charcoal ◽  
Selective Adsorption ◽  
X Ray ◽  
Langmuir Isotherms ◽  
Strontium Concentration ◽  
Fluorescence Spectrometer ◽  
Ph Concentration

The adsorption of strontium on activated charcoal has been studied as a function of shaking time, pH, concentration of adsorbate and temperature. Wavelength dispersive X-ray fluorescence spectrometer was used for measuring strontium concentration. The adsorption of strontium obeys Freundlich and Langmuir isotherms. Quantities ∆H0 and ∆S0 were calculated from the slope and intercept of plot ln KD vs 1/T. The influence of different cations and anions on strontium adsorption has been examined. The adsorption of other metal ions on activated charcoal has been studied under specific conditions to check its selectivity. Consequently, strontium was removed from Rh, Pr, Rb and Cs. More than 95% adsorbed strontium on activated charcoal can be recovered with 65 ml 3M HNO3 solution.

scholarly journals The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 626 ◽  
Author(s):  
Salah ◽  
Gaber ◽  
Kandil
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Langmuir Isotherm ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Solution Ph ◽  
X Ray ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The sorption of uranium and thorium from their aqueous solutions by using 8-hydroxyquinoline modified Na-bentonite (HQ-bentonite) was investigated by the batch technique. Na-bentonite and HQ-bentonite were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared (FTIR) spectroscopy. Factors that influence the sorption of uranium and thorium onto HQ-bentonite such as solution pH, contact time, initial metal ions concentration, HQ-bentonite mass, and temperature were tested. Sorption experiments were expressed by Freundlich and Langmuir isotherms and the sorption results demonstrated that the sorption of uranium and thorium onto HQ-bentonite correlated better with the Langmuir isotherm than the Freundlich isotherm. Kinetics studies showed that the sorption followed the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° indicated that the sorption of uranium and thorium onto HQ-bentonite was endothermic, feasible, spontaneous, and physical in nature. The maximum adsorption capacities of HQ-bentonite were calculated from the Langmuir isotherm at 303 K and were found to be 63.90 and 65.44 for U(VI) and Th(IV) metal ions, respectively.

Selective Adsorption of Uranium on Activated Charcoal from Electrolytic Aqueous Solutions

1992 ◽  
Vol 27 (2) ◽  
pp. 239-253 ◽  
Author(s):  
M. Saleem ◽  
M. Afzal ◽  
Riaz Qadeer ◽  
Javed Hanif
Keyword(s):  
Aqueous Solutions ◽  
Activated Charcoal ◽  
Selective Adsorption

scholarly journals Effect of Different Cations on the Adsorption of Dy3+, Gd3+, Eu3+ and Sm3+ Ions on Activated Charcoal from Aqueous Solutions

1996 ◽  
Vol 13 (1) ◽  
pp. 27-29
Author(s):  
Riaz Qadeer ◽  
Imtiaz Hanif ◽  
Javed Hanif
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Charge Density ◽  
Activated Charcoal ◽  
Room Temperature ◽  
Adsorption Of Metal Ions ◽  
R Value

The effect of different cations on the adsorption of Dy3+, Gd3+, Eu3+ and Sm3+ ions on activated charcoal from aqueous solutions (pH = 4.0) has been studied at room temperature (295 ± 1 K). Their effect on the adsorption of the metal ions has been correlated with the charge density (Z/r) of the cations. It was observed that cations with a larger Z/r value reduced the adsorption of metal ions more than cations with smaller Z/r values. It was also observed that the ease of adsorption of the metal ions followed the sequence: Dy3+ > Gd3+ > Eu3+ > Sm3+. Such data are important in relation to the recovery of metal ions from solution.

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