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 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.

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.

Removal of Cadmium Ions from Aqueous Solution by Nanostructured Carbonated Fluorapatite Bearing Siliceous Phosphorite

2013 ◽  
Vol 712-715 ◽  
pp. 482-486
Author(s):  
He Bin Shi ◽  
Yu Liu ◽  
Hong Zhong ◽  
Xing Tian ◽  
Ming Hang Liao
Keyword(s):  
Aqueous Solutions ◽  
Gangue Mineral ◽  
Order Kinetic ◽  
X Ray ◽  
Simulated Waste ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Infrared Spectrometer ◽  
Pseudo Second Order ◽  
Fluorescence Spectrometer

A middle grade siliceous phosphorite from Yunnan province was selected to treat Cd2+ bearing aqueous solutions. The siliceous phosphorite was tested by X-ray fluorescence spectrometer, X-ray diffraction, infrared spectrometer and scanning electron microscopy. The results present that the valuable mineral is nanostructured carbonated fluorapatite and the major gangue mineral is quartz. The amount of Cd2+ sorbed by the siliceous phosphorite tends to increase with the increase of initial pH or the initial Cd2+ concentration of the simulated waste water. The reaction process of Cd2+ removal from aqueous solutions is highly fitted with the pseudo-second order kinetic model. The results indicate that nanostructured carbonated fluorapatite bearing siliceous phosphorite can effectively immobilize aqueous Cd2+.

scholarly journals Synthesis of highly active Cu(I)-Y(III)-Y zeolite and its selective adsorption desulfurization performance in presence of xylene isomers

2020 ◽  
Author(s):  
Bo-Long Jiang ◽  
Nan Jiang ◽  
You-Xin Chang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Selective Adsorption ◽  
Sulfur Removal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Highly Active ◽  
Adsorption Desulfurization ◽  
Para Xylene ◽  
Xylene Isomers ◽  
Fluorescence Spectrometer

Abstract Abstract A bimetal-exchanged NaY zeolite (Cu(I)-Y(III)-Y) with a desirable adsorptive desulfurization (ADS) performance was prepared and characterized by means of X-ray diffraction, specific surface area measurements, X-ray fluorescence spectrometer, X-ray photoelectron spectroscopy, thermal gravity analysis and Fourier transform infrared spectroscopy. The effect of Y(III) ions on ADS in the presence of the xylenes was investigated. Results indicated that the ADS performance of Y(III)-Y is higher than that of most reported CeY. The Y(III)-based Cu(I)-Y(III)-Y demonstrated the higher breakthrough loading than those of reported Ce(III)/Ce(IV)-based transition metal Y zeolites, showing that Y(III) ions play a promoting role in improving the ADS selectivity. For Cu(I)-Y(III)-Y, a new strong S-M interaction (S stands for sulfur, while M stands for metal) active site was formed, which might be caused by the synergistic effect between Cu(I) and Y(III). The Cu(I)-Y(III)-Y, which combined the advantages of Cu(I)-Y and Y(III)-Y, is a kind of promising adsorbent. The breakthrough loading decreased in the order of Cu(I)-Y(III)-Y > Y(III)-Y > Cu(I)-Y, and the effect of xylene isomers on the sulfur removal was in the order of ortho-xylene > meta-xylene > para-xylene, which exhibited the same trend with the bond order of xylenes.

Fabrication of magnetic functionalised calix[4]arene composite for highly efficient and selective adsorption towards uranium(VI)

2019 ◽  
Vol 16 (8) ◽  
pp. 577 ◽  
Author(s):  
Fang-Zhu Xiao ◽  
Cheng Wang ◽  
Li-Mei Yu ◽  
Yi-Qiu Pu ◽  
Yu-Li Xu ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Self Assembly ◽  
Selective Adsorption ◽  
X Ray Diffraction ◽  
Kinetics And Thermodynamics ◽  
X Ray ◽  
Practical Applications ◽  
Assembly Method ◽  
Magnetic Fe3o4 ◽  
Scanning Electron

Environmental contextUranium-containing wastewaters have high potential to harm the environment and human health. We found that the combination of calix[4]arene with magnetic Fe3O4 particles produced good adsorption of uranium from wastewater. In addition, this material can be recycled and reused, so it has good prospects in practical applications for uranium remediation. AbstractA magnetic functionalised calix[4]arene composite consisting of Fe3O4 and calix[4]arene phosphonate derivative (CPD) was prepared through a facile self-assembly method. The composite was characterised by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR). The as-synthesised Fe3O4/CPD composite was used to remove UVI from aqueous solutions under different conditions. Meanwhile, the adsorption isotherm, kinetics and thermodynamics were fitted and analysed. The results show that the Fe3O4/CPD composite may be a promising adsorption material for the separation and enrichment of UVI from aqueous solutions in the cleanup of environmental pollution.

scholarly journals INDIUM EXTRACTION FROM SOLUTIONS WITH MODIFIED ALUMINOSILICATES

2018 ◽  
Vol 59 (7) ◽  
pp. 35
Author(s):  
Konstantin L. Timofeev ◽  
Gennadiy I. Maltsev ◽  
Alexeiy V. Sviridov
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Selective Adsorption ◽  
Exchange Capacity ◽  
Static Exchange Capacity ◽  
Adsorption Processes ◽  
Iron And Zinc ◽  
Initial Content ◽  
Zinc Production ◽  
Modified Aluminosilicates

The aim of this work was to study the adsorption of indium from aqueous solutions on modified highly dispersed aluminosilicates for the recovery of indium from technological solutions. The adsorption isotherms of indium, iron and zinc from multi component solutions on modified by di(2-ethylhexyl) phosphoric acid montmorillonite were obtained. It was shown that adsorption processes can be reliably described by models of Langmuir and Freundlich (R2  =  0.96–0.99). The shape of the isotherms is determined both by the surface properties of the sorbent and forms of presence of metal ions in aqueous solutions. The highest value of Langmuir constant Kads = 422.65 for reagent "Metоsol" was obtained for ions of indium, which indicates the preferential affinity of the sorbing mineral to this element, since the corresponding figures for the ions Fe2+ (1.09) and Zn2+ (0.78) are close to unity. At sorption of metal ions from model solution in the range of acidity of 1-20 g/dm3 of H2SO4 the extraction of indium remains unchanged at ~70 %, and iron – is reduced from 39 to 15% of the initial content. With the further increase of acidity to 100 g/dm3 of H2SO4, the recovery of indium is reduced to 40 %; iron down to 14 %. In the examined range of concentration of sulfuric acid the extraction of zinc is from 6.0 to 7.5 percent. The value of the static exchange capacity for the studied metals are mmol/g: 0.39–0.23 of indium; 0.11–0.04 of iron(III); 0.05–0.04 of zinc. A rank of affinity of reagent "Metоsol" to extract the metal ions from solution with pre-reduced iron(III)  was In3+ > Fe2+ > Zn2+ which determines the feasibility of its use for the selective adsorption of indium from the complex composition of technological solutions of zinc production.

scholarly journals Sulfonated Magnetic Nanocomposite Based on Reactive PGMA-MAn Copolymer@Fe3O4 Nanoparticles: Effective Removal of Cu(II) Ions from Aqueous Solutions

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Reza Hasanzadeh ◽  
Peyman Najafi Moghadam ◽  
Naeimeh Bahri-Laleh ◽  
Ehsan Nazarzadeh Zare
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Metal Ion ◽  
Magnetic Nanocomposite ◽  
Ion Concentration ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Equilibrium Distribution Coefficient ◽  
Effective Removal ◽  
Maleic Anhydride Copolymer

Chelating magnetic nanocomposites have been considered as suitable materials for removal of heavy metal ions for water treatment. In this work poly(glycidyl methacrylate-maleic anhydride) copolymer (PGMA-MAn) is modified with 4-aminobenzenesulfonic acid (ABSAc) and subsequently the product reacted with modified Fe3O4 nanoparticles and 1,2-ethanedithiol (EDT) in the presence of ultrasonic irradiation for preparation of tridimensional chelating magnetic nanocomposite. Synthesized magnetic nanocomposite was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), vibrating sample magnetometer (VSM), energy dispersive X-ray analysis (EDX), elemental mapping analysis (EMA), Brunauer-Emmett-Teller (BET), and thermal gravimetric analysis (TGA). The adsorption behavior of Cu(II) ions was investigated by synthesized nanocomposite in various parameters such as pH, contact time, metal ion concentration, and adsorbent dosage. The equilibrium distribution coefficient (kd) was determined and the findings prove that the kd value is approximately high in the case of all selected metal ions. The synthesized nanocomposite exhibited good tendency for removing Cu(II) ions from aqueous solutions even at an acidic pH.

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