Optimization of adsorption parameters for removal of 152+154Eu(III) from aqueous solutions by using Zn-Cu-Ni ternary mixed oxide

Mahmoud, Mamdoh R.; Rashad, Ghada M.; Elewa, Ahmed M.; Metwally, Essam; Saad, E. A.

doi:10.1016/j.molliq.2019.111257

Cited by 15 publications

(11 citation statements)

References 49 publications

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“…In order to estimate the values of enthalpy change (ΔH o ), entropy change (ΔS o ) and free energy change (ΔG o ), adsorption processes of cobalt and manganese were calculated at different temperatures (25, 35, 45 and 60°C). These parameters are calculated by the following relations [36]:…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Efficient removal of radiocobalt and manganese from their binary aqueous solutions by batch adsorption process using PAN/HDTMA/KCuHCF composite

et al. 2020

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Simultaneous removal of radiocobalt and manganese by adsorption onto polyacrylonitrile/hexadecyltrimethylammonium bromide/potassium copper hexacyanoferrate (PAN/HDTMA/KCuHCF) composite was studied. The synthesized composite was characterized by Fourier-transformed infrared (FT-IR), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). The influence of the solution pH was studied in the range 1.5–7.8 and the results showed the effectiveness of the synthesized composite for simultaneous adsorption of radiocobalt and manganese in the pH range 2.5–6 at an adsorbent mass of 4 g/L. Adsorption kinetic data of manganese at the studied concentrations were best fitted by pseudo-second-order kinetic model and the diffusion study showed that the adsorption process was controlled by film diffusion. Thermodynamic parameters (ΔGo, ΔHo and ΔSo) were estimated and the results indicated that adsorption processes of the concerned (radio)toxicants were spontaneous and endothermic in nature. Of the studied isotherm models, Freundlich and Langmuir were the best ones for describing the adsorption isotherm data of radiocobalt and manganese, respectively. The adsorption capacity of PAN/HDTMA/KCuHCF was found to be 23.629 (for radiocobalt) and 62.854 (for manganese). Desorption of Radiocobalt and manganese loaded onto PAN/HDTMA/KCuHCF composite was studied using various desorbing agents at different concentrations.

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Section: Thermodynamic Studiesmentioning

confidence: 99%

Efficient removal of radiocobalt and manganese from their binary aqueous solutions by batch adsorption process using PAN/HDTMA/KCuHCF composite

et al. 2020

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“…By increasing the mass of CTABzeolite from 1 to 10 g/L, the adsorbed amount of Cs + is reduced from 0.18 to 0.02 mmol/g while that of HCrO 4 − is reduced from 0.36 to 0.04 mmol/g. This reduction in the adsorbed amounts is attributed to (i) the decrease of CTABzeolite surface area and the increase of the diffusion path length owing to particle aggregation (Hamoud et al 2021;Mahmoud et al 2019;Chen et al 2012), and (ii) the utilization of unsaturated adsorption sites, of the extra CTABzeolite particles, which is accounted during estimating the adsorbed amounts of the studied (radio)toxicants (Mahmoud et al 2019;Xing et al 2011). During the calculation of the adsorbed amounts of Cs + and HCrO 4 − ions using Eq.…”

Section: Effect Of Ctab-zeolite Massmentioning

confidence: 99%

“…12). Non-linear equations of these models are expressed as (Mahmoud et al 2014(Mahmoud et al , 2019Ho and McKay 1999;Weber and Morris 1963;Lagergren 1898):…”

Section: Effect Of Contact Time and Modeling Of Datamentioning

confidence: 99%

“…For Elovich kinetic model, α is the initial adsorption rate (mmol/g min) and β is the desorption constant (g/mmol) and it is related to the surface coverage and activation energy of chemical adsorption (Mahmoud et al 2014). For intraparticle diffusion to be the rate-controlling step, the value of the non-dimensional coefficient, m, should be equal 0.5 (Mahmoud et al 2019). Non-linear fittings of the kinetic data of the studied (radio)toxicants to the abovementioned kinetic models are shown in Fig.…”

Section: Effect Of Contact Time and Modeling Of Datamentioning

confidence: 99%

“…15), and Redlich-Peterson (Eq. 16), which are represented by the following equations (Mahmoud et al 2019;Temkin and Pyzhev 1940;Langmuir 1918;Freundlich 1906):…”

Section: Adsorption Isotherms and Modeling Of Datamentioning

confidence: 99%

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Efficient adsorption of cesium cations and chromate anions by one-step process using surfactant-modified zeolite

Hamoud

Abo-Zahra

Attia

et al. 2023

Environ Sci Pollut Res

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Natural zeolite is organically modified with the surfactant cetyltrimethylammonium bromide (CTAB) and employed as a dual-function material for simultaneous adsorption of Cs+ cations and HCrO4− anions from aqueous solutions. Unmodified and modified zeolites are characterized by Fourier transform infrared (FTIR), dynamic light scattering (DLS), nitrogen adsorption–desorption isotherms, and X-ray diffraction (XRD). The results showed that CTAB-zeolite had the efficiency to simultaneously adsorb the concerned species in the pH range 2.5–4.2. The kinetic data showed that 90 and 300 min for Cs(I) and Cr(VI), respectively, were sufficient to attain equilibrium and the data are well-fitted by the double-exponential kinetic model. Of the studied adsorption isotherm models, Redlich-Peterson was the best one for describing the equilibrium adsorption isotherms. Values of ∆H°, ∆S°, and ∆G° for the present adsorption processes are estimated. CTAB-zeolite exhibited adsorption capacities of 0.713 and 1.216 mmol/g for Cs(I) and Cr(VI), respectively, which are comparable with the data reported in the literature. The adsorption mechanism of the concerned (radio)toxicants is proposed.

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Adsorption of 60Co and 154+152Eu Using Graft Copolymer of Starch-Polyacrylic Acid-Polyvinylsulfonic Acid

Ghamry

Abdelmonem

2022

J Polym Environ

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Starch-polyacrylic acid-polyvinylsulfonic acid (St-g-PAA-PVSA) graft copoymer was synthesized by gamma radiation as an initiator. The chemical structure, morphology, and thermal stability of the graft copolymer were investigated using FTIR, SEM, and TGA. The St-g-PAA-PVSA graft copolymer was employed as an adsorbent for the removal of Co(II) and Eu(III) radionuclides from their aqueous solutions by batch adsorption method. Several experimental factors such as pH, contact time, initial concentration of adsorbate, and temperature were used to find the best conditions for the removal of Co(II) and Eu(III) radionuclides. The pseudo-second order kinetic model better fits the adsorption kinetic data of radionuclides. Langmuir models had the ability to well describe the equilibrium data of adsorption of radionuclides. Thermodynamic parameters were calculated and suggested the adsorption process of Co(II) was endothermic while exothermic in the case of Eu(III) adsorption and both adsorption systems were spontaneous in nature. Among the examined desorbing agents, both AlCl3 and HCl were succeeded to desorb most of the radionuclides.

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Optimization of adsorption parameters for removal of 152+154Eu(III) from aqueous solutions by using Zn-Cu-Ni ternary mixed oxide

Cited by 15 publications

References 49 publications

Efficient removal of radiocobalt and manganese from their binary aqueous solutions by batch adsorption process using PAN/HDTMA/KCuHCF composite

Efficient removal of radiocobalt and manganese from their binary aqueous solutions by batch adsorption process using PAN/HDTMA/KCuHCF composite

Efficient adsorption of cesium cations and chromate anions by one-step process using surfactant-modified zeolite

Adsorption of 60Co and 154+152Eu Using Graft Copolymer of Starch-Polyacrylic Acid-Polyvinylsulfonic Acid

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