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Journal ArticleDOI: 10.1080/01496395.2018.1563614

Adsorption and separation of terbium(III) and gadolinium(III) from aqueous nitrate medium using solid extractant

04 Mar 2021-Separation Science and Technology (Taylor & Francis)-Vol. 56, Iss: 4, pp 681-693
Abstract: A macroporous copolymer of styrene and divinylbenzene resin (TVEX-PHOR) was examined for adsorption of terbium(III) and gadolinium(III) from nitrate medium. Characterization of TVEX-PHOR before and...

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Topics: Divinylbenzene (59%), Terbium (54%), Styrene (53%) ... read more

12 results found

Journal ArticleDOI: 10.1016/J.MOLLIQ.2020.112760
Abstract: This study aims to research the adsorption of Nd+3, Tb+3, and Dy+3 from aqueous media onto the magnetic calcium alginate/carboxymethyl chitosan/Ni0.2Zn0.2Fe2.6O4 (CA/CMC/Ni0.2Zn0.2Fe2.6O4) bionanocomposite in a single system. FE-SEM, FT-IR, EDX, VSM, and TGA were applied to characterize the product. The VSM result showed the saturation magnetization values of 45.87 and 14.14 emu/g for the bare Ni0.2Zn0.2Fe2.6O4 nanoparticles and CA/CMC/Ni0.2Zn0.2Fe2.6O4, respectively. The adsorption results showed that at optimum conditions of contact time of 40 min, pH of 5.5, and 0.8 g/L, the adsorption efficiency of the adsorbent for Nd+3, Tb+3, and Dy+3 was 97.75, 96.83, and 97.85%, respectively. The ions adsorption kinetic onto the CA/CMC/Ni0.2Zn0.2Fe2.6O4 was in accordance with pseudo-second-order (PSO) model. The evaluation of equilibrium data was performed by the isotherm models of Langmuir and Freundlich. Fitting the experimental data of Tb+3 and Dy+3 was done better with Freunlich model than Langmuir model, while fitting tests for Nd+3 adsorption data showed better coverage using Langmuir model with a maximum adsorption capacity of 73.37 mg/g. The results of the parameters of thermodynamic showed the endothermic and spontaneous properties of the process. Additionally, the efficacy of the adsorbent was studied using 0.2 M HNO3 in four adsorptions–desorption cycles. Overall, the obtained results demonstrated that the environmentally friendly magnetic bionanocomposite adsorbent can be applied effectively for Nd+3, Tb+3, and Dy+3 adsorption with favorable adsorption efficiency.

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Topics: Freundlich equation (60%), Adsorption (57%), Langmuir adsorption model (57%) ... read more

19 Citations

Journal ArticleDOI: 10.1016/J.MOLLIQ.2020.113017
Abstract: In this research study, the carboxymethyl chitosan/poly(pyrimidine-thiophene-amide)/Ni0.2Zn0.2Fe2.6O4 (CMC/P(PTA)/Ni0.2Zn0.2Fe2.6O4) was prepared as a novel magnetic bionanocomposite adsorbent. FE-SEM, EDX, NMR, XRD, FT-IR, and VSM techniques were applied for the analyses of the products. The adsorption behavior of the prepared bionanocomposite was investigated towards Nd+3, Tb+3, and Dy+3 as adsorbates. The adsorption process was evaluated considering the influence of independent parameters including pH of the solution, contact time, adsorbent dosage, initial metal ions concentration, and ionic strength. The adsorption efficiency values of 98.15, 97.6, and 99.42% were respectively obtained for Nd+3, Tb+3, and Dy+3 at optimum conditions of pH = 5.5, 30 mg/L of the ions, adsorbent dosage of 0.06 g, and contact time of 90 min. The data of the adsorption equilibrium of the ions were fitted well by Freundlich model. Kinetic studies showed that Nd+3, Tb+3, and Dy+3 adsorption followed both pseudo-second-order (PSO) and intra-particle diffusion (IPD) kinetic models. The values of ΔH° indicated that the ions adsorption process onto the bionanocomposite was endothermic, and the ΔG° values revealed that it was spontaneous at higher temperature. The CMC/P(PTA)/Ni0.2Zn0.2Fe2.6O4 could be regenerated by 0.2 M HNO3 and its separation was viable utilizing a magnetic field with the saturation magnetization value of 14.88 emu/g.

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14 Citations

Journal ArticleDOI: 10.1016/J.COLSURFA.2020.125252
Abstract: In this paper, a novel polyamide containing pyrimidine and methine thiophene linkages (poly(pyrimidine-thiophene-amide) (P(P-T-A))) was synthesized. Then, the magnetic calcium alginate nanocomposite containing P(P-T-A) (CA-P(P-T-A)-Ni0.2Zn0.2Fe2.6O4 (NZFO)) was synthesized for studying neodymium (Nd+3), terbium (Tb+3), and dysprosium (Dy+3) ions adsorption in the single ion solutions. The obtained results of X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), energy-dispersive X-ray (EDX), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and Fourier transform infrared (FT-IR) indicated the successful synthesis of the materials. The value of saturation magnetization of the nanocomposite was reported to be 15.28 emu/g, indicating an appropriate magnetic response. Under the optimum conditions, adsorption efficiency for Nd+3, Tb+3, and Dy+3 was 96.73, 94.82, and 97.58 %, respectively. According to the experimental results, it can be stated that the data of REEs adsorption were efficiently fitted by nonlinear pseudo-second-order kinetic model. Adsorption isotherms were also evaluated by fitting with Freundlich and Langmuir isotherm models. A better fit was achieved by Freundlich model in the case of Tb+3 and Dy+3 ions, while Langmuir isotherm fitting reported a better result for Nd+3 adsorption data. Moreover, the changes in Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) values presented a feasible and endothermic ions adsorption process onto the nanocomposite that occurred spontaneously under the investigated conditions. The obtained results indicated that the nanocomposite can be considered as a potential adsorbent for the efficient adsorption of the investigated ions.

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Topics: Freundlich equation (62%), Adsorption (57%), Langmuir adsorption model (55%) ... read more

10 Citations

Journal ArticleDOI: 10.1016/J.JALLCOM.2019.152041
Abstract: Magnetite nanoparticles were synthesized by reverse co-precipitation method using iron salts in alkaline medium, in presence of ethylene glycol (EG) or diethylene glycol (DEG) as polyol solvents. The morphology and magnetic properties of pure magnetite and modified magnetite were characterized by different techniques. X-ray diffraction (XRD) studies support the presence of a highly crystalline Fe3O4 phase and the coating of DEG or EG did not affect the composition of magnetite. Transmission electron microscopy (TEM) image showed that the shape of Fe3O4, DEG coated particles and EG coated particles were spherical with a nano size of mean diameter 18.8, 14.45 and 10.49 nm, respectively. The usability of EG-coated magnetite for the sorption of Pd(II) from aqueous chloride solution was investigated by batch experiments. Parameters affecting the uptake of palladium metal ion were studied. The kinetic studies and the isotherm data were described using different models. Experimental data showed that the sorption process could be quite fitted with pseudo-second order kinetic and Langmuir models. In addition, thermodynamic parameters were evaluated to expect the nature of sorption. Further, the desorption of Pd(II) from EG/MNPs was achieved using 5.0 mol/L HNO3 solution, and the nano-magnetite was reused effectively. Finally, the separation possibility of palladium from some fission products was achieved successfully.

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Topics: Sorption (57%), Desorption (55%), Magnetite (55%) ... read more

8 Citations

Journal ArticleDOI: 10.1016/J.JALLCOM.2020.157039
R. Gamal1, S.E. Rizk1, N.E. El-Hefny1Institutions (1)
Abstract: A magnetic chromium ferrite (CrFe2O4) nanocomposite was prepared through the sonochemical method in the presence of oleic acid as a nonionic surfactant. The produced powder was further characterized using energy dispersive spectroscopy (EDX), X-ray diffraction (XRD), a vibrating sample magnetometer (VSM) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. SEM and TEM images showed the surface morphology and formation of nanosized particles. The removal of molybdenum (VI) from fission products was studied using a magnetic CrFe2O4 nanoadsorbent by the batch adsorption technique. The point of zero charge, pHPZC, of the magnetic ferrite was determined by the solid addition method. Adsorption was successfully described using a pseudo-second-order model. The Langmuir and Toth models were capable of perfectly fitting the equilibrium data. Additionally, the thermodynamic parameters were obtained. The desorption amount of molybdenum ions reached the maximum value (exceeding 99%) when using 1.0 mol/L NaOH. These results suggested that the magnetic CrFe2O4 nanoadsorbent was an adsorbent that could be potentially used for the successful removal of molybdenum (VI) from a mixture of metal ions found in fission products.

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Topics: Adsorption (53%), Fourier transform infrared spectroscopy (53%), Point of zero charge (53%) ... read more

6 Citations


36 results found

Journal ArticleDOI: 10.1016/S0143-7208(01)00056-0
01 Oct 2001-Dyes and Pigments
Abstract: The kinetics and mechanism of methylene blue adsorption on commercial activated carbon (CAC) and indigenously prepared activated carbons from bamboo dust, coconut shell, groundnut shell, rice husk, and straw, have been studied. The effects of various experimental parameters have been investigated using a batch adsorption technique to obtain information on treating effluents from the dye industry. The extent of dye removal increased with decrease in the initial concentration of the dye and particle size of the adsorbent and also increased with increase in contact time, amount of adsorbent used and the initial pH of the solution. Adsorption data were modeled using the Freundlich and Langmuir adsorption isotherms and first order kinetic equations. The kinetics of adsorption were found to be first order with regard to intra-particle diffusion rate. The adsorption capacities of indigenous activated carbons have been compared with that of the commercial activated carbon. The results indicate that such carbons could be employed as low cost alternatives to commercial activated carbon in wastewater treatment for the removal of colour and dyes.

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Topics: Freundlich equation (64%), Adsorption (63%), Activated carbon (60%) ... read more

1,626 Citations

Journal ArticleDOI: 10.1016/J.JCIS.2005.05.087
Abstract: Adsorption of Cu(II) from aqueous solution onto H(3)PO(4)-activated carbon using rubber wood sawdust (RSAC) was investigated in a batch system. Kinetic and isotherm studies were carried out by considering the effects of various parameters, such as initial concentration, contact time, pH, and temperature. The optimal pH value for Cu(II) adsorption onto RSAC was found to be 6.0. Thermodynamic parameters such as standard Gibbs free energy (DeltaG(0)), standard enthalpy (DeltaH(0)), and standard entropy (DeltaS(0)) were evaluated by applying the Van't Hoff equation. The thermodynamics of Cu(II) adsorption onto RSAC indicates its spontaneous and exothermic nature. Langmuir, Freundlich, and Temkin isotherms were used to analyze the equilibrium data at different temperatures. The Langmuir isotherm fits the experimental data significantly better than the other isotherms. Adsorption kinetics data were tested using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. Kinetic studies showed that the adsorption followed a pseudo-second-order reaction. The initial sorption rate, pseudo-first-order, pseudo-second-order, and intraparticle diffusion rate constants for different initial concentrations were evaluated and discussed. Adsorption mechanism studies revealed that the process was complex and followed both surface adsorption and particle diffusion. The rate-controlling parameter and effective diffusion coefficient were determined using the Reichenberg plot. It was found that the adsorption occurs through film diffusion at low concentrations and at higher concentration the particle diffusion becomes the rate-determining step.

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Topics: Freundlich equation (65%), Adsorption (60%), Langmuir (57%) ... read more

502 Citations

Journal ArticleDOI: 10.1016/J.DESAL.2007.01.206
01 Mar 2008-Desalination
Abstract: The effective removal of heavy metals from aqueous wastes is among the most important issues for many industrialized countries. Removal of lead (II) and copper (II) from aqueous solutions were studied using pomegranate peel (raw), activated carbon prepared from pomegranate peel (AC1) and activated carbon prepared from chemically treated pomegranate peel (AC2 and AC3). Batch adsorption experiments were performed as a function of pH, contact time, solute concentration and adsorbent dose. The optimum pH required for maximum adsorption were found to be 5.6 and 5.8, for lead and copper respectively. The experimental equilibrium adsorption data are tested for the Langmuir, Freundlich and Temkin equations. Results indicate the following order to fit the isotherms: Langmuir > Temkin > Freundlich in case of lead ions and Freundlich > Temkin > Langmuir in case of copper ions. Adsorption kinetics data were modeled using the pseudo-first and pseudo-second order, Elvoich equations and intraparticle diffusion models. The results indicate that the second-order model best describes adsorption kinetic data.

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Topics: Freundlich equation (67%), Langmuir (57%), Adsorption (56%) ... read more

454 Citations

Journal ArticleDOI: 10.1016/J.MOLLIQ.2016.06.076
Abstract: Rare earth elements (REEs) have gained considerable attention due to their unique properties and their use in huge range of industrial applications. They are widely used in different sectors such as, nuclear energy, metallurgy, medicine, chemical engineering, electronics, and computer manufacturing. As a result, the recovery of REEs is a significant issue that needs appropriate attention. There are many methods to recover REEs such as precipitation, filtration, solvent extraction etc. but these methods are not economically attractive. Among the available methods, adsorption has gained wider attention because of its simplicity, high efficiency and low cost. This review article presents the recently published literature (after 2013) regarding the removal of rare earth metals from aqueous solution by different low cost adsorbents. For this purpose, best applying model (isotherm, kinetic), thermodynamic studies and other factors which influence the adsorption process (such as the effect of solution pH, contact time, temperature and adsorbent's dose) are also discussed.

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193 Citations

Journal ArticleDOI: 10.1016/J.REACTFUNCTPOLYM.2010.01.005
Abstract: Interest in the development of solvent-impregnated resins (SIRs) and their applications for the separation of metal ions and organic compounds from water in the form of a hybrid polymeric adsorbent material has intensified over the past thirty years. SIRs are particulate adsorbers that possess a combination of the advantageous features of both liquid–liquid extraction and ion exchange and this renders them applicable to a wide range of potential liquid–solid separation and recovery processes. This paper reviews the extensive published literature on methods of synthesis of SIRs, attempts to stabilize hybrid solvent-impregnated resins and various applications of SIRs.

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137 Citations