Dispersion-free solvent extraction of U(VI) in macro amount from nitric acid solutions using hollow fiber contactor

Gupta, Sonal; Rathore, N.S.; Sonawane, J. V.; Pabby, Anil Kumar; Janardan, P.; Changrani, R.D.; Dey, P. K.

doi:10.1016/j.memsci.2007.05.018

Cited by 33 publications

(11 citation statements)

References 16 publications

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“…Gupta et al 83 reported the applicability of non‐dispersive solvent extraction to the recovery of U(VI) from oxalate supernatant waste using TBP (tri‐n‐butylphosphate) and HNO 3 as extraction and back‐extraction agents respectively. The extraction reaction was considered instantaneous and described by the chemical equilibrium parameter and the mass transport was assumed to be controlled by diffusion through the liquid membrane.…”

Section: Mathematical Modelling Of Liquid Membrane Separation Processmentioning

confidence: 99%

An overview of the mathematical modelling of liquid membrane separation processes in hollow fibre contactors

Bringas

Román

Irabien

et al. 2009

J of Chemical Tech & Biotech

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Liquid membranes have traditionally been employed for liquid/liquid mass transfer and have found applications in industrial, biomedical and analytical fields as well as in hydrometallurgical processes, wastewater treatment and remediation of polluted groundwater. However, in spite of the known advantages of liquid membranes, there are few examples of industrial application. The development of reliable mathematical models and design parameters (mass transport coefficients and equilibrium or kinetic parameters associated with the interfacial reactions) is a necessary step for design, cost estimation, process optimisation and scale-up. This work reports an overview of the different approaches that have been proposed in the literature to the mathematical modelling of liquid membrane separation processes in hollow fibre contactors providing, at the same time, a useful guideline to characterise the mass transport phenomena and a tool for the optimal design and intensification of separation processes.

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Section: Mathematical Modelling Of Liquid Membrane Separation Processmentioning

confidence: 99%

An overview of the mathematical modelling of liquid membrane separation processes in hollow fibre contactors

Bringas

Román

Irabien

et al. 2009

J of Chemical Tech & Biotech

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“…They can be used for removal or recovery of metals from liquid wastes from industry and the separation of metallic contaminants from various kinds of wastewater [ 13 , 14 ]. They are also used in the extraction of radionuclides from the water streams [ 15 ]. In the present work membrane contactors have been applied to recover uranium from aqueous solutions at different steps of processing of uranium ores.…”

Section: Discussionmentioning

confidence: 99%

Liquid–liquid extraction of uranium(VI) in the system with a membrane contactor

Biełuszka

Zakrzewska

Chajduk

et al. 2013

J Radioanal Nucl Chem

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Raising role of the nuclear power industry, including governmental plans for the construction of first nuclear power plant in Poland, creates increasing demand for the uranium-based nuclear fuels. The project implemented by Institute of Nuclear Chemistry and Technology concerns the development of effective methods for uranium extraction from low-grade ores and phosphorites for production of yellow cake—U3O8. The Liqui-Cel® Extra-Flow 2.5 × 8 Membrane Contactor produced by CELGARD LLC (Charlotte, NC) company is the main component of the installation for liquid–liquid extraction applied for processing of post leaching liquors. In the process of membrane extraction the uranyl ions from aqueous phase are transported through the membrane into organic phase. The flow of two phases in the system was arranged in co-current mode. The very important element of the work was a selection of extracting agents appropriate for the membrane process. After preliminary experiments comprising tests of membrane resistivity and determination of extraction efficiency, di(2-ethylhexyl)phosphoric acid was found to be most favourable. An important aspect of the work was the adjustment of hydrodynamic conditions in the capillary module. To avoid the membrane wettability by organic solvent and mixing two phases equal pressure drops along the membrane module to minimize the transmembrane pressure, were assumed. Determination of pressure drop along the module was conducted using Bernoulli equation. The integrated process of extraction/re-extraction conducted in continuous mode with application of two contactors was designed.

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“…Different techniques used for the removal of toxic metal ions from contaminated wastewater are filtration [20], chemical precipitation [21], chemical coagulation [22], flocculation [23], reverse osmosis [24], solvent extraction [25], membrane separation [26][27][28], ion exchange [29], and adsorption. The efficiency of most of these methods was found to be less due to less removal of heavy metals at very low concentrations, high operational cost, and contamination of recipient environment by their secondary effluent impact [30][31][32][33].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Nanomagnetite-loaded poly (acrylamide-co-itaconic acid) hydrogel as adsorbent for effective removal of Mn2+ from contaminated water

Sharma

Tiwari

2016

Desalination and Water Treatment

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A B S T R A C TThe present research focuses on the adsorptive efficiency of nanomagnetite-loaded poly (acrylamide-co-itaconic acid) hydrogel for manganese removal from aqueous and contaminated solution by batch as well as column adsorption technique. The influence of pH, contact time, adsorbent dose, temperature, metal ion concentration, bed depth, feed flow rate and inlet metal ion concentration on the sensitivity of the removal process was inspected. The copolymer was synthesized and magnetized in situ. The sorption data was analyzed and fitted to linearized adsorption isotherm of the Langmuir and Freundlich equations, respectively. Equilibrium data fitted very well to the Freundlich model. The kinetics of sorption was analyzed using pseudo-first-order and pseudo-second-order kinetic models. Kinetic parameters, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were calculated. Different thermodynamic parameters i.e. ΔG 0 , ΔH 0 , and ΔS 0 were also evaluated which proved the sorption to be feasible, spontaneous, and exothermic in nature. This hydrogel has been found to be an efficient adsorbent for manganese removal from water (>99% removal) and could be regenerated efficiently for further experiments.

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Dispersion-free solvent extraction of U(VI) in macro amount from nitric acid solutions using hollow fiber contactor

Cited by 33 publications

References 16 publications

An overview of the mathematical modelling of liquid membrane separation processes in hollow fibre contactors

An overview of the mathematical modelling of liquid membrane separation processes in hollow fibre contactors

Liquid–liquid extraction of uranium(VI) in the system with a membrane contactor

Nanomagnetite-loaded poly (acrylamide-co-itaconic acid) hydrogel as adsorbent for effective removal of Mn2+ from contaminated water

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