Wang et al. synthesized α–MnO 2 @polydopamine nanocomposites (α–MnO 2 @PDAs) by coating α–MnO 2 nanowires with polydopamine for U(VI) removal from solution. [19]. [19]. Despite its benefits, nanosized MnO 2 –based particles are easy to agglomerate in the process of adsorption due to high surface energy [20].
Orange peel is an important resource in view of its low-cost and universal nature. A novel material (MnO 2 /orange peel carbon, MnO 2 /OPC) was yielded via a single step involving activation and in situ deposit. The feasibility of uranium removal using MnO 2 /OPC was tested by varying MnO 2 loading amount, pH, ionic strength, …
Ion exchange has traditionally been employed for the purification of water and the removal of metal contaminants from dilute waste streams. More recently, its use in removing trace metallic impurities from hydrometallurgical process streams (with typical background metal concentrations of 50–100 g/L) has increased substantially.
The presented studies deal with an assessment of the possibility of uranium recovery from the low-grade uranium resources in Poland. Uranium was leached from the ground uranium ores with efficiencies in 81– range that depend on the type of ore and leaching solution used. In the next step, the post-leaching solution was treated by …
These characteristics made BCL/PPy-3 competitive for enhanced hexavalent uranium ion electrosorption. These features were highly conducive to fast electron transfer and better diffusion of hexavalent uranium ions during the CDI process. The exposed S atoms in BCL/PPy-3 showed good coordination and complexing power for hexavalent …
Uranium removal strategies primarily involve adsorption [7], chemical precipitation [20], ion exchange [21,22], membrane filtration [22,23], photocatalysis [24–28], and …
A new processing scheme was developed using an anion exchange column run in a cycling mode with HNO3 media as the primary uranium purification process. …
The ion exchange mechanism for metal removals can be explained in the following reaction as the ion exchange particle having ion exchanger of M − EC + (M − is the fixed anion and EC + is the ...
Mine waters from gold and sometimes coal mining contain low but potentially harmful levels of uranium. These are not easily removed by conventional treatment technologies such as lime precipitation. The use of ion exchange resins for the recovery of uranium from water sources in especially mine water circuits is commonplace and can be considered to be …
The use of ion exchange resins for the recovery of uranium from water sources in especially mine water circuits is commonplace and can be considered to be state-of-the …
The chloride (Cl) ion of the salt molecule is utilized by the anion exchange site, the sodium (Na) ion passes right through the resin bed and does not affect the process. Operational Guidelines The anion …
Request PDF | Elimination of radionuclide uranium (VI) from aqueous solutions using an α-MnO@CTS composite adsorbent | To effectively treat the contamination caused by radionuclide uranium (VI ...
Attention is paid mainly to ion exchange using different states of oxidation of uranium in aqueous and organic solutions. The bibliography contains 70 references. Read more
Ion exchange (IX) is an attractive approach to extract uranium from wastewater, simultaneously reducing the negative environmental impact of uranium …
Several novel processes have been developed for the recovery of uranium from wet-process phosphoric acid. Experimental measurements have been made on the batch extraction of uranium from phosphoric acid solutions using various chelating ion-exchange resins (RSPO, Diaion-CRP200, Diphonix, Purolite S940, Duolite ES467, and …
1. Introduction. Nuclear power with low-carbon, is an important tool to address the challenges of climate change and atmospheric environmental pollution, contributing about 14% of total electricity in the world in 2022 (WNA, 2022).Uranium (U), as a representative actinide element, is an extremely vital nuclear fuel applied in nuclear …
The order of U(VI) removal in the UV/FA process was as follows: FA (HCOOH) > CA > L-TA > D-TA > AA > MA. ... membranes for uranium removal from aqueous solution. Prog Nucl Energy 94:93–100. Article CAS Google Scholar Reinoso-Maset E, Ly J (2016) Study of uranium(VI) and radium(II) sorption at trace level on …
Therefore, the separation of U(VI) ions from aqueous solutions using ion-exchange resins is an active research topic, and results related to removing U(VI) from mining-process waters (Amphlett et ...
The use of ion exchange resins for the recovery of uranium from water sources in especially mine water circuits is commonplace and can be considered to be state-of-the …
The results reveal that the ion exchange process of ion exchange fibers is monolayer adsorption. In the Freundlich model, when the adsorption process was difficult, the equilibrium constant n is smaller than 0.5, and when the adsorption was easy to perform, the constant n was in the range of 2–10 . The result, that equilibrium constant …
Lithium recovery from desalination brines using specific ion-exchange resins. ... Separation and recovery of lithium from geothermal water by sequential adsorption process with λ-MnO 2 and TiO2. Ion Exch. Lett., 5 (2012), ... Removal of lignin and tannin colour from aqueous solution by adsorption onto activated charcoal.
The feasibility of employing ion-exchange resins for the selective removal of uranium from a complex waste effluent has been investigated. The source of the effluent is a treatment process to reduce the volume of a spent uranium containing catalyst prior to its immobilisation and disposal in South Korea.
Uranium redox chromatographies were carried out in order to study uranium isotope separation based on chemical process. Hexavalent uranium ions were first adsorbed in the anion-exchange resin ...
The BDST model was used to study the influence of bed height on the adsorption of uranium (VI). Desorption of uranium (VI) in the MOCZ column was …
For this reason, uranium must be extracted from the copper PLS using anion-exchange resins. The ion-exchange process used to extract uranium from the leaching solution was based on the high binding of the sulphate anion complexes to uranium, to the anion-exchange resin (Rosenberg et al., 2016). The ion-exchange …
AbstractIn this study, an amidoximated chelating ion-exchange resin was prepared using poly-acrylonitrile grafted potato starch. The resin characterizations such as specific surface area, pore volume, average pore radius, and Fourier transform infrared spectroscopy of the resin were defined. The effects of pH, contact time, adsorbent …
The column could be used for at least four adsorption-desorption cycles using 0.1 mol·L −1 NaHCO 3 solution as the elution. After desorption and regeneration with deionized water, MOCZ could be reused to adsorb uranium (VI) at a comparable capacity. Compared to raw zeolite, MOCZ showed better capacity for uranium (VI) removal.
Uranium leaching is the process by which the uranium is extracted from the raw ore by reacting the material with acid or base. Fig. 2 shows a general process flow for the uranium extraction process. Prior to the …
In the ion exchange process, ion exchange between two phases occurs. When a resin (a cross-linked polymer network consisting of electrostatically bound ions) meets a workable alternative metallic compounds of the same charge, ion exchange may occur, the extent of which can be determined by the ion concentration in the solution.