Recovery of uranium from seawater. 14. System arrangements for the recovery of uranium from seawater by spherical amidoxime chelating resins utilizing natural seawater motions

Egawa, Hiroaki; Kabay, Nalan; Shuto, Taketomi; Jyo, Akinori

doi:10.1021/ie00016a018

Cited by 14 publications

(8 citation statements)

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“…An extensive sorption study on polyamidoxime polymer obtained from the copolymer of acrylonitriledivinylbenzene was undertaken especially for extraction of uranyl ions from aqueous solutions by Egawa et al and Kabay et al 29,30 They found that the sorption capacity of uranyl ion was about 310 mg/g (the initial concentration of UO 2 2ϩ ion solution was 2700 ppm). Vernon and Shah prepared a chelating polymer bearing hydroxamic/amidoxime groups and the binding of copper and uranium was observed to be 165 and 214 mg/g, respectively.…”

Section: Resultsmentioning

confidence: 99%

Removal of concentrated heavy metal ions from aqueous solutions using polymers with enriched amidoxime groups

Kavaklı

Güven

2004

J of Applied Polymer Sci

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Particulate and fibrous adsorbents with enriched amidoxime groups were synthesized by using a novel monomer N,NЈ-dipropionitrile acrylamide. The adsorption properties of amidoximated poly(N,NЈ-dipropionitrile acrylamide) [poly(DPAAm)] particles and a nonwoven fabric grafted with the same for UO 2 2ϩ , Pb 2ϩ , Cu 2ϩ, and Co 2ϩ at high concentrations were investigated by batch process. Metal ion adsorption studies were conducted from metal ion solutions with different initial concentrations (100 -1500 ppm). It was shown that particulated amidoximated poly-(DPAAm) has higher adsorption capacity than amidoximated nonwoven fabrics for all metal ions, especially for uranyl ions. The results of the adsorption studies showed that the interaction between UO 2 2ϩ and amidoximated groups agree with the Langmuir-type isotherm. From the Langmuir equation, the adsorption capacities were found as 400 mg UO 2 2ϩ /g dry amidoximated poly(DPAAm) and 250 mg UO 2 2ϩ /g dry amidoximated graft polymer.

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Section: Resultsmentioning

confidence: 99%

Removal of concentrated heavy metal ions from aqueous solutions using polymers with enriched amidoxime groups

Kavaklı

Güven

2004

J of Applied Polymer Sci

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“…Development of amidoxime-based adsorbents for uranium recovery from seawater began in Japan during the early 1980s. These early studies led to a number of marine tests during the 1990s and early 2000s. − Marine testing of amidoxime materials during this period culminated in the work of Seko and co-workers, who were able to recover 1 kg of uranium, with a capacity of 2.85 mg/g of adsorbent, using a passive adsorbent system deployed for 240 days . In the United States, the US Department of Energy has sponsored research into the recovery of uranium from seawater since 2010 .…”

Section: Introductionmentioning

confidence: 99%

Uranium Recovery from Seawater Using Amidoxime-Based Braided Polymers Synthesized from Acrylic Fibers

Wiechert

Ladshaw

Kuo

et al. 2020

Ind. Eng. Chem. Res.

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Global demand for nuclear energy is expected to rise in the coming decades. To meet these growing needs, new uranium resources must be explored. One of the potential alternatives to traditional uranium mining is oceanic uranium. The capture and recovery of uranium from the ocean have been under investigation for some time, with many recent studies focused on amidoxime-based adsorbents. These adsorbents, while able to achieve high uranium recovery capacities, are, nevertheless, expensive to produce and adsorb a significant amount of hard-toremove vanadium. The purpose of this study is to evaluate the adsorption performance of amidoxime-based polymer braids synthesized from acrylic fibers that are designed to significantly cut polymer synthesis and conditioning costs. Adsorption experiments were performed in a mesoscale recirculating raceway flume system at environmental conditions, approximately 10.8 °C, with 40-μm prefiltered seawater over 28 days for small-and large-sized polymer braids. For both braid sizes, the adsorption of vanadium was far lower on the acrylic adsorbent considered in the present study than on previously tested adsorbents developed at Oak Ridge National Laboratory (ORNL AF1 and AI8). The small acrylic braids also outperformed both ORNL materials with respect to uranium adsorption under similar conditions. Adsorption modeling was used to simulate the performance at higher temperatures based on 20 °C experiments previously performed with these materials. Simulation results indicated that the small acrylic braids would have a somewhat less significant advantage with respect to uranium adsorption over both ORNL AF1 and AI8 at 20 °C and will continue to outperform both ORNL adsorbents at 31 °C. Vanadium adsorption on the small acrylic braids was less than onethird of the vanadium adsorption on either AF1 or AI8 for all temperatures. This behavior indicates that the newly developed acrylic adsorbents are able to achieve superior uranium adsorption compared to other amidoxime adsorbents previously developed while being cheaper to produce and adsorbing significantly less vanadium.

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“…Takeda used a fixed bed of hollow fibers containing amidoxime groups prepared via RIGP and obtained 0.97 mg U/g adsorbent after 30 days of contact with coastal seawater at an average superficial velocity of 4 cm/s [ 33 ]. Shortly thereafter, Egawa and coworkers examined the uptake of a high porosity amidoxime resin prepared from acrylonitrile-divinylbenzene copolymer beads, through various mooring and towing trials [ 34 ]. For both sets of trials, beds of amidoxime resin were suspended in the ocean from a buoy.…”

Section: Introductionmentioning

confidence: 99%

Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature

et al. 2017

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Recovering uranium from seawater has been the subject of many studies for decades, and has recently seen significant progress in materials development since the U.S. Department of Energy (DOE) has become involved. With DOE direction, the uranium uptake for amidoxime-based polymer adsorbents has more than tripled in capacity. In an effort to better understand how these new adsorbent materials behave under different environmental stimuli, several experimental and modeling based studies have been employed to investigate impacts of competing ions, salinity, pH, and other factors on uranium uptake. For this study, the effect of temperature and type of comonomer on uranium adsorption by three different amidoxime adsorbents (AF1, 38H, AI8) was examined. Experimental measurements of uranium uptake were taken in 1−L batch reactors from 10 to 40 °C. A chemisorption model was developed and applied in order to estimate unknown system parameters through optimization. Experimental results demonstrated that the overall uranium chemisorption process for all three materials is endothermic, which was also mirrored in the model results. Model simulations show very good agreement with the data and were able to predict the temperature effect on uranium adsorption as experimental conditions changed. This model may be used for predicting uranium uptake by other amidoxime materials.

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Recovery of uranium from seawater. 14. System arrangements for the recovery of uranium from seawater by spherical amidoxime chelating resins utilizing natural seawater motions

Cited by 14 publications

References 1 publication

Removal of concentrated heavy metal ions from aqueous solutions using polymers with enriched amidoxime groups

Removal of concentrated heavy metal ions from aqueous solutions using polymers with enriched amidoxime groups

Uranium Recovery from Seawater Using Amidoxime-Based Braided Polymers Synthesized from Acrylic Fibers

Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature

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