A half-wave rectified alternating current electrochemical method for uranium extraction from seawater

Liu, Chong; Hsu, Po‐Chun; Xie, Jin; Zhao, Jie; Wu, Tong; Wang, Haotian; Liu, Wei; Zhang, Jinsong; Chu, Steven; Cui, Yi

doi:10.1038/nenergy.2017.7

Cited by 423 publications

(210 citation statements)

References 37 publications

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“…[1] Until now, nuclear power remains the only mature technology that can continuously provide seen significant progress since the US Department of Energy (DOE) has become involved. [27] The HW-ACE method achieved an extraordinary high uranium extraction capacity (1932 mg-U per g-Ads) without saturation and obviously faster kinetics than conventional physicochemical methods using uranium-spiked seawater. [19][20][21][22][23][24][25][26][27] Very recently, Cui and co-workers reported the application of an amidoxime-functionalized electrode in a half-wave rectified alternating current electrochemical (HW-ACE) method for the extraction of uranium from seawater.…”

Section: Introductionmentioning

confidence: 96%

“…Great efforts have been made to develop clean energy as alternatives to fossil fuels. [19][20][21][22][23][24][25][26][27] Very recently, Cui and co-workers reported the application of an amidoxime-functionalized electrode in a half-wave rectified alternating current electrochemical (HW-ACE) method for the extraction of uranium from seawater. [3] With DOE direction, the uranium uptake capacity of fiber adsorbents in natural seawater has more than tripled in five years.…”

Section: Introductionmentioning

confidence: 99%

“…[3,[26][27][28][29][30] Radiation-induced graft polymerization (RIGP) and atom-transfer radical polymerization (ATRP) strategies were commonly used to graft acrylonitrile monomer to some robust backbone polymer fibers, typically polyethylene (PE) fibers, to form polyacrylonitrile (PAN) grafted fabric, followed with the postamidoximation to convert nitrile groups to amidoxime groups. [3,[26][27][28][29][30] Radiation-induced graft polymerization (RIGP) and atom-transfer radical polymerization (ATRP) strategies were commonly used to graft acrylonitrile monomer to some robust backbone polymer fibers, typically polyethylene (PE) fibers, to form polyacrylonitrile (PAN) grafted fabric, followed with the postamidoximation to convert nitrile groups to amidoxime groups.…”

Section: Introductionmentioning

confidence: 99%

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Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent

Wang

Song

Wen

et al. 2018

Advanced Energy Materials

230

163

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electricity on a large scale with ultralow greenhouse gases emission. [2] Uranium is the most critical ingredient for the production of nuclear power. In order for nuclear power to be a sustainable energy generation in the future, economically viable sources of uranium beyond terrestrial ores must be developed. [3] The oceans hold ≈4.5 billion tons of uranium, [4] making them a potential huge resource to support nuclear power production for hundreds of years. [5] All that is required is the ability to capture this element from seawater in cost-and energy-efficient ways. In the last decades, researchers worldwide have tried various methods to recover uranium from seawater and aqueous solution, such as coprecipitation, [6] ion-exchange, [7] adsorption via porous organic polymers, [8,9] and organic-inorganic hybrid adsorbents. [10][11][12][13][14][15][16] Among these technologies, the adsorption approach, particularly by using fiber-based adsorbents, is recognized as the most feasible process in terms of practicality, processability, cost, and environmental concerns. [3,17] In the 1990s, Japan Atomic Energy Agency (JAEA) research teams had successfully captured over 1083 g of uranium directly from ocean by using nonwoven fabric adsorbent, firmly establishing the practicality of uranium recovery from the oceans in appreciable quantities. [3,18] Uranium extraction from seawater via fiber adsorption has recentlyThe oceans contain hundreds of times more uranium than terrestrial ores. Fiber-based adsorption is considered to be the most promising method to realize the industrialization of uranium extraction from seawater. In this work, a pre-amidoximation with a blow spinning strategy is developed for mass production of poly(imide dioxime) nanofiber (PIDO NF) adsorbents with many chelating sites, excellent hydrophilicity, 3D porous architecture, and good mechanical properties. The structural evidences from 13 C NMR spectra confirm that the main functional group responsible for the uranyl binding is not "amidoxime" but cyclic "imidedioxime." The uranium adsorption capacity of the PIDO NF adsorbent reaches 951 mg-U per g-Ads in uranium (8 ppm) spiked natural seawater. An average adsorption capacity of 8.7 mg-U per g-Ads is obtained after 56 d of exposure in natural seawater via a flowthrough column system. Moreover, up to 98.5% of the adsorbed uranium can be rapidly eluted out and the adsorbent can be regenerated and reused for over eight cycles of adsorption-desorption. This new blow spun PIDO nanofabric shows great potential as a new generation adsorbent for uranium extraction from seawater.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent

Wang

Song

Wen

et al. 2018

Advanced Energy Materials

230

163

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“…Although the amount of uranium in seawater is massive, it is highly challenging to extract it efficiently due to its low concentration (≈3.3 ppb) as well as the high ionic strength and competing metal ions in seawater . An ideal adsorbent should have as many active chelating sites as possible, while at the same time possess enough mechanical strength to withstand the harsh conditions of the ocean environment for practical applications.…”

Section: Introductionmentioning

confidence: 99%

A Marine‐Inspired Hybrid Sponge for Highly Efficient Uranium Extraction from Seawater

Wang

Song

Lin

et al. 2019

Adv Funct Materials

128

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Marine sponges are used as biomonitors of heavy metals contamination in coastal environment as they process large amounts of water and have a high capacity for accumulating heavy metals. Here, inspired by the unique physical and physiological features of marine sponges, a surface engineered synthetic sponge for the highly efficient harvesting of uranium from natural seawater is developed. An ultrathin poly(imide dioxime) (PIDO)/alginate (Alg) interpenetrating polymer network hydrogel layer is uniformly wrapped around the skeleton of a melamine sponge (MS) substrate through a simple dippingdrying-crosslinking process, providing the hybrid MS@PIDO/Alg sponge with excellent uranium adsorption performance and sufficient mechanical strength to withstand the harsh conditions of practical applications. The maximum adsorption capacity reaches 910.98 mg-U g-gel -1 for the PIDO/Alg hydrogel layer and 291.51 mg-U g-sponge -1 for the whole hybrid MS@PIDO/ Alg sponge in uranium-spiked natural seawater. The adsorption capacity measured after 56 d of exposure in 5 tons of natural seawater is evaluated to be 5.84 mg-U g-gel -1 (1.87 mg-U g-sponge -1 ). This novel approach shows great promise for the mass production of high-performance sponge adsorbent for uranium recovery from natural seawater and nuclear waste.

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“…Similar approaches have recently re-emerged in other countries, e.g. the USA, 6 coupling sorption and electrochemical separation and even now in China 7 mainly due to its strategic importance. Today the specic uranium sorption on amidoxime is well understood.…”

Section: Introductionmentioning

confidence: 94%

Nuclear fuel cycle, with a liquid ore and fuel: toward renewable energy

Degueldre

Dawson

Najdanovic‐Visak

2019

Sustainable Energy Fuels

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A half-wave rectified alternating current electrochemical method for uranium extraction from seawater

Cited by 423 publications

References 37 publications

Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent

Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent

A Marine‐Inspired Hybrid Sponge for Highly Efficient Uranium Extraction from Seawater

Nuclear fuel cycle, with a liquid ore and fuel: toward renewable energy

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