Highly efficient removal of uranium(<scp>vi</scp>) from wastewater by polyacrylic acid hydrogels

Yi, Xiaofeng; Xu, Zhiqun; Liu, Yan; Xueyong, Guo; Ou, Minrui; Xu, Xiaoping

doi:10.1039/c6ra26846c

Cited by 129 publications

(56 citation statements)

References 42 publications

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“…The sample a and i are this Zn 2+ –PAO hydrogel membrane, the other adsorption capacities of (b–k) and (m–o) samples were cited from refs. 35, 36, 47–50, 39, 51–55, and 42, respectively.…”

Section: Methodsmentioning

confidence: 99%

An Ion‐Crosslinked Supramolecular Hydrogel for Ultrahigh and Fast Uranium Recovery from Seawater

et al. 2020

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Large‐scale uranium extraction from seawater is a crucial but challenging part of nuclear power generation. In this study, a new ion‐crosslinked supramolecular Zn2+–poly(amidoxime) (PAO) hydrogel that can super‐efficiently adsorb uranium from seawater is explored. By simply mixing two solutions of zinc chloride and PAO, a supramolecular Zn2+–PAO hydrogel is achieved via the interaction between zinc cations and amidoxime anions. In contrast with existing amidoxime‐functionalized hydrogel‐based adsorbents having low PAO contents and fiber‐based adsorbents with weak hydrophilicity, the PAOs can be directly crosslinked using a small quantity of superhydrophilic zinc ion. Thus, a supramolecular hydrogel is formed, having both a high content of well‐dispersed PAOs and good hydrophilicity. Relative to reported adsorbents, this low‐cost hydrogel membrane exhibits outstanding uranium adsorption performance, reaching 1188 mg g-1 of MU/Mdry gel in 32 ppm uranium‐spiked water. More importantly, after immersion in natural seawater for only 4 weeks, the uranium extraction capacity of the Zn2+–PAO hydrogel membrane reaches 9.23 mg g-1 of MU/Mdry gel. This work can provide a general strategy for designing a new type of supramolecular hydrogel, crosslinked by various bivalent/multivalent cation‐crosslinkers and even many other superhydrophilic supramolecular crosslinkers, for the high‐efficient and massive extraction of uranium from seawater.

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Section: Methodsmentioning

confidence: 99%

An Ion‐Crosslinked Supramolecular Hydrogel for Ultrahigh and Fast Uranium Recovery from Seawater

et al. 2020

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“…[1][2][3][4][5] A large number of harmful substances are constantly entering the water bodies due to human activities, and water pollution is becoming increasingly serious. [6][7][8][9][10][11][12][13] Among them, due to the extensive toxic effects of heavy metal pollutants, water pollution has caused widespread concern. Therefore, the removal of heavy metal ions has become one of the hot topics in the scientic community.…”

Section: Introductionmentioning

confidence: 99%

Optimized synthesis of novel hydrogel for the adsorption of copper and cobalt ions in wastewater

Zhang

et al. 2019

RSC Adv.

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“…When more NH 4 + is present in the wastewater, more ions couple to the active –COO − groups in the hydrogel, hence the proportional increase in total sorption. In theory, this trend is expected to manifest until the available –COO − sites are completely saturated with ammonium ions 34 . Detailed equilibrium studies are warranted for a more accurate understanding of the sorption kinetics and mechanism and to predict further sorption behavior.…”

Section: Discussionmentioning

confidence: 99%

Rapid removal of ammonium from domestic wastewater using polymer hydrogels

Cruz

Luckman

Seviour

et al. 2018

Sci Rep

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To date, technologies to recover ammonium from domestic wastewater from the mainstream have not found widespread application. This is largely due to the low ammonium concentrations in these wastewater streams. This paper reports on the use of polymer hydrogels for rapid sorption of ammonium from domestic wastewater coupled with efficient regeneration by mild acid washing. The sorption capacity of the hydrogel was 8.8–32.2 mg NH4–N/g, which corresponds to removal efficiencies ranging from 68% to 80% NH4–N, increasing proportionally with the initial ammonium concentration. It was, however, unaffected by changes in pH, as the sorption capacity remained constant from pH 5.0–8.0. Importantly, effective regeneration of the hydrogels under mildly acidic conditions (i.e. pH 4.0) was demonstrated with minimal loss in sorption performance following multiple sorption/desorption cycles. Overall, this study highlights the potential of low-cost polymer hydrogels for achieving mainstream ammonium recovery from domestic wastewater.

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Highly efficient removal of uranium(vi) from wastewater by polyacrylic acid hydrogels

Abstract: Polyacrylic acid (PAA) hydrogel prepared by radical polymerization in a clean and extremely simple way was used to adsorb U(vi) ions from aqueous solutions.

Cited by 129 publications

References 42 publications

An Ion‐Crosslinked Supramolecular Hydrogel for Ultrahigh and Fast Uranium Recovery from Seawater

An Ion‐Crosslinked Supramolecular Hydrogel for Ultrahigh and Fast Uranium Recovery from Seawater

Optimized synthesis of novel hydrogel for the adsorption of copper and cobalt ions in wastewater

Rapid removal of ammonium from domestic wastewater using polymer hydrogels

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