Fabrication of environmentally sensitive amidoxime hydrogel for extraction of uranium (VI) from an aqueous solution

Liu, Xiaoyang; Xie, Shuguang; Wang, Guohua; Xin, Huang; Duan, Yi; Liu, Haiyan

doi:10.1016/j.colsurfa.2020.125813

Cited by 24 publications

(10 citation statements)

References 51 publications

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“…To obtain the reasonable structure of the DMAO-UO 2 2+ complex, various starting geometries and explored different hydration systems were considered. As shown in Figure S12, UO 2 2+ tends to bind with oxime types N and O, which is consistent with the calculations of Liu et al 48 The binding energy of the most stable hydration complex [UO 2 -DMAO-3(H 2 O)] 2+ is −44.2 kcal/mol (Table S10). The strong interaction of UO 2 -βCD, UO 2 -DMAO and the abundant active sites in the graphene aerogel resulted in the improved uranium adsorption capacity of GDC.…”

Section: ■ Results and Discussionsupporting

confidence: 88%

“…The strong interaction of UO 2 -βCD, UO 2 -DMAO and the abundant active sites in the graphene aerogel resulted in the improved uranium adsorption capacity of GDC. Moreover, the binding free energy between [UO 2 (H 2 O) 4 ] 2+ and βCD is larger than those for the other hydrated metal ions, indicating good selectivity of βCD with U(VI) . The excellent selectivity of amidoxime for U(VI) can also be evidenced by the higher binding free energy between amidoxime and UO 2 2+ than those for other metal ions (Sr 2+ , Cs + , Fe 3+ , etc.)…”

Section: Resultsmentioning

confidence: 93%

“…Moreover, the binding free energy between [UO 2 (H 2 O) 4 ] 2+ and βCD is larger than those for the other hydrated metal ions, indicating good selectivity of βCD with U(VI). 48 The excellent selectivity of amidoxime for U(VI) can also be evidenced by the higher binding free energy between amidoxime and UO 2 2+ than those for other metal ions (Sr 2+ , Cs + , Fe 3+ , etc.). 49 Accordingly, the obtained GDC favored the adsorption of U(VI) over other ions owing to the strong interactions of UO 2 2+ -βCD and UO 2 2+ -amidoxime.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

See 2 more Smart Citations

High-Capacity Amidoxime-Functionalized β-Cyclodextrin/Graphene Aerogel for Selective Uranium Capture

Yang

Wang

et al. 2021

Environ. Sci. Technol.

159

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Uranium extraction from seawater is a grand challenge of mounting severity as the energy demand increases with a growing global population. An amidoxime-functionalized carboxymethyl β-cyclodextrin/graphene aerogel (GDC) is developed for highly efficient and selective uranium extraction via a facile one-pot hydrothermal process. GDC reaches equilibrium in 1 h, and the maximum adsorption capacity calculated from Langmuir model is 654.2 mg/g. Benefiting from the chelation and complexation reaction, the obtained GDC has an excellent selectivity even when the competitive cations, anions, and oil pollutants exist. In addition, the aerogel possesses great mechanical integrity and remains intact after 10 compression cycles. Meanwhile, the GDC can be easily regenerated and maintains a high reusability of 87.3% after 10 adsorption−desorption cycles. It is worthwhile to mention that GDC exhibits an excellent extraction capacity of 19.7 mg/g within 21 days in natural seawater, which is greatly desired in uranium extraction from seawater.

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Section: ■ Results and Discussionsupporting

confidence: 88%

Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 98%

See 1 more Smart Citation

High-Capacity Amidoxime-Functionalized β-Cyclodextrin/Graphene Aerogel for Selective Uranium Capture

Yang

Wang

et al. 2021

Environ. Sci. Technol.

159

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show abstract

“…Overall, the development of practical applications of hydrogel adsorbents is still in its early stages. Therefore, more research efforts are needed in the following aspects: (i) enhancing the regeneration capabilities of hydrogel adsorbents (for instance, the adsorption capacity of most hydrogels will decrease significantly after five adsorption–desorption cycles), (ii) broadening the application range of hydrogels, such as the separation of radioactive and rare earth metal ions, and (iii) fabricating novel smart hydrogels with fast adsorption rates (the development of thermoresponsive and pH-responsive hydrogels with specific ion recognition characteristics under different environmental conditions is promising as a smart adsorbent material, (iv) developing engineered hydrogels (such as hydrogel membranes) with high mechanical strength, and easy separation from water for wastewater treatment, and (v) employing an in situ technique to prepare hydrogels in actual wastewater. The removal of metal ions simultaneously occurs with the formation of hydrogel adsorbents in real wastewater; thus, the traditional synthetic step of adsorbents is not required. , With the development of hydrogel from bench-scale tests into engineering design, it will create possibilities for practical application of adsorbents in real wastewater treatment.…”

Section: Perspectives and Outlookmentioning

confidence: 99%

Progress toward Hydrogels in Removing Heavy Metals from Water: Problems and Solutions—A Review

et al. 2021

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Hydrogels, as a new type of biomaterial with unique physical and chemical characteristics, have three-dimensional solid networks constructed by hydrophilic polymer chains. The superior swell-ability, biocompatibility, and functionalization have made them widely explored and applied in the removal of heavy metals from water. Due to the potential threats of heavy metals, most wastewater systems control industrial discharges at a multiple (e.g., 100 times higher) of the maximum contaminated levels of heavy metals in drinking water. Nevertheless, how to employ the hydrogel adsorbent fabricated in the lab for expanded applications in real wastewater treatment is still a critical challenge. In this review, we scrutinize and emphasize the latest developments in the synthesis and application of hydrogels in removing and recycling heavy metals from water. In particular, the barriers restraining development and scale-up applications are presented, accompanied by the corresponding solutions raised by our point of view. A detailed review is started from the typical synthesis of hydrogels. Afterward, the innovative and representative strategies with computer-aided design for synthesizing hydrogels with the desired capacities are discussed and evaluated. Challenges in perfecting the hydrogels with outstanding properties in improving the anti-interference capability, accelerating the adsorption rate, broadening the operational pH range, enhancing the selectivity, and minimizing the toxicity are clarified. In addition, the mechanical strength, resource recovery, and reusability of the hydrogels as well as reasonable mass transfer models for adsorber design are used in engineering applications. We also shed light on further improving the features of the expected hydrogels.

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“…11−13 Nanocarbon-based materials have shown many benefits of adsorption. 14 Silica-based materials, 15,16 titanium dioxide-based materials, 17 hydrogels, 18,19 magnetic materials, 20,21 biosorbents, 22,23 and nanocarbon-based materials 24−26 offer high levels of adsorption. In recent years, the carbon nanomaterials prepared by molten salt electrolysis have attracted the attention of researchers.…”

Section: ■ Introductionmentioning

confidence: 99%

Study on Uranium Adsorption Property of Carbon Nanotubes Prepared by Molten Salt Electrolysis

Liu

Ma³

et al. 2022

ACS Sustainable Chem. Eng.

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Molten salt electrochemistry to prepare nanocarbon materials by converting CO 2 has attracted much attention.In the present study, carbon nanotubes containing the O element were prepared by converting CO 2 in molten salt. The effects of pH, contact time, and reaction temperature on U(VI) adsorption on the adsorbent were studied. The thermodynamic fitting curve and fitting parameters show that uranyl ions were uniformly adsorbed on the surface of carbon nanotubes as a single layer. The adsorption capacity at 298 K was 150.00 mg g −1 . The selectivity of uranium adsorbents was studied by ion competition experiments. EDS and XPS demonstrate that uranyl ions are adsorbed by the carbon nanotubes, and (UO 2 ) 4 O(OH) 6 is confirmed in the carbon nanotubes after adsorption in the FT-IR, XRD, and XPS analyses. The materials prepared by the molten salt electrochemical method exhibited good application prospects for uranium adsorption.

show abstract

Fabrication of environmentally sensitive amidoxime hydrogel for extraction of uranium (VI) from an aqueous solution

Cited by 24 publications

References 51 publications

High-Capacity Amidoxime-Functionalized β-Cyclodextrin/Graphene Aerogel for Selective Uranium Capture

High-Capacity Amidoxime-Functionalized β-Cyclodextrin/Graphene Aerogel for Selective Uranium Capture

Progress toward Hydrogels in Removing Heavy Metals from Water: Problems and Solutions—A Review

Study on Uranium Adsorption Property of Carbon Nanotubes Prepared by Molten Salt Electrolysis

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