Confining Ti-oxo clusters in covalent organic framework micropores for photocatalytic reduction of the dominant uranium species in seawater

Zhang, Shuo; Chen, Lixi; Qu, Zhiying; Zhai, Fuwan; Yin, Xiaonan; Zhang, Duo; Shen, Yufei; Li, Hui; Liu, Wei; Sen, Manodeep; Ji, Guoxun; Zhang, Chaofeng; Dai, Xing; Chai, Zhifang; Wang, Shuao

doi:10.1016/j.chempr.2023.06.008

Cited by 43 publications

(27 citation statements)

References 65 publications

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“…10−12 Therefore, it is efficient to convert highly mobile U(VI) to lowmobility U(IV) before treating effluent from uranium mines. 13 Nano zero-valent iron (nZVI) is widely used in the remediation of contaminated groundwater due to its high reactivity and large specific surface area. 14−17 nZVI has shown superior performance in solving environmental problems such as organic matter and heavy metal pollution.…”

Section: Introductionmentioning

confidence: 99%

“…The enrichment and separation of uranium from uranium mine wastewater is a pressing issue that must be addressed. − Uranium is frequently found in two valence states: hexavalent uranium (U(VI)) and tetravalent uranium (U(IV)) . As is well-known, U(VI) mainly exists in the form of soluble UO 2 2+ , which is highly susceptible to migration with groundwater flow, causing a wider range of radioactive contamination and heavy metal poisoning. − Therefore, it is efficient to convert highly mobile U(VI) to low-mobility U(IV) before treating effluent from uranium mines …”

Section: Introductionmentioning

confidence: 99%

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Enhancing Commercially Iron Powder Electron Transport by Surface Biosulfuration to Achieve Uranium Extraction from Uranium Ore Wastewater

Yang,

Wei,

Wang

et al. 2024

Inorg. Chem.

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The zero-valent iron (ZVI) has attracted increasing attention due to the enhanced reactivity of ZVI to uranium wastewater. However, ZVI practical application is hampered due to its susceptibility to oxidation and the formation of passivation layers during storage and in situ restoration. To address these issues, we used a biosulfuration approach to modify ZVI for application in uranium ore wastewater treatment. A series of physicochemical characterization tools and photoelectronic analyses showed that BS-ZVI considerably increased carrier separation efficiency and visible light absorption capacity, resulting in a significant photoassisted enhancement effect on uranium extraction. Accordingly, the uranium removal efficiency of BS-ZVI reached 91% within 60 min, and its maximum adsorption capacity was 336.3 mg/g. By analyzing the mechanism, the improved U(VI) removal performance was mostly responsible on the dissolution of the passivation layer on the surface of ZVI, the generation of Fe(II) and FeS, and the important role of Shewanella putrefaciens extracellular polymers (EPS). Overall, the BS-ZVI biohybrid merges with the high activity of ZVI, bio-FeS, and self-regeneration ability of bacteria, expanding a promising new approach for sustainable treatment of uranium mine wastewater.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Commercially Iron Powder Electron Transport by Surface Biosulfuration to Achieve Uranium Extraction from Uranium Ore Wastewater

Yang,

Wei,

Wang

et al. 2024

Inorg. Chem.

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“…This work lays the groundwork for the design of enhanced photocatalysts based on COF for U(VI) extraction from seawater. Later, Zhang et al 83 achieved excellent photocatalytic reduction of UO 2 (CO 3 ) 3 4− in seawater using visible light. The synergistic effect between the organic photosensitive framework and confined metal-containing clusters plays an indispensable role in the photocatalytic process.…”

Section: Photocatalytic Extractionmentioning

confidence: 99%

Photocatalytic and Electrocatalytic Extraction of Uranium by COFs: A Review

Wen,

Yao,

Meng

et al. 2023

Ind. Eng. Chem. Res.

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The highly selective and effective enrichment of U(VI) from seawater and nuclear industry wastewater is important not only for nuclear power development and dependable energy source, but also for reducing the potential threat of radionuclides to the environment and human health. Covalent organic frameworks (COFs) are ideal materials for trapping U(VI) ions in aqueous solutions because of their advantages such as inherent porosity, strong skeleton, chemical stability, and good structural regularity. Herein, the most recent developments in the investigation of COFs for efficient preconcentration and separation of U(VI) by adsorption, photocatalysis, and electrocatalysis from seawater and radioactive wastewater are reviewed. The performance and related mechanisms of U(VI) interaction with COFs are carefully analyzed from the results of batch sorption experiments, the advanced spectroscopy analysis, and theoretical calculations. The potential and challenges of the present regarding the use of functional COFs for U(VI) extraction are described. Our aim is to provide insight and advice for the creation of innovative functional COFs for U(VI) extraction with high efficiency and selectivity in the future.

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“…Nuclear energy has by far been recognized as one of the most reliable energy sources because of its economic, clean, and renewable characteristics. , Uranium is considered as one of the most essential nuclear reactor fuels among all radionuclides, which makes the extraction of uranium elements indispensable for the development of the energy industry . In contrast to the land with only limited uranium resources, the oceans have been found to contain nearly 99.8% of uranium on earth; extracting uranium from seawater by means of adsorbents has become one of the most promising solutions to the shortage of uranium resources. , So far, adsorbents that have been explored for uranium extraction from seawater are primarily inorganic materials, nanostructured materials, and synthetic polymers . Among them, amidoxime-functionalized polymers have been proven to be the most promising sorbents for large-scale extraction of uranium from seawater .…”

Section: Introductionmentioning

confidence: 99%

Porous Microparticle Preparation via Tuning Electrostatic Breakup Characteristics of a Non-Newtonian Fluid for High-Performance Uranium Extraction

Chen,

Wei,

et al. 2024

Ind. Eng. Chem. Res.

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Although polyamidoxime (PAO)-based materials have been acknowledged as one of the most promising adsorbents for commercial-scale uranium extraction, preparing materials with controllable size, high-performance uranium extraction, and effortless recovery is still challenging. The current study explores the potential of combining the electrohydrodynamic atomization (EHDA) technique with high-performance uranium extraction, where composite microparticles (CMPs) were facilely prepared via the EHDA technique, with the particle size being precisely controlled. The precursor is made of an environmentally friendly aqueous solution of PAO and sodium alginate (SA) at a certain ratio. Droplet breakup mechanism of the PAO/SA precursor under a nonuniform electric field was studied, which would result in PAO/SA CMPs with better controlled size. The produced CMPs were characterized to be a hollow structure, ranging from 100 to 2000 μm in size (long diameter), with interpenetrating nanopores being observed inside the particle shell. The equilibrium adsorption capacity increases gradually from ∼400 to ∼800 mg/g with decreasing particle size from 2200 to 120 μm. Hence, the uranium adsorption performance can be easily tuned to adapt to different application scenarios by altering the CMP size, which can be readily achieved via the EHDA technique. This work offers a novel route for generating high-performance uranium adsorbents with desired size and structure, in a highly efficient, facile, and lowcost way, showing great potential for industrial applications.

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Confining Ti-oxo clusters in covalent organic framework micropores for photocatalytic reduction of the dominant uranium species in seawater

Cited by 43 publications

References 65 publications

Enhancing Commercially Iron Powder Electron Transport by Surface Biosulfuration to Achieve Uranium Extraction from Uranium Ore Wastewater

Enhancing Commercially Iron Powder Electron Transport by Surface Biosulfuration to Achieve Uranium Extraction from Uranium Ore Wastewater

Photocatalytic and Electrocatalytic Extraction of Uranium by COFs: A Review

Porous Microparticle Preparation via Tuning Electrostatic Breakup Characteristics of a Non-Newtonian Fluid for High-Performance Uranium Extraction

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