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Article
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Summary: Researchers have developed a stable carbon material for extracting uranium from seawater. This material demonstrates high selectivity and fast kinetics for uranium adsorption, as well as excellent stability and optoelectronic properties for uranium electroextraction. This work expands the application prospects of functionalized 3D carbon materials and provides technical support for electrodeposition adsorption of uranium from seawater.
SCIENCE CHINA-CHEMISTRY
(2023)
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Renping Liang et al.
Summary: A series of donor-acceptor-acceptor (D-A-A) conjugated microporous polymers (CMPs) photocatalysts were innovatively designed by adjusting the ratio between the electron donor benzene (B) and the electron acceptors SO and TH through statistical copolymerization. The band gap of D-A-A polymers could be regulated by statistical copolymerization, and the PBSOTH-2 polymer with a feed ratio of 1.0:3.0:1.5 achieved 99.2% uranium removal when methanol was used as the sacrificial agent. This work established a database for the photocatalytic reduction of uranium by D-A-A terpolymers through statistical copolymerization, providing insights for efficient uranium reduction catalyst design.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
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Wei-Rong Cui et al.
Summary: A hydroxyl-functionalized 3D covalent organic framework (TAPM-DHBD) with strong fluorescence and 3D interconnected pore channels was synthesized and evaluated for uranium detection and extraction. TAPM-DHBD exhibited exceptional uranium extraction capacity and fast kinetics, with an ultra-low detection limit suitable for sensitive and on-site monitoring of radioactive uranium contamination. Furthermore, TAPM-DHBD showed excellent regenerable performance, providing a new strategy for radioactive contamination monitoring and strategic nuclides extraction.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
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Pan He et al.
Summary: The conversion of soluble U(VI) to relatively immobilized U(IV) by photocatalytic techniques is the most effective method to prevent uranium contamination. In this study, a novel photocatalyst (TiO2_x/1T-MoS2) that combines photochemistry and thermoelectric physics is reported. The photocatalyst utilizes oxygen vacancies to improve the photogenerated carrier separation rate and generates a large thermoelectric potential difference through a temperature gradient in the liquid environment, achieving efficient capture of U(VI) species.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
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Xudong Yang et al.
Summary: Tungsten oxide nanowires (WO3_x) with rich oxygen vacancies (OVs) were prepared through a hydrothermal method, demonstrating high adsorption capacity and photocatalytic activity. The WO3_x successfully removed 95.1% of U(VI) at pH 5, with 79.9% being transformed to U(IV) for reductive immobilization. Compared to conventional WO3, WO3_x exhibited narrower band gap energy, higher charge carrier separation, and faster transfer rates, attributed to its construction of oxygen vacancies.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
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Xin Zhong et al.
Summary: In recent years, the D-A covalent organic frameworks (COFs) have been studied for their potential applications in photocatalysis, specifically for the removal of uranium (U(VI)) from wastewater. Three 2D COFs materials (Tp-Tapb, Tp-Taz, and TpTt) with similar structures but different building monomers and acceptor distances were synthesized and compared for their photocatalytic performance and U(VI) removal efficiency. TpTt showed the best performance, attributed to the coexistence of triazine and ketone groups and its high content of heteroatoms.
APPLIED CATALYSIS B-ENVIRONMENTAL
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Xin Liu et al.
Summary: Uranium removal by photocatalytic reduction is effectively achieved using a Z-scheme van der Waals heterojunction photocatalyst (SnS2COF) synthesized by combining covalent organic frameworks (COF) with semiconductor (SnS2). The SnS2COF heterojunction exhibits superior U (VI) reduction capacity in rare earth tailings wastewater due to wider light absorption range, more active sites, and higher electron-hole separation and transfer efficiency. Under photoexcitation, the heterojunction maintains high reducibility and avoids photocorrosion of SnS2. The organic-inorganic heterojunction design concept provides an alternative strategy to enhance photocatalytic performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
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Yi-Ru Chen et al.
Summary: In this study, a hydroquinone-functionalized 3D covalent organic framework (DHBA-TAPM) with unique redox activity and high-affinity hexameric binding sites was developed for selective capture and in situ reduction of radionuclide uranium. The DHBA-TAPM showed significantly higher adsorption capacity and kinetics compared to other similar adsorbents under highly acidic conditions. This work provides a facile strategy for the synthesis of functionalized 3D covalent organic frameworks and opens up the application of redox-active 3D covalent organic frameworks in environmental remediation.
CHEMICAL ENGINEERING JOURNAL
(2023)
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Engineering, Environmental
Kaifu Yu et al.
Summary: In this study, amidoxime-rich g-C3N4 material was successfully synthesized for photo-assisted uranium extraction from seawater. The material exhibited excellent photocatalytic activity and antibacterial properties, overcoming the limitation of uranium extraction caused by marine biofouling.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
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Engineering, Environmental
Xiangbin Lin et al.
Summary: In this study, a COF with optimized relative position of two bidentate ligands is designed for uranium extraction. The optimized ortho-chelating groups with adjacent phenolic hydroxyl groups on the rigid skeleton provide additional uranyl binding sites, resulting in a 150% increase in total binding sites. Experimental and theoretical results demonstrate improved uranyl capture and higher adsorption capacity compared to other COF-based adsorbents in uranium aqueous solution. This ligand engineering strategy enhances the fundamental understanding of sorbent system design for extraction and remediation technology.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
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Shuang Zhang et al.
Summary: In this study, CC/β-MnO2-OVs was synthesized by growing MnO2 on carbon cloth (CC) and creating oxygen vacancies (OVs) through electrochemical methods. The presence of OVs significantly enhanced the selectivity and durability for UO22+. Theoretical calculations revealed that the generation of OVs increased charge transfer and decreased adsorption energy, leading to improved adsorption capacity and kinetics.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
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Peng Wu et al.
Summary: The reduction of soluble U(VI) to insoluble U(IV) precipitates by visible light is an environmentally-friendly and effective method for removing uranium from radioactive wastewater. In this study, a porous hydrogen-bonded organic framework (HOF) called UPC-H4a was synthesized to remove U(VI) from aqueous solutions. The UPC-H4a exhibited high selectivity, strong ion interference resistance, and good reusability, removing 98.18% of U(VI) after 120 minutes of illumination.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
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Fengtao Yu et al.
Summary: A series of D-A(1)-A(2) terpolymers were developed through adjusting the monomer feed molar ratio, which can effectively inhibit charge recombination and facilitate charge separation for the photoreduction of uranium. Among them, PTrSO-2 with a FMR of 0.75:1.0:0.75 achieved a remarkable 99.5% photocatalytic U(VI) reduction efficiency within 120 min of visible-light irradiation, surpassing most reported photocatalysts for similar applications. This work provides a new strategy and unconventional thinking for the development of CMPs photocatalysts in the treatment of radioactive wastewater.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
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Qi Meng et al.
Summary: Researchers prepared metal-free 2D/2D C3N5/GO nanosheets and customized a type-II heterojunction based on band bending theory to enhance uranium extraction capacity. The structure of C3N5 was explained through electron energy loss spectroscopy and synchrotron-based X-ray absorption fine structure, showing a expanded light response range compared to C3N4. Density functional theory was used to demonstrate the presence of alternating energy levels for continuous injection of photogenerated electrons into the surface of GO, resulting in effective electron-hole pair separation and increased material activity. The 2D/2D C3N5/GO heterojunction achieved a high uranium removal ratio of 96.1% even at low concentration and 93.4% after gamma-ray exposure, laying a foundation for future customization of nonmetal-based 2D/2D nanohybrids for uranium-containing wastewater enrichment.
JOURNAL OF HAZARDOUS MATERIALS
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Douchao Mei et al.
Summary: ZIF-90-AO is an efficient U(VI) adsorbent with high adsorption capacity, good selectivity and regeneration properties, as well as excellent antimicrobial activity.
JOURNAL OF HAZARDOUS MATERIALS
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Linsen Yang et al.
Summary: The oceans provide an almost infinite source of uranium, but current methods of extracting uranium from seawater are not economically viable or efficient. A hierarchical porous membrane inspired by fractal structures in biology has been designed to capture uranium effectively, showing potential for fulfilling the vast promise of the oceans as a reliable and sustainable energy source.
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Zhongyue Li et al.
Summary: Two covalent organic framework adsorbents with different surface functional groups were fabricated, showing high uranium extraction capacity and resistance to high temperature at low pH conditions. The adsorbents also demonstrated fast and selective uranium adsorption. The adsorption mechanism was elucidated through X-ray absorption spectroscopy and density functional theory simulations.
CHEMICAL ENGINEERING JOURNAL
(2022)
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Fubing Xiao et al.
Summary: A hydrophilic amidoxime-functionalized porous colloidal crystal hydrogel (HAPCCH) has been developed for the effective adsorption and detection of uranyl ion (UO22+). HAPCCH demonstrates excellent adsorption capacity and selectivity, making it a promising material for water pollution control.
CHEMICAL ENGINEERING JOURNAL
(2022)
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Yiting Song et al.
Summary: The donor-acceptor covalent organic framework TTT-DTDA was found to have long-lived excited states, allowing for direct photoreduction of uranium. Illumination in solutions containing only uranyl ions produced crystalline uranyl peroxide species on the COF. TTT-DTDA COF showed high selectivity for uranium and recyclability in competing ion experiments.
CHEMISTRY OF MATERIALS
(2022)
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Engineering, Environmental
Bo Chen et al.
Summary: In this study, a visible light-driven photocatalyst pTTT-Ben was developed for efficient photocatalytic reduction of U(VI) in highly acidic condition. The pTTT-Ben showed excellent uranium removal capacity and also demonstrated good performance under natural sunlight irradiation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Keng Xuan et al.
Summary: In this work, a nanoscale hydroxyapatite-modified ZIF-67 composite, HAP/ZIF-67, was successfully synthesized using a facile ultrasound-assisted method. HAP/ZIF-67 exhibited abundant functional groups for uranium(VI) binding and showed excellent adsorption capacity and selectivity for U(VI) removal from aqueous solutions, as well as high efficiency for U(VI) elimination from real wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mengjie Hao et al.
Summary: This study presents a new strategy for efficient extraction of uranium from seawater by combining the functions of adsorption and photocatalysis in covalent organic frameworks (COFs). The developed COFs demonstrated exceptional performance in sequestering and reducing uranyl from natural seawater under visible light irradiation, offering promising candidates for efficient uranium extraction.
Article
Chemistry, Physical
Yawen Cai et al.
Summary: This study reports a highly efficient uranium extraction method from water using a piezo-catalytic process. By utilizing a hollow cubic shaped Zn2SnO4/SnO2 as a piezo catalyst, the adsorbed U(VI) is reduced to UO2 and then oxidized to (UO(2)2)(2), which can be efficiently separated from the solution under ultrasonic irradiation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
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Chemistry, Physical
Huanhuan Liu et al.
Summary: The construction of WS2 nanosheets with an oxidized surface showed highly efficient uranium extraction and removal. The O-77-WS2 nanosheets exhibited a high extraction efficiency and capacity for U(VI), possibly due to the involvement of in-situ formed hydroxyl groups in the reduction process.
Article
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Fengtao Yu et al.
Summary: This study reports a novel D-A type conjugated microporous polymer photocatalyst (ECUT-AQ) for photoreduction of uranium in strongly acidic radioactive wastewater. The ECUT-AQ photocatalyst, with its electron-rich perylene unit as donor and electron-deficient anthraquinone (AQ) as acceptor, exhibits excellent electron transport channels and redox activity. The photocatalyst effectively broadens the light absorption range, improves electron-hole pairs separation efficiency, and accelerates electron transfer to UO22+, achieving a high photoreduction rate.
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(2022)
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Hui Yang et al.
Summary: The study demonstrates an adsorption-electrocatalysis strategy using a functionalized iron-nitrogen-carbon catalyst for efficient uranium extraction from seawater, reducing uranium concentration to very low levels and providing technological innovation in this field.
ADVANCED MATERIALS
(2021)
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Wei-Rong Cui et al.
Summary: This study presents a method using covalent organic framework for the selective capture and reduction of uranium, achieving a high uranium capture capacity. DHBD-TMT shows efficient uranium adsorption in both dark and light conditions, with excellent photocatalytic activity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
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Xiaofeng Li et al.
Summary: A pore-free adsorbent with abundant active sites is beneficial for the fast separation of uranium. The two-dimensional olefin-linked conjugated organic polymer prepared in this study showed good stability, excellent fluorescence property, and high N atom content, resulting in excellent performance in uranium adsorption and separation. Its nearly pore-free structure, due to irregular staggered stacking, exhibited fast adsorption behavior towards uranium, confirming the feasibility of pore-free materials for rapid adsorption.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
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Wei-Rong Cui et al.
Summary: A series of robust and hydrophilic benzoxazole-based COFs have been developed as efficient adsorbents for targeted uranium recovery from seawater with improved stability, chemical reduction properties, and high uranium adsorption capacity compared to interfering metals like vanadium.
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Chemistry, Physical
Shuang Liu et al.
Summary: The SUPER method utilizing a bifunctional carbon nitride material, CN550, has shown a significant improvement in both uranium adsorption capacity and photocatalytic activity. Compared to the pure physicochemical adsorption (PA) method, the SUPER method achieved a tenfold higher uranium extraction capacity, reaching up to 1556 mg g(-1).
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
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Fengtao Yu et al.
Summary: A molecular engineering strategy was introduced to enhance the photocatalytic performance of donor-acceptor conjugated microporous polymers for U(VI) reduction. Two new polymers, ECUTCO and ECUT-SO, were designed with tailored acceptors, with ECUT-SO achieving ultrahigh photocatalytic performance for uranium (VI) reduction. Experiments and DFT calculations showed the high dependence of photocatalytic activity on the acceptors, with ECUT-SO demonstrating optimized visible-light response, excellent photo-exciton separation, and stronger coordination sites for UO22+.
CHEMICAL ENGINEERING JOURNAL
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Gong Cheng et al.
Summary: A polyarylether-based covalent organic framework functionalized with open-chain amidoxime was synthesized for efficient uranium extraction from seawater. The adsorbent demonstrated high selectivity for uranium over vanadium, with significantly enhanced adsorption capacity, and high stability, making it a promising material for uranium extraction from natural seawater.
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Kaifu Yu et al.
Summary: In this study, highly active and stable photocatalysts (CCNCI/ZnO) were successfully constructed to efficiently expand the response region of sunlight, leading to a U(VI) enrichment capacity of up to 2405.3 mg/g within 60 minutes. The enhanced stability of CCNCI/ZnO during photocatalysis was attributed to the enhanced entropy of the Cu80Co5Ni5Cd5In5 nanocrystals. Mechanistic studies revealed that hot electrons generated by Cu80Co5Ni5Cd5In5 nanocrystals in CCNCI/ZnO under visible light efficiently reduced U(VI) over the photocatalyst, contributing to its remarkable performance in U(VI) enrichment.
APPLIED CATALYSIS B-ENVIRONMENTAL
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Cheng-Rong Zhang et al.
Summary: A novel amidoxime (AO) crystalline covalent organic framework (BD-TN-AO) with highly conjugated structure and excellent photocatalytic activity is reported, which exhibits high anti-biofouling activity and efficient extraction of uranium from seawater. The framework's outstanding photoinduced effects lead to a high uranium adsorption capacity under simulated sunlight irradiation in microorganism-containing natural seawater.
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Mudasir Ahmad et al.
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Rui-Han Xu et al.
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Yachao Xu et al.
Summary: The TiO2/CPAN-AO catalyst prepared in this paper showed excellent selectivity in reducing uranium and has great potential in large-scale uranium extraction from natural seawater.
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