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Wang H, Zhou L, Ao X, Huang G, Liu Y, Ouyang J, Adesina AA. Ion-imprinted macroporous polyethyleneimine incorporated chitosan/layered hydrotalcite foams for the selective biosorption of U(VI) ions. Int J Biol Macromol 2024; 266:131113. [PMID: 38531524 DOI: 10.1016/j.ijbiomac.2024.131113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 03/13/2024] [Accepted: 03/21/2024] [Indexed: 03/28/2024]
Abstract
In order to prevent uranium pollution and recovery uranium resources, it was necessary to find a highly efficient adsorbent for radioactive wastewater treatment. Herein, U(VI) imprinted polyethyleneimine (PEI) incorporated chitosan/layered hydrotalcite composite foam (IPCL) was synthesized by combining ion-imprinting and freeze-drying techniques. IPCL has a high amino/imino content and an ultralight macroporous structure, making it capable of efficiently adsorbing U(VI) and easy to separate; Especially after ion-imprinting, vacancies matching the size of uranyl ions were formed, significantly improving U(VI) selectivity. The adsorption isotherms and adsorption kinetics were in accordance with the Freundlich model and PSO model respectively, indicating that heterogeneous adsorption of U(VI) by the adsorbents. The adsorption capacity of IPCL-2 for U(VI) reached 278.8. mg/g (under the conditions of optimal pH 5.0, temperature of 298 K, contact time of 2 h, and adsorbent dosage of 0.2 g/L), which is almost double of that for the non-imprinted foam (PCL-2, 138.2 mg/g), indicating that IPCL-2 can intelligently recognize U(VI). The heterogeneous adsorption mechanism of U(VI) by IPCL-2 involves complexation, ion-exchange and isomorphic substitution. The adsorption of U(VI) by IPCL-2 is spontaneous and endothermic. IPCL-2 has excellent adsorption performance for U(VI), and is a promising adsorbent for radioactive pollution control.
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Affiliation(s)
- Huamin Wang
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, 330013 Nanchang, China
| | - Limin Zhou
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, 330013 Nanchang, China; State Key Laboratory for Nuclear Resources and Environment, East China University of Technology, 418 Guanglan Road, 330013 Nanchang, China.
| | - Xianqian Ao
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, 330013 Nanchang, China
| | - Guolin Huang
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, 330013 Nanchang, China.
| | - Yanlin Liu
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, 330013 Nanchang, China
| | - Jinbo Ouyang
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, 330013 Nanchang, China
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Lv Y, Chen L, Zhang A, Sheng G, Liao Q. Two-dimensional titanium carbide decorated nanoscale iron sulfide: Synthesis, characterization, and behavior for uranium (VI) removal. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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3
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Shvydko AV, Prihod’ko SA, Timofeeva MN. Synthesis of Glycerol Carbonate from Glycerol and Dimethyl Carbonate Using Strongly Basic Anion-Exchange Styrene–Divinylbenzene Dowex Resins. CATALYSIS IN INDUSTRY 2022. [DOI: 10.1134/s2070050422020088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Suneesh A, Selvan BR, Ramanathan N. A chemically functionalized hydroxyacetamide anchored polymeric adsorbent for the selective separation of zirconium from acidic aqueous solutions. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Huang T, Su Z, Dai Y, Zhou L. Enhancement of the heterogeneous adsorption and incorporation of uranium VI caused by the intercalation of β-cyclodextrin into the green rust. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 290:118002. [PMID: 34419862 DOI: 10.1016/j.envpol.2021.118002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/15/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
The influence of intercalated anions on the structure and composition of green rusts supplies a theoretical possibility for the investigation of the structural modification of FeII/FeIII (oxyhydr)oxide materials. β-Cyclodextrin was intercalated into the mixed-valent iron-based hydroxide layers to synthesize new green rust materials (β-CD GRs), pursuing high-capacity uraniumVI (UVI) sorption. The molar ratios of FeII to FeIII and the molar ratios of β-CD GR to FeII + FeIII had a significant effect on the synthesis of β-CD GRs. The synthesis process was further optimized by the quadric predictor and desirability function in a central composite design in combination. Both strong acidity and alkalinity were harmful to the adsorption of β-CD GRs towards UVI. The pseudo-first-order kinetic model and Langmuir isotherm model were appropriate in fitting the whole adsorption process. The maximum monolayer adsorption capacity of β-CD GRs was 2548.61 mg/g. The presence of mimic groundwater constituents explicitly deteriorated the interaction between β-CD GR and UVI species. Nanoscale nodules and particles were formed on the β-CD GR after the adsorption experiments. The peaks at 1159 and 609 cm-1 vanished with the band at 1103 cm-1 being left-shifted to 1117 cm-1 in the FTIR spectra of β-CD GR during the heterogeneous process. The intercalation of β-CD brought obvious enhancement of UVI species sorption to the GR material, which was combinedly driven by several reaction pathways and different from the unmodified GRs.
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Affiliation(s)
- Tao Huang
- School of Materials Engineering, Changshu Institute of Technology, 215500, China; Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu, 215500, China; School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
| | - Zhiyu Su
- School of Materials Engineering, Changshu Institute of Technology, 215500, China
| | - Yuxing Dai
- School of Materials Engineering, Changshu Institute of Technology, 215500, China
| | - Lulu Zhou
- School of Materials Engineering, Changshu Institute of Technology, 215500, China
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6
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Molinas M, Faizova R, Brown A, Galanzew J, Schacherl B, Bartova B, Meibom KL, Vitova T, Mazzanti M, Bernier-Latmani R. Biological Reduction of a U(V)-Organic Ligand Complex. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:4753-4761. [PMID: 33705103 PMCID: PMC8154365 DOI: 10.1021/acs.est.0c06633] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 02/24/2021] [Accepted: 03/01/2021] [Indexed: 05/20/2023]
Abstract
Metal-reducing microorganisms such as Shewanella oneidensis MR-1 reduce highly soluble species of hexavalent uranyl (U(VI)) to less mobile tetravalent uranium (U(IV)) compounds. The biologically mediated immobilization of U(VI) is being considered for the remediation of U contamination. However, the mechanistic underpinnings of biological U(VI) reduction remain unresolved. It has become clear that a first electron transfer occurs to form pentavalent (U(V)) intermediates, but it has not been definitively established whether a second one-electron transfer can occur or if disproportionation of U(V) is required. Here, we utilize the unusual properties of dpaea2- ((dpaeaH2═bis(pyridyl-6-methyl-2-carboxylate)-ethylamine)), a ligand forming a stable soluble aqueous complex with U(V), and investigate the reduction of U(VI)-dpaea and U(V)-dpaea by S. oneidensis MR-1. We establish U speciation through time by separating U(VI) from U(IV) by ion exchange chromatography and characterize the reaction end-products using U M4-edge high resolution X-ray absorption near-edge structure (HR-XANES) spectroscopy. We document the reduction of solid phase U(VI)-dpaea to aqueous U(V)-dpaea but, most importantly, demonstrate that of U(V)-dpaea to U(IV). This work establishes the potential for biological reduction of U(V) bound to a stabilizing ligand. Thus, further work is warranted to investigate the possible persistence of U(V)-organic complexes followed by their bioreduction in environmental systems.
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Affiliation(s)
- Margaux Molinas
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Radmila Faizova
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Ashley Brown
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Jurij Galanzew
- Karlsruhe
Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), P.O. 3640, D-76021Karlsruhe, Germany
| | - Bianca Schacherl
- Karlsruhe
Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), P.O. 3640, D-76021Karlsruhe, Germany
| | - Barbora Bartova
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Karin L. Meibom
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Tonya Vitova
- Karlsruhe
Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), P.O. 3640, D-76021Karlsruhe, Germany
| | - Marinella Mazzanti
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Rizlan Bernier-Latmani
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
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Zhang H, Li Y, Cheng B, Ding C, Zhang Y. Synthesis of a starch-based sulfonic ion exchange resin and adsorption of dyestuffs to the resin. Int J Biol Macromol 2020; 161:561-572. [DOI: 10.1016/j.ijbiomac.2020.06.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/28/2020] [Accepted: 06/02/2020] [Indexed: 10/24/2022]
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8
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Ahmad AA. Kinetics of uranium adsorption from sulfate medium by a commercial anion exchanger modified with quinoline and silicate. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07169-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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9
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Dublet G, Worms I, Frutschi M, Brown A, Zünd GC, Bartova B, Slaveykova VI, Bernier-Latmani R. Colloidal Size and Redox State of Uranium Species in the Porewater of a Pristine Mountain Wetland. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:9361-9369. [PMID: 31356746 DOI: 10.1021/acs.est.9b01417] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Uranium (U) speciation was investigated in anoxically preserved porewater samples of a natural mountain wetland in Gola di Lago, Ticino, Switzerland. U porewater concentrations ranged from less than 1 μg/L to tens of μg/L, challenging the available analytical approaches for U speciation in natural samples. Asymmetrical flow field-flow fractionation coupled with inductively coupled plasma mass spectrometry allowed the characterization of colloid populations and the determination of the size distribution of U species in the porewater. Most of the U was associated with three fractions: <0.3 kDa, likely including dissolved U and very small U colloids; a 1-3 kDa fraction containing humic-like organic compounds, dispersed Fe, and, to a small extent, Fe nanoparticles; and a third fraction (5-50 nm), containing a higher amount of Fe and a lower amount of organic matter and U relative to the 1-3 kDa fraction. The proportion of U associated with the 1-3 kDa colloids varied spatially and seasonally. Using anion exchange resins, we also found that a significant proportion of U occurs in its reduced form, U(IV). Tetravalent U was interpreted as occurring within the colloidal pool of U. This study suggests that U(IV) can occur as small (1-3 kDa), organic-rich, and thus potentially mobile colloidal species in naturally reducing wetland environments.
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Affiliation(s)
- Gabrielle Dublet
- Environmental Microbiology Laboratory (EML) , Ecole Polytechnique Federale de Lausanne (EPFL) , EPFL-ENAC-IIE-EML, Station 6 , CH-1015 Lausanne , Switzerland
- Department of Chemistry , University of Oslo , P.O. Box 1033, NO-0315 Oslo , Norway
| | - Isabelle Worms
- Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, School of Earth and Environmental Sciences, Faculty of Sciences , University of Geneva , Uni Carl Vogt, Bvd Carl-Vogt 66 , CH-1211 Geneva 4 , Switzerland
| | - Manon Frutschi
- Environmental Microbiology Laboratory (EML) , Ecole Polytechnique Federale de Lausanne (EPFL) , EPFL-ENAC-IIE-EML, Station 6 , CH-1015 Lausanne , Switzerland
| | - Ashley Brown
- Environmental Microbiology Laboratory (EML) , Ecole Polytechnique Federale de Lausanne (EPFL) , EPFL-ENAC-IIE-EML, Station 6 , CH-1015 Lausanne , Switzerland
| | - Giada C Zünd
- Environmental Microbiology Laboratory (EML) , Ecole Polytechnique Federale de Lausanne (EPFL) , EPFL-ENAC-IIE-EML, Station 6 , CH-1015 Lausanne , Switzerland
| | - Barbora Bartova
- Environmental Microbiology Laboratory (EML) , Ecole Polytechnique Federale de Lausanne (EPFL) , EPFL-ENAC-IIE-EML, Station 6 , CH-1015 Lausanne , Switzerland
| | - Vera I Slaveykova
- Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, School of Earth and Environmental Sciences, Faculty of Sciences , University of Geneva , Uni Carl Vogt, Bvd Carl-Vogt 66 , CH-1211 Geneva 4 , Switzerland
| | - Rizlan Bernier-Latmani
- Environmental Microbiology Laboratory (EML) , Ecole Polytechnique Federale de Lausanne (EPFL) , EPFL-ENAC-IIE-EML, Station 6 , CH-1015 Lausanne , Switzerland
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Wang H, Guo H, Zhang N, Chen Z, Hu B, Wang X. Enhanced Photoreduction of U(VI) on C 3N 4 by Cr(VI) and Bisphenol A: ESR, XPS, and EXAFS Investigation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:6454-6461. [PMID: 31081617 DOI: 10.1021/acs.est.8b06913] [Citation(s) in RCA: 137] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The effect of Cr(VI) and bisphenol A (BPA) on U(VI) photoreduction by C3N4 photocatalyst was demonstrated by the batch experiments, electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) techniques. The batch experiments manifested that Cr(VI) and BPA enhanced the photocatalytic activity of C3N4 for U(VI) photoreduction, whereas U(VI) photoreduction was significantly diminished with increased pH from 4.0 to 8.0. According to radical scavengers and ESR analysis, U(VI) was photoreduced to U(IV) by photogenerated electrons of conduction band edge, whereas Cr(VI) was reduced to Cr(III) by H2O2. BPA and its products such as organic acid and alcohols can capture photoinduced holes, which resulted in the enhancement of U(VI) photoreduction to U(IV). XPS and XANES analyses demonstrated that U(VI) was gradually photoreduced to U(IV) by C3N4 within irradiation 60 min, whereas U(IV) was reoxidized to U(VI) with increasing irradiation time. EXAFS analysis determined that the dominant interaction mechanisms of U(VI) on C3N4 after irradiation for 240 min were reductive precipitation and inner-sphere surface complexation. This work highlights the synergistic removal of radionuclides, heavy metals, and persistent organic pollutants by C3N4, which is crucial for the design and application of a high-performance photocatalyst in actual environmental cleanup.
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Affiliation(s)
- Huihui Wang
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering , North China Electric Power University , Beijing 102206 , P. R. China
- School for Radiological and Interdisciplinary Sciences , Soochow University and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions , 215123 Suzhou , P. R. China
- School of Life Science , Shaoxing University , Huancheng West Road 508 , Shaoxing 312000 , P. R. China
| | - Han Guo
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering , North China Electric Power University , Beijing 102206 , P. R. China
| | - Ning Zhang
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering , North China Electric Power University , Beijing 102206 , P. R. China
| | - Zhongshan Chen
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering , North China Electric Power University , Beijing 102206 , P. R. China
| | - Baowei Hu
- School of Life Science , Shaoxing University , Huancheng West Road 508 , Shaoxing 312000 , P. R. China
| | - Xiangke Wang
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering , North China Electric Power University , Beijing 102206 , P. R. China
- School for Radiological and Interdisciplinary Sciences , Soochow University and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions , 215123 Suzhou , P. R. China
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11
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Synthesis of nanoscale zero-valent iron loaded chitosan for synergistically enhanced removal of U(VI) based on adsorption and reduction. J Colloid Interface Sci 2019; 552:735-743. [PMID: 31176920 DOI: 10.1016/j.jcis.2019.05.109] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/30/2019] [Accepted: 05/31/2019] [Indexed: 12/17/2022]
Abstract
In this study, chitosan (CS) loading well-dispersed nanoscale zero-valent iron (NZVI/CS) was successfully prepared via the liquid-phase reduction method. Characterizations of the NZVI/CS with high-resolution transmission electron microscopy and X-ray diffraction suggested that the as-prepared NZVI/CS comprised numerous dispersed Fe0 nanoparticles. Synergistic adsorption and reduction occurred during the removal process based on X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Influence of pH, contract time and temperature on U(VI) removal were investigated. The high removal capacity and rapid removal kinetics were predominately ascribed to the existence of well-distributed NZVI, which could rapidly reduce U(VI) into U(IV). The removal process could be better depicted by the Langmuir isotherm model and the pseudo-second-order kinetic model. The thermodynamic parameters showed that the removal process was exothermic. These findings indicate that the synthesized NZVI/CS composites have potential application for the removal of U(VI) from the sewage water.
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12
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Li GR, Xu MY, Li JK, Yang Y. A study on the preparation and application of a core-shell surface imprinted uranyl magnetic chelating adsorbent. RSC Adv 2018; 8:37401-37409. [PMID: 35557815 PMCID: PMC9089315 DOI: 10.1039/c8ra06992a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 10/09/2018] [Indexed: 11/21/2022] Open
Abstract
A core-shell surface imprinted uranyl magnetic chelating adsorbent (UMCA) was synthesized by combining the sol-gel process with the surface molecular imprinting technique (SMIT). A specific salophen and uranyl-salophen were designed and synthesized. Then, the synthesized uranyl-salophen complex was used as a template (in which uranyl is the target analyte), 3-aminopropyltriethoxysilane as a functional monomer and tetraethylorthosilicate as a cross-linker. The obtained UMCA was characterized by a variety of modern analytical and detection techniques. The adsorbent can be used for the solid-phase extraction of uranyl with good selectivity, high adsorption capacity, magnetic separation characteristics and good reusability. The chelating sorbent was successfully applied for the separation of uranyl, followed by multiphase photocatalytic resonance fluorescence method determination in several environmental water samples with a relative standard deviation of <5.48% and spiked recoveries of 92.5% to 103.0%. The adsorption mechanism was preliminarily discussed.
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Affiliation(s)
- Gui-Rong Li
- College of Public Health, University of South China Hengyang 421001 PR China +86 734 8281771 +86 734 8281391
| | - Meng-Yuan Xu
- College of Public Health, University of South China Hengyang 421001 PR China +86 734 8281771 +86 734 8281391
| | - Jie-Kang Li
- College of Public Health, University of South China Hengyang 421001 PR China +86 734 8281771 +86 734 8281391
| | - Yang Yang
- College of Public Health, University of South China Hengyang 421001 PR China +86 734 8281771 +86 734 8281391
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Chen H, Chen Z, Zhao G, Zhang Z, Xu C, Liu Y, Chen J, Zhuang L, Haya T, Wang X. Enhanced adsorption of U(VI) and 241Am(III) from wastewater using Ca/Al layered double hydroxide@carbon nanotube composites. JOURNAL OF HAZARDOUS MATERIALS 2018; 347:67-77. [PMID: 29289767 DOI: 10.1016/j.jhazmat.2017.12.062] [Citation(s) in RCA: 108] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 12/22/2017] [Accepted: 12/23/2017] [Indexed: 06/07/2023]
Abstract
Ca/Al layered double hydroxide decorated carbon nanotube (Ca/Al-LDH@CNTs) composites were fabricated by co-precipitation method and hydrothermal aged treatment. The prepared Ca/Al-LDH@CNTs was characterized by SEM, TEM, EDS, XRD, FT-IR, UV-vis and XPS techniques, and applied to remove U(VI) from aqueous solutions under various environmental conditions (i.e., pH, ionic strength, temperature and contact time). The results indicated that the adsorption of U(VI) on Ca/Al-LDH@CNTs was four times higher than that of U(VI) on bare CNTs. The kinetic investigations reflected the chemisorption of U(VI) on Ca/Al-LDH@CNTs through oxygen-containing functional groups. The adsorption isotherms demonstrated that the adsorption of U(VI) was well fitted by Langmuir model and the maximum adsorption capacity of U(VI) on Ca/Al-LDH@CNTs was calculated to be 382.9 mg g-1 at 289.15 K. The thermodynamic parameters calculated from temperature-dependent isotherms suggested that U(VI) adsorption on Ca/Al-LDH@CNTs were endothermic and spontaneous process. Furthermore, Ca/Al-LDH@CNTs could remove ∼91% of 241Am(III) at pH = 8.0, which confirmed Ca/Al-LDH@CNTs as a promising material for multiply low level radionuclides' pollution remediation.
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Affiliation(s)
- Haijun Chen
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; School of Chemistry, Biological and Materials Sciences, East China University of Technology, Nanchang, 330013, PR China
| | - Zhe Chen
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Guixia Zhao
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
| | - Zhibin Zhang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; School of Chemistry, Biological and Materials Sciences, East China University of Technology, Nanchang, 330013, PR China.
| | - Chao Xu
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Yunhai Liu
- Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China
| | - Jing Chen
- Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China
| | - Li Zhuang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Tasawar Haya
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Xiangke Wang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; School of Chemistry, Biological and Materials Sciences, East China University of Technology, Nanchang, 330013, PR China; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, PR China.
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14
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Liu S, Ma J, Zhang W, Luo F, Luo M, Li F, Wu L. Three-dimensional graphene oxide/phytic acid composite for uranium(VI) sorption. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4162-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Singare PU. Radiotracers in performance evaluation of nuclear grade resins Amberlite IRN-78 and Purolite NRW-8000. KERNTECHNIK 2014. [DOI: 10.3139/124.110391] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The present paper deals with evaluation of organic base nuclear grade anion exchange resins Amberlite IRN-78 and Purolite NRW-8000 by application of radioactive tracer isotopes 131I and 82Br. The evaluation was made on the basis of their performance in iodide and bromide ion-isotopic exchange reactions carried out under different experimental conditions like temperature and ionic concentration. It was observed that during iodide ion-isotopic exchange reaction at a constant temperature of 30.0 °C, as the concentration of labeled iodide ion solution increases from 0.001 mol/L to 0.004 mol/L, the percentage of iodide ions exchanged increases from 70.10 % to 77.10 % for Amberlite IRN-78, which was higher than an increase of 63.90 % to 71.00 % as obtained for Purolite NRW-8000 resins. Also at a constant temperature of 30.0 °C, using 1.000 g of ion exchange resins and 0.001 mol/L labeled iodide ion solution, the values of specific reaction rate (min−1), amount of iodide ion exchanged (mmol), initial rate of iodide ion exchange (mmol/min) and log Kd were calculated to be 0.280, 0.175, 0.049 and 11.4 respectively for Amberlite IRN-78 resin, which was higher than the values of 0.258, 0.160, 0.041 and 10.6 respectively as that obtained by using Purolite NRW-8000 resins. The identical trend was observed for the two resins during bromide ion-isotopic exchange reaction. The results of present investigation also indicate that during the two ion-isotopic exchange reactions, for both the resins, there exists a strong positive linear correlation between amount of ions exchanged and concentration of ionic solution; and strong negative correlation between amount of ions exchanged and temperature of exchanging medium. The overall results indicate that under identical experimental conditions, Amberlite IRN-78 resins show superior performance over Purolite NRW-8000 resins.
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Affiliation(s)
- P. U. Singare
- Department of Chemistry , Bhavan's College, Munshi Nagar, Andheri (West), Mumbai 400 058 , India
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Stoliker DL, Campbell KM, Fox PM, Singer DM, Kaviani N, Carey M, Peck NE, Bargar JR, Kent DB, Davis JA. Evaluating chemical extraction techniques for the determination of uranium oxidation state in reduced aquifer sediments. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9225-9232. [PMID: 23875928 DOI: 10.1021/es401450v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Extraction techniques utilizing high pH and (bi)carbonate concentrations were evaluated for their efficacy in determining the oxidation state of uranium (U) in reduced sediments collected from Rifle, CO. Differences in dissolved concentrations between oxic and anoxic extractions have been proposed as a means to quantify the U(VI) and U(IV) content of sediments. An additional step was added to anoxic extractions using a strong anion exchange resin to separate dissolved U(IV) and U(VI). X-ray spectroscopy showed that U(IV) in the sediments was present as polymerized precipitates similar to uraninite and/or less ordered U(IV), referred to as non-uraninite U(IV) species associated with biomass (NUSAB). Extractions of sediment containing both uraninite and NUSAB displayed higher dissolved uranium concentrations under oxic than anoxic conditions while extractions of sediment dominated by NUSAB resulted in identical dissolved U concentrations. Dissolved U(IV) was rapidly oxidized under anoxic conditions in all experiments. Uraninite reacted minimally under anoxic conditions but thermodynamic calculations show that its propensity to oxidize is sensitive to solution chemistry and sediment mineralogy. A universal method for quantification of U(IV) and U(VI) in sediments has not yet been developed but the chemical extractions, when combined with solid-phase characterization, have a narrow range of applicability for sediments without U(VI).
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