1
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Wang M, Sun W, Li M, Wu X, Chen C, Cai T, Zeng Q, Hua Y, Wang L, Xie H. π-electron injection activated dormant ligands in graphitic carbon nitride for efficient and stable uranium extraction. JOURNAL OF HAZARDOUS MATERIALS 2024; 478:135445. [PMID: 39116743 DOI: 10.1016/j.jhazmat.2024.135445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 08/04/2024] [Accepted: 08/05/2024] [Indexed: 08/10/2024]
Abstract
Graphitic carbon nitride (CN) as an adsorbent exhibit promising potential for the removal of uranium in water. However, the lack of active sites seriously restricts its practical application. In contrast to the traditional method of introducing new ligands, we propose a strategy to activate original ligands on CN by injecting π electrons, which can be realized by grafting 4-phenoxyphenol (PP) on CN (PCN). Compared with CN, the maximum adsorption capacity of PCN for uranium increased from 150.9 mg/g to 380.6 mg/g. Furthermore, PCN maintains good adsorption properties over a wide range of uranium concentrations (1 ∼ 60 mg/L) and pH (4 ∼ 8). After 5 consecutive cycles, PCN exhibited sustained uranium removal performance with a little of losses. The experimental and theoretical results show that the enhancement of adsorption performance is mainly due to the ligands activation of CN by delocalization of π electrons from PP. Furthermore, this activation can be enhanced by irradiation, as the CN can be photoexcited to provide additional photoelectrons for PP. As a result, dormant ligands such as N-CN, C-O-C, C-N-H and N-(C)3 can be activated to participate in coordination with uranium. This work provides theoretical guidance for the design and preparation of high efficiency uranium adsorbent.
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Affiliation(s)
- Minjie Wang
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China
| | - Wenxiu Sun
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China
| | - Mi Li
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China
| | - Xiaoyan Wu
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China
| | - Chaomeng Chen
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China; Boke Environmental Engineering Co., Ltd. of Hunan Province, Hengyang, Hunan 421001, PR China
| | - Tao Cai
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China.
| | - Qingyi Zeng
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China.
| | - Yilong Hua
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China
| | - Longlu Wang
- College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts & Telecommunications (NJUPT), Wenyuan Road, Nanjing 210023, PR China
| | - Haijiao Xie
- Hangzhou Yanqu Information Technology Co., Ltd., Y2, 2nd Floor, Building 2, Xixi Legu Creative Pioneering Park, No. 712 Wen'er West Road, Xihu District, Hangzhou City, Zhejiang Province 310003, PR China
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2
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Chen X, Cai S, Zhang N, Yang J, Peng T, Yang F. Biosorption of U(VI) and mechanisms by live and dead cells of Sphingopyxis sp. YF1. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:109469-109480. [PMID: 37924175 DOI: 10.1007/s11356-023-29881-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 09/10/2023] [Indexed: 11/06/2023]
Abstract
Heavy metal pollution seriously threatens the environment and human health. The biosorption of heavy metals has attracted worldwide attention due to its cost-effectiveness and environmental friendliness. It is significant to develop biosorbents with excellent adsorption performance. Sphingopyxis is widely used in the removal of various organic pollutants, but its potential application in heavy metal adsorption has been largely overlooked. This study investigates the biosorption of U(VI) onto live and dead cells of a Sphingopyxis strain YF1. The effects of pH, contact time and initial ion concentration on U(VI) adsorption investigated, and kinetic and isothermal models were used to fit the adsorption results. The results show that under pH 3-6, the adsorption of U(VI) by YF1 live cells increased with the increase of the pH. Both the pseudo-first order and pseudo-second order models can satisfactorily interpret the adsorption by live and dead cells. Three isothermal adsorption models (Langmuir, Freundlich, and Sips) were used to fit the adsorption process. The adsorption of uranium by live and dead cells was best fitted by the Sips model. The maximal adsorption capacities of U(VI) by live and dead cells were 140.7 mg g-1 and 205.7 mg g-1, respectively. The mechanisms of U(VI) adsorption by Sphingopyxis sp. YF1 were revealed. Scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS) show that U(VI) was deposited on the surface of the bacterial cells. Fourier-transform infrared spectroscopy (FTIR) shows that amine, hydroxyl, alkyl, amide I, amide II, phosphate, carboxylates and carboxylic acids were the major functional groups that are involved in U(VI) adsorption by live and dead cells. X-ray photoelectron spectroscopy (XPS) suggests that the main functional groups of live cells involved in adsorption were O = C-O, C-OH/C-O-C and N-C = O. This study indicates Sphingopyxis sp. YF1 is a high-efficiency U(VI)-adsorbing strain, promising to remove U(VI) from aquatic environment.
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Affiliation(s)
- Xinxin Chen
- School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Siheng Cai
- School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Nan Zhang
- School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Jieqiu Yang
- School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Tangjian Peng
- Hunan Province Key Laboratory of Typical Environmental Pollution and Health Hazards, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Fei Yang
- Hunan Province Key Laboratory of Typical Environmental Pollution and Health Hazards, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China.
- Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiangya School of Public Health, Central South University, Changsha, China.
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3
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Wang G, Liu Y, Wang J, Xiang J, Zeng T, Li S, Song J, Zhang Z, Liu J. The remediation of uranium-contaminated groundwater via bioreduction coupled to biomineralization with different pH and electron donors. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:23096-23109. [PMID: 36316554 DOI: 10.1007/s11356-022-23902-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Stimulating indigenous microbes to reduce aqueous U(VI) to insoluble U(IV) by adding an electron donor has been applied as an applicable strategy to remediate uranium-contaminated groundwater in situ. However, biogenic U(IV) minerals are susceptible to oxidative remobilization after exposure to oxygen. To enhance the stability of the end product, glycerol phosphate (GP) was selected to treat artificial uranium-containing groundwater at different pH values (i.e., 7.0 and 5.0) with glycerol (GY) as the control group. The results revealed that removal ratios of uranium with GP were all higher than those with GY, and reduced crystalline U(IV)-phosphate and U(VI)-phosphate minerals (recalcitrant to oxidative remobilization) were generated in the GP groups. Although bioreduction efficiency was influenced at pH 5.0, the stability of the end product with GP was elevated significantly compared with that with GY. Mechanism analysis demonstrated that GP could activate bioreduction and biomineralization of the microbial community, and two stages were included in the GP groups. In the early stage, bioreduction and biomineralization were both involved in the immobilization process. Subsequently, part of the U(VI) precipitate was gradually reduced to U(IV) precipitate by microorganisms. This work implied that the formation of U-phosphate minerals via bioreduction coupled with biomineralization potentially offers a more effective strategy for remediating uranium-contaminated groundwater with long-term stability.
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Affiliation(s)
- Guohua Wang
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China
| | - Ying Liu
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Jiali Wang
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Jinjing Xiang
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Taotao Zeng
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Shiyou Li
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Jian Song
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Zhiyue Zhang
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China
| | - Jinxiang Liu
- Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China.
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China.
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4
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Sorption of U(VI) on farming and natural soils from northwest China. J Radioanal Nucl Chem 2023. [DOI: 10.1007/s10967-022-08720-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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5
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Yomogida T, Akiyama D, Ouchi K, Kumagai Y, Higashi K, Kitatsuji Y, Kirishima A, Kawamura N, Takahashi Y. Application of High-Energy-Resolution X-ray Absorption Spectroscopy at the U L 3-Edge to Assess the U(V) Electronic Structure in FeUO 4. Inorg Chem 2022; 61:20206-20210. [PMID: 36459052 PMCID: PMC9768738 DOI: 10.1021/acs.inorgchem.2c03208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
FeUO4 was studied to clarify the electronic structure of U(V) in a metal monouranate compound. We obtained the peak splitting of spectra utilizing high-energy-resolution fluorescence detection-X-ray absorption near-edge structure (HERFD-XANES) spectroscopy at the U L3-edge, which is a novel technique in uranium(V) monouranate compounds. Theoretical calculations revealed that the peak splitting was caused by splitting of the 6d orbital of U(V) in FeUO4, which would be used to detect minor U(V) species. Such distinctive electronic states are of major interest to researchers and engineers working in various fields, from fundamental physics to the nuclear industry and environmental sciences for actinide elements.
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Affiliation(s)
- Takumi Yomogida
- Department
of Earth and Planetary Science, The University
of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan,Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan,
| | - Daisuke Akiyama
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 1-1 Katahira 2, Aoba, Sendai, Miyagi 980-8577, Japan
| | - Kazuki Ouchi
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan
| | - Yuta Kumagai
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan
| | - Kotaro Higashi
- Center
for Synchrotron Radiation Research, Japan
Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
| | - Yoshihiro Kitatsuji
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan
| | - Akira Kirishima
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 1-1 Katahira 2, Aoba, Sendai, Miyagi 980-8577, Japan
| | - Naomi Kawamura
- Center
for Synchrotron Radiation Research, Japan
Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
| | - Yoshio Takahashi
- Department
of Earth and Planetary Science, The University
of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan,Isotope Science
Center, University of Tokyo, Bunkyo, Tokyo 113-0032, Japan,Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, KEK, Tsukuba, Ibaraki 305-0801, Japan
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6
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Li Y, Dai Y, Tao Q, Xu L. Synthesis and characterization of amino acid-functionalized chitosan/poly(vinyl alcohol) for effective adsorption of uranium. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08587-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Ou M, Li W, Zhang Z, Xu X. β-Cyclodextrin and diatomite immobilized in sodium alginate biosorbent for selective uranium(VI) adsorption in aqueous solution. Int J Biol Macromol 2022; 222:2006-2016. [DOI: 10.1016/j.ijbiomac.2022.09.290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 09/29/2022] [Accepted: 09/30/2022] [Indexed: 11/05/2022]
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8
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Polymeric nano-films with spatially arranged compartments for uranium recovery from seawater. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Kaushik A, Marvaniya K, Kulkarni Y, Bhatt D, Bhatt J, Mane M, Suresh E, Tothadi S, Patel K, Kushwaha S. Large-area self-standing thin film of porous hydrogen-bonded organic framework for efficient uranium extraction from seawater. Chem 2022. [DOI: 10.1016/j.chempr.2022.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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10
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Akl ZF, Zaki EG, ElSaeed SM. Green Hydrogel-Biochar Composite for Enhanced Adsorption of Uranium. ACS OMEGA 2021; 6:34193-34205. [PMID: 34963906 PMCID: PMC8697026 DOI: 10.1021/acsomega.1c01559] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 11/30/2021] [Indexed: 05/15/2023]
Abstract
Uranium is the backbone of the nuclear fuel used for energy production but is still a hazardous environmental contaminant; thus, its removal and recovery are important for energy security and environmental protection. So far, the development of biocompatible, efficient, economical, and reusable adsorbents for uranium is still a challenge. In this work, a new orange peel biochar-based hydrogel composite was prepared by graft polymerization using guar gum and acrylamide. The composite's structural, morphological, and thermal characteristics were investigated via Fourier transform infrared (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) methods. The composite's water absorption properties were investigated in different media. The performance of the prepared composite in adsorbing uranium (VI) ions from aqueous media was systematically investigated under varying conditions including solution's acidity and temperature, composite dose, contact time, and starting amount of uranium. The adsorption efficiency increased with solution pH from 2 to 5.5 and composite dose from 15 to 50 mg. The adsorption kinetics, isotherms, and thermodynamics parameters were analyzed to get insights into the process's feasibility and viability. The equilibrium data were better described through a pseudo-second-order mechanism and a Langmuir isotherm model, indicating a homogeneous composite surface with the maximum uranium (VI) adsorption capacity of 263.2 mg/g. The calculated thermodynamic parameters suggested that a spontaneous and endothermic process prevailed. Interference studies showed high selectivity toward uranium (VI) against other competing cations. Desorption and recyclability studies indicated the good recycling performance of the prepared composite. The adsorption mechanism was discussed in view of the kinetics and thermodynamics data. Based on the results, the prepared hydrogel composite can be applied as a promising, cost-effective, eco-friendly, and efficient material for uranium (VI) decontamination.
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Affiliation(s)
- Zeinab F. Akl
- Egyptian
Atomic Energy Authority (EAEA), P.O.
Box 11762 Cairo, Egypt
| | - Elsayed G. Zaki
- Egyptian
Petroleum Research Institute (EPRI), P.O. Box 11727 Cairo, Egypt
| | - Shimaa M. ElSaeed
- Egyptian
Petroleum Research Institute (EPRI), P.O. Box 11727 Cairo, Egypt
- National
Committee of Women in Science (ASRT), 11334 Cairo, Egypt
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11
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Cai B, Li S, Jiang W, Zhou Y. pH-Controlled Stereoregular Polymerization of Poly(methyl methacrylate) in Vesicle Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:12746-12752. [PMID: 34672599 DOI: 10.1021/acs.langmuir.1c02382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Here, we report a pH-controlled stereoregular polymerization of methyl methacrylate (MMA) inside the membrane of H20-COOH hyperbranched polymer vesicles using a common radical polymerization process. The vesicle size decreases from 745 to 214 nm with an increase of solution pH from 2.60 to 7.26, and the isotacticity of the obtained polymethyl methacrylates (PMMAs) is accordingly elevated from 9 to 35%. The obtained isotactic-rich PMMAs show a lower glass transition temperature depending on the isotacticity than the commercial random PMMAs. A mechanism study according to the in situ Fourier transform infrared measurements indicates that the control of polymer isotacticity results from the monomer conformation confined effect inside the thin vesicle membranes. The present study provides a new method to realize the preparation of isotactic polymers with the characteristics of facile synthesis, pH controllability, and a green polymerization process in aqueous solution as well as under mild reaction conditions of ambient temperature and pressure.
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Affiliation(s)
- Beike Cai
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Shanlong Li
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Wenfeng Jiang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Yongfeng Zhou
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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12
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Wang H, Liu R, Wang H, Hu B, Qiu M. High effective enrichment of U(VI) from aqueous solutions on versatile crystalline carbohydrate polymer-functionalized graphene oxide. Dalton Trans 2021; 50:14009-14017. [PMID: 34546242 DOI: 10.1039/d1dt02497c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The removal of uranium on various sorbents has been widely employed in recent times. However, the limited sorption capacities of these sorbents inhibit the actual application of the radionuclide in actual environments. The development of a novel material with high sorption capacity and superior regeneration for the removal of uranium is highly desirable. Therefore, a versatile class of crystalline carbohydrate polymers (COF) was prepared from organic compounds. Moreover, COF-functionalized graphene oxide (COF/GO) was synthesized and tested for the removal of U(VI) from aqueous solutions. The batch characterization showed that COF was vertically oriented on the surface of GO using diboronic acid as nucleation sites. The maximum removal capacity of U(VI) on COF/GO reached 117.67 mg g-1, and was attributed to a huge void ratio and various oxygen-bearing functional groups. In addition, the inner-sphere surface-complexation dominated the U(VI) removal, and the adsorption mechanism of inner-sphere surface-complexation was transferred into surface precipitation with increasing reaction time. COF/GO can be converted into conductive carbon and reduced GO (C/rGO) nanocomposite, which has high specific capacitance. These results suggested that GO-based materials can be considered as promising candidates for the enrichment of U(VI) and energy storage.
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Affiliation(s)
- Hai Wang
- School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, P.R. China.
| | - Renrong Liu
- School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, P.R. China.
| | - Huifang Wang
- School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, P.R. China.
| | - Baowei Hu
- School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, P.R. China.
| | - Muqing Qiu
- School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, P.R. China.
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13
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Yue Z, Dexin D, Guangyue L, Haitao Y, Kaige Z, Nan H, Hui Z, Zhongran D, Jianhong M, Feng L, Jing S, Yongdong W. Enhanced effects and mechanisms of Syngonium podophyllum-Peperomia tetraphylla co-planting on phytoremediation of low concentration uranium-bearing wastewater. CHEMOSPHERE 2021; 279:130810. [PMID: 34134431 DOI: 10.1016/j.chemosphere.2021.130810] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/17/2021] [Accepted: 05/03/2021] [Indexed: 06/12/2023]
Abstract
To improve the remediation efficiency of plants on low concentration uranium-bearing wastewater and clarify its strengthening mechanism, Syngonium podophyllum-Peperomia tetraphylla co-planting system was established, the enhanced effects of plants interaction on uranium removal were investigated, the chemical forms, valence states, and subcellular distribution of uranium in plants were confirmed, and the mechanisms of alleviating uranium stress by plants interaction were revealed. In Syngonium podophyllum-Peperomia tetraphylla co-planting system, the total amount of ethanol-extracted uranium and deionized water-extracted uranium with higher toxicity in their roots were reduced by 10.30% and 7.17%, respectively, which reduced the toxicity of uranium to plants. Plants interaction can inhibit the reduction of U(VI) in the root of Peperomia tetraphylla, which is conducive to the transport of uranium from roots to shoots. In addition, uranium in plants mainly existed in the cell wall (54.44%-66.52%) and the soluble fraction (23.85%-32.89%). These results indicated that Syngonium podophyllum and Peperomia tetraphylla co-planting can enhance their effects of uranium removal by alleviating uranium stress with the cell wall immobilization and vacuole compartmentation, improving biomass of plants, increasing bioaccumulation factor and translocation factor of uranium.
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Affiliation(s)
- Zhang Yue
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Ding Dexin
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Li Guangyue
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Yi Haitao
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Zhai Kaige
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Hu Nan
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Zhang Hui
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Dai Zhongran
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Ma Jianhong
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Li Feng
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Sun Jing
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China
| | - Wang Yongdong
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, PR China.
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14
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Banala UK, Indradyumna Das NP, Toleti SR. Uranium sequestration abilities of Bacillus bacterium isolated from an alkaline mining region. JOURNAL OF HAZARDOUS MATERIALS 2021; 411:125053. [PMID: 33453672 DOI: 10.1016/j.jhazmat.2021.125053] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 12/29/2020] [Accepted: 01/04/2021] [Indexed: 06/12/2023]
Abstract
The present study elaborates uranium sequestration by bacteria from alkaline wastewaters. In the investigation, a few bacterial strains were isolated from alkaline uranium mine water and were tested for uranium sequestration properties 16S rRNA analysis assigned the 10 bacterial isolates to 4 genera of Actinobacteria and Firmicutes. Among all the isolates tested, the strain Bacillus aryabhattai (TP03) has shown superior sequestration capacity at 5 and 10 mg/L U in 1 mM carbonate-bicarbonate buffer at pH 9.2. At low uranium concentrations (5 mg/L as uranyl carbonate), the strain could sequester ~70% of the uranium in 6 h with a loading capacity of 4.3 mg U/g dry bacterial biomass. Increase in carbonate-bicarbonate buffer concentrations and pH reduced the sequestration capacity. Scanning electron microscopy and energy dispersive X-ray fluorescence spectroscopy studies indicated the presence of uranium with the bacterial biomass. Fourier transform infra-red spectroscopy results confirmed the uranium sequestration by cell membrane phosphate, amide, and carboxyl functional groups. Transmission electron microscopy study showed uranium presence within the cell cytoplasm, thus supporting the hypothesis on active metabolism-dependent bioaccumulation of uranium. The kinetics study of uranium sequestration was well fitted to the pseudo-second-order model. Overall, this study infers that the isolated alkaliphilic bacteria from the mine waters have significant sequestration property for treating uranium-containing alkaline wastewaters.
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Affiliation(s)
- Uday Kumar Banala
- Radiological and Environmental Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India; Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
| | | | - Subba Rao Toleti
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India; Water and Steam Chemistry Division, Chemistry Group, Bhabha Atomic Research Centre, Kalpakkam 603102, India.
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15
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Enhancement of U(VI) biosorption by Trichoderma harzianum mutant obtained by a cold atmospheric plasma jet. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07615-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Kushwaha S, Mane M, Ravindranathan S, Das A. Polymer Nanorings with Uranium Specific Clefts for Selective Recovery of Uranium from Acidic Effluents via Reductive Adsorption. ACS Sens 2020; 5:3254-3263. [PMID: 32975114 DOI: 10.1021/acssensors.0c01684] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nanostructured polymeric materials, functionalized with an appropriate receptor, have opened up newer possibilities for designing a reagent that shows analyte-specific recognition and efficient scavenging of an analyte that has either a detrimental influence on human physiology and environment or on its recovery for further value addition. Higher active surface area, morphological diversity, synthetic tunability for desired surface functionalization, and the ease of regeneration of a nanostructured material for further use have provided such materials with a distinct edge over conventional reagents. The use of a biodegradable polymeric backbone has an added significance owing to the recent concern over the impact of polymers on the environment. Functionalization of biodegradable sodium alginate with AENA (6.85% grafting) as the receptor functionality led to a unique open framework nanoring (NNRG) morphology with a favorable spatial orientation for specific recognition and efficient binding to uranyl ions (U) in an aqueous medium over a varied pH range. Nanoring morphology was confirmed by transmission electron microscopy and atomic force microscopy images. The nanoscale design maximizes the surface area for the molecular scavenger. A combination of all these features along with the reversible binding phenomenon has made NNRG a superior reagent for specific, efficient uptake of UO22+ species from an acidic (pH 3-4) solution and compares better than all existing UO22+-scavengers reported till date. This could be utilized for the recovery of uranyl species from a synthetic acidic effluent of the nuclear power. The results of the U uptake experiments reveal a maximum adsorption capacity of 268 mg of U per g of NNRG in a synthetic nuclear effluent. X-ray photoelectron spectroscopy studies revealed a reductive complexation process and stabilization of U(IV)-species in adsorbed uranium species (U@NNRG).
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Affiliation(s)
- Shilpi Kushwaha
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
- Analytical and Environmental Sciences Division and Centralized Instrumentation Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
| | - Manoj Mane
- KAUST Catalysis Centre, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-900, Saudi Arabia
| | - Sapna Ravindranathan
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
- Central NMR Facility, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Amitava Das
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
- Department of Chemical Sciences, Indian Institute of Science and Education and Research Kolkata, Mohanpur 741246, West Bengal, India
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Yan H, Hu W, Cheng S, Xia H, Chen Q, Zhang L, Zhang Q. Microwave-assisted preparation of manganese dioxide modified activated carbon for adsorption of lead ions. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:170-184. [PMID: 32910801 DOI: 10.2166/wst.2020.350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this study, manganese dioxide was evenly distributed on the surface of activated carbon (AC), and the porous structure of AC and the surface functional groups of manganese dioxide were used to adsorb the heavy metal ion Pb(II). The advantages of microwave heating are fast heating and high selectivity. The mole ratio control of the AC and MnO2 in 1:0.1, microwave heating to 800 °C, heat preservation for 30 min. The maximum adsorption capacity of the MnO2-AC prepared by this method on Pb(II) can reach 664 mg/L at pH = 6. It can be observed by scanning electron microscope (SEM) that manganese dioxide particles are dispersed evenly on the surface and pore diameter of AC, and there is almost no agglomeration. The specific surface area was 752.8 m2/g, and the micropore area was 483.9 m2/g. The adsorption mechanism was explored through adsorption isotherm, adsorption kinetics, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). It is speculated that the adsorption mechanism includes electrostatic interaction and specific adsorption, indicating that lead ions enter into the void of manganese dioxide and form spherical complexes. The results showed that the adsorption behavior of Pb(II) by MnO2-AC was consistent with the Langmuir adsorption model, the quasi-second-order kinetic model, and the particle internal diffusion model.
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Affiliation(s)
- Heng Yan
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
| | - Wenhai Hu
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
| | - Song Cheng
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
| | - Hongying Xia
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
| | - Quan Chen
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
| | - Libo Zhang
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
| | - Qi Zhang
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China E-mail:
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18
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Wei H, Dong F, Chen M, Zhang W, He M, Liu M. Removal of uranium by biogenetic jarosite coupled with photoinduced reduction in the presence of oxalic acid: a low-cost remediation technology. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07125-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Li N, Yin M, Tsang DCW, Yang S, Liu J, Li X, Song G, Wang J. Mechanisms of U(VI) removal by biochar derived from Ficus microcarpa aerial root: A comparison between raw and modified biochar. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 697:134115. [PMID: 32380609 DOI: 10.1016/j.scitotenv.2019.134115] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 08/06/2019] [Accepted: 08/24/2019] [Indexed: 06/11/2023]
Abstract
Uranium (U) is a toxic and radioactive element. Excessive amounts of aqueous U(VI) generated from U mining, processing and nuclear industry may result in severe and irreversible damage to the environment. Herein, Ficus microcarpa aerial root (FMAR), a biowaste material, was used to adsorb U(VI) from aqueous solutions for the first time. Potassium permanganate (KMnO4)-modified FMAR biochar was synthesised, characterised and compared with raw (unmodified) biochar with respect to U(VI) adsorption. The results showed that the adsorption capability of the modified FMAR biochar was evidently higher than that of the raw biochar. Multiple characterisation techniques confirmed that the discrepancy was mainly due to the increased content of O-H and formation of irregular sheet-like nanostructure with the ultrafine MnO2 nanoparticles on the biochar surfaces after KMnO4 modification. The abundance of O-H and nanoscale MnO2 notably enhanced the adsorption of U(VI) by means of coordination and Lewis acid-base interaction. The results indicate that KMnO4-modified FMAR biochar has a good potential to serve as an environment-friendly adsorbent for the removal of U(VI) from solution.
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Affiliation(s)
- Nuo Li
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Institute of Environmental Research at Greater Bay, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Meiling Yin
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Institute of Environmental Research at Greater Bay, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Shitong Yang
- Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Juan Liu
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Institute of Environmental Research at Greater Bay, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
| | - Xue Li
- College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Gang Song
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Institute of Environmental Research at Greater Bay, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou 510006, China
| | - Jin Wang
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Institute of Environmental Research at Greater Bay, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou 510006, China.
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20
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Ma J, Zhao Q, Zhou L, Wen T, Wang J. Mutual effects of U(VI) and Eu(III) immobilization on interpenetrating 3-dimensional MnO 2/graphene oxide composites. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 695:133696. [PMID: 31421337 DOI: 10.1016/j.scitotenv.2019.133696] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 07/22/2019] [Accepted: 07/30/2019] [Indexed: 06/10/2023]
Abstract
Radioactive contamination poses grievous latent threat to biology together with ecological balance. It is of great significance to eliminate radionuclides from nuclear waste solution. Herein, interpenetrating 3-dimensional (3D) MnO2/GO composites (MGs) were rationally constructed by integrating α-crystal manganese dioxide (MnO2) nanowire with graphene oxide (GO) via a simple ultra-sonication process. Preliminary experiments showed that the MG composite with mass ratio of 1:2 (M1G2) was the optimal material with superior adsorption capacities for U(VI) (271.7 mg/g) and Eu(III) (83.5 mg/g) at pH ~5.0 (298 K), as compared with commercial GO and individual MnO2. Furthermore, M1G2 had high selectivity for U(VI) and Eu(III), which could remove >80% of target ions in the presence of NO3-, Cl-, CO32-, HCO3-, Mg2+, K+ or Na+ ions. It exhibited excellent stability under a wide range of pH 3-10 and great resistance to high ionic strength. More importantly, kinetic studies exhibited that M1G2 could efficiently capture target ions within ultra-short kinetic equilibrium time (<1 min). The interaction mechanism was clearly visualized by analyzing characterization data, showing that oxy-gen-containing functional groups took a major part for the binding of target ions. The excellent characteristics including the simple, fast and large-scale synthesis and the efficient performance endowed M1G2 with potential to remedy radioactive pollution in actual wastewater.
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Affiliation(s)
- Junping Ma
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Qiuyu Zhao
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Lvjun Zhou
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Tao Wen
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
| | - Jianjun Wang
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
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21
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Chen C, Hu J, Wang J. Uranium biosorption by immobilized active yeast cells entrapped in calcium-alginate-PVA- GO-crosslinked gel beads. RADIOCHIM ACTA 2019. [DOI: 10.1515/ract-2019-3150] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Abstract
A novel biosorbent, i. e. Saccharomyces cerevisiae entrapped in graphene oxide (GO), polyvinyl alcohol (PVA) and alginate and cross-linked in CaCl2- boric acid solution, was prepared, characterized and applied for U (VI) biosorption. The performance of U sorption and cations release (Na, K, Ca and Mg ions) was investigated under different contact time, initial uranium concentration and initial pH. Uranium sorption equilibrium basically achieved after 360 min. The kinetic data of U biosorption and Ca release were best described by the pseudo first-order equation. Both Langmuir and Freundlich models could fit the U sorption isotherm data. With increase of initial uranium (3.7 ~ 472.2 μmol/L) and sodium concentration (78.8 ~ 3911.7 μmol/L), the cations release ((Na + K)/2 + (Ca + Mg)) decreased from 116.9 to 30.1 μmol/g when the corresponding U sorption increased from 0.6 to 77.3 μmol/g. Initial solution pH at 3 was favorable for U sorption when pH ranged from 3 to 7. With increase of uranium concentration, ion exchange played a less role in U removal. The maximum U sorption capacity reached 142.1 μmol/g, calculated from the Langmuir model at initial pH 5. The O-containing functional group, such as carboxyl on the gel bead played an important role in U adsorption according to FTIR and XPS analysis. XPS analysis showed the existence of U (VI) and U (IV) on the surface of gel bead. Ion exchange, complexation and uranium reduction involved in uranium adsorption by the immobilized active dry yeast gel beads.
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Affiliation(s)
- Can Chen
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET , Tsinghua University , Beijing 100084 , P.R. China
| | - Jun Hu
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET , Tsinghua University , Beijing 100084 , P.R. China
| | - Jianlong Wang
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET , Tsinghua University , Beijing 100084 , P.R. China
- Beijing Key Laboratory of Radioactive Waste Treatment, Energy Science Building , Tsinghua University , Beijing 100084 , P.R. China
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22
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Mrudula MS, Tiwari N, Jha SN, Bhattacharyya D, Nair MRG. Structural studies on transition metal ion complexes of polyethylene oxide-natural rubber block copolymers. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1837-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Chao Z, Yin-Hua S, De-Xin D, Guang-Yue L, Yue-Ting C, Nan H, Hui Z, Zhong-Ran D, Feng L, Jing S, Yong-Dong W. Aspergillus niger changes the chemical form of uranium to decrease its biotoxicity, restricts its movement in plant and increase the growth of Syngonium podophyllum. CHEMOSPHERE 2019; 224:316-323. [PMID: 30826701 DOI: 10.1016/j.chemosphere.2019.01.098] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 01/02/2019] [Accepted: 01/16/2019] [Indexed: 06/09/2023]
Abstract
Aspergillus niger (A. niger) and Syngonium podophyllum (S. podophyllum) have been used for wastewater treatment, and have exhibited a promising application in recent years. To determine the effects of A. niger on uranium enrichment and uranium stress antagonism of S. podophyllum, the S. podophyllum-A. niger combined system was established, and hydroponic remediation experiments were carried out with uranium-containing wastewater. The results revealed that the bioaugmentation of A. niger could increase the biomass of S. podophyllum by 5-7%, reverse the process of U(VI) reduction induced by S. podophyllum, and increase the bioconcentration factor (BCF) and translocation factor (TF) of S. podophyllum to uranium by 35-41 and 0.01-0.06, respectively, thereby improving the reduction of uranium in wastewater. Moreover, A. niger could promote the cell wall immobilization and the subcellular compartmentalization of uranium in the root of S. podophyllum, reduce the phytotoxicity of uranium entering root cells, and inhibit the calcium efflux from root cells, thereby withdrawing the stress of uranium on S. podophyllum.
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Affiliation(s)
- Zou Chao
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Sha Yin-Hua
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Ding De-Xin
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Li Guang-Yue
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Cui Yue-Ting
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Hu Nan
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Zhang Hui
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Dai Zhong-Ran
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Li Feng
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Sun Jing
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China
| | - Wang Yong-Dong
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Heng Yang, 421001, Hunan, People's Republic of China.
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Zhang Z, Liu H, Song W, Ma W, Hu W, Chen T, Liu L. Accumulation of U(VI) on the Pantoea sp. TW18 isolated from radionuclide-contaminated soils. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2018; 192:219-226. [PMID: 29982006 DOI: 10.1016/j.jenvrad.2018.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 06/24/2018] [Accepted: 07/01/2018] [Indexed: 06/08/2023]
Abstract
Pantoea sp. TW18 isolated from radionuclide-contaminated soils was used for the bioremediation of radionuclides pollution. Accumulation mechanism of U(VI) on Pantoea sp. TW18 was investigated by batch experiments and characterization techniques. The batch experiments revealed that Pantoea sp. TW18 rapidly reached accumulation equilibrium at approximately 4 h with a high accumulation capacity (79.87 mg g-1 at pH 4.1 and T = 310 K) for U(VI). The accumulation data of U(VI) onto Pantoea sp. TW18 can be satisfactorily fitted by pseudo-second-order model. The accumulation of U(VI) on Pantoea sp. TW18 was affected by pH levels, not independent of ionic strength. Analysis of the FT-IR and XPS spectra demonstrated that accumulated U(VI) ions were primarily bound to nitrogen- and oxygen-containing functional groups (i.e., carboxyl, amide and phosphoryl groups) on the Pantoea sp. TW18 surface. This study showed that Pantoea sp. TW18 can be considered as a promising sorbent for remediation of radionuclides in environmental cleanup.
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Affiliation(s)
- Zexin Zhang
- School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China
| | - Haibo Liu
- School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China.
| | - Wencheng Song
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, 230031, Hefei, PR China.
| | - Wenjie Ma
- School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China
| | - Wei Hu
- School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China
| | - Tianhu Chen
- School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China
| | - Lei Liu
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, 230031, Hefei, PR China
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Ding L, Tan WF, Xie SB, Mumford K, Lv JW, Wang HQ, Fang Q, Zhang XW, Wu XY, Li M. Uranium adsorption and subsequent re-oxidation under aerobic conditions by Leifsonia sp. - Coated biochar as green trapping agent. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 242:778-787. [PMID: 30031311 DOI: 10.1016/j.envpol.2018.07.050] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 07/11/2018] [Accepted: 07/11/2018] [Indexed: 06/08/2023]
Abstract
It has generally been assumed that the immobilization of U(VI) via polyphosphate accumulating microorganisms may present a sink for uranium, but the potential mechanisms of the process and the stability of precipitated uranium under aerobic conditions remain elusive. This study seeks to explore the mechanism, capacity, and stability of uranium precipitation under aerobic conditions by a purified indigenous bacteria isolated from acidic tailings (pH 6.5) in China. The results show that over the treatment ranges investigated, maximum removal of U(VI) from aqueous solution was 99.82% when the initial concentration of U(VI) was 42 μM, pH was 3.5, and the temperature was with 30 °C much higher than that of other reported microorganisms. The adsorption mechanism was elucidated via the use of SEM-EDS, XPS and FTIR. SEM-EDS showed two peaks of uranium on the surface. A plausible explanation for this, supported by FTIR, is that uranium precipitated on the biosorbent surfaces. XPS measurements indicated that the uranium product is most likely a mixture of 13% U(VI) and 87% U(IV). Notably, the reoxidation experiment found that the uranium precipitates were stable in the presence of Ca2+ and Mg2+, however, U(IV) is oxidized to U(VI) in the presence of NO3- and Na+ ions, resulting in rapid dissolution. It implies that the synthesized Leifsonia sp. coated biochar could be utilized as a green and effective biosorbent. However, it may not a good choice for in-situ remediation due to the subsequent re-oxidation under aerobic conditions. These observations can be of some guiding significance to the application of the bioremediation technology in surface environments.
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Affiliation(s)
- Lei Ding
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Wen-Fa Tan
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China; Key Laboratory of Pollution Control and Resource Technology of Hunan Province, Hunan University, Hengyang 421001, China.
| | - Shui-Bo Xie
- Key Laboratory of Pollution Control and Resource Technology of Hunan Province, Hunan University, Hengyang 421001, China; Key Laboratory of Uranium Metallurgy and Biotechnology, University of South China, Hengyang 421001, China
| | - Kathryn Mumford
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Australia
| | - Jun-Wen Lv
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Hong-Qiang Wang
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Qi Fang
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiao-Wen Zhang
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiao-Yan Wu
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Mi Li
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
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Gładysz-Płaska A, Lipke A, Sternik D, Trytek M, Majdan M. Spectroscopic, thermal and equilibrium characterization of U(VI) ions sorption on inulin in the presence of phosphates. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.04.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Li A, Zhou C, Liu Z, Xu X, Zhou Y, Zhou D, Tang Y, Ma F, Rittmann BE. Direct solid-state evidence of H 2 -induced partial U(VI) reduction concomitant with adsorption by extracellular polymeric substances (EPS). Biotechnol Bioeng 2018; 115:1685-1693. [PMID: 29574765 DOI: 10.1002/bit.26592] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 03/08/2018] [Accepted: 03/15/2018] [Indexed: 11/05/2022]
Abstract
Adsorption of hexavalent uranium (U(VI)) by extracellular polymeric substances (EPS) has been studied, but the possibility of simultaneous U(VI) reduction mediated by EPS has not had experimental confirmation, as the reduction products have not yet been directly proven. Here, we reported the first direct evidence of lower-valent products of U(VI) immobilization by loosely associated EPS (laEPS) isolated from a fermenter strain of Klebsiella sp. J1 when the laEPS was exposed to H2 . During the 120-min tests for similarly 86% adsorption under O2 , N2 , and H2 , 8% more U was immobilized through a non-adsorptive pathway by the EPS for H2 than for N2 and O2 . A set of solid-state characterization tools (FT-IR, XPS, EELS, and TEM-EDX) confirmed partial reduction of U(VI) to lower-valence U, with the main reduced form being uraninite (UIV O2 ) nanoparticles, and the results reinforced the role of the reduction in accelerating U immobilization and shaping the characteristics of immobilized U in terms of valency, size, and crystallization. The laEPS, mostly comprised of carbohydrate and protein, contained non-cytochrome enzymes and electron carriers that could be responsible for electron transfer to U(VI). Taken together, our results directly confirm that EPS was able to mediate partial U(VI) reduction in the presence of H2 through non-cytochrome catalysis and that reduction enhanced overall U immobilization. Our study fills in some gaps of the microbe-mediated U cycle and will be useful to understand and control U removal in engineered reactors and in-situ bioremediation.
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Affiliation(s)
- Ang Li
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona.,State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China
| | - Chen Zhou
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona
| | - Zhuolin Liu
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona
| | - Xiaoyin Xu
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona.,State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, China
| | - Yun Zhou
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona.,State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, China
| | - Dandan Zhou
- School of Environment, Northeast Normal University, Changchun, China
| | - Youneng Tang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, Florida
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona
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28
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Shen Y, Zheng X, Wang X, Wang T. The biomineralization process of uranium(VI) by Saccharomyces cerevisiae - transformation from amorphous U(VI) to crystalline chernikovite. Appl Microbiol Biotechnol 2018; 102:4217-4229. [PMID: 29564524 DOI: 10.1007/s00253-018-8918-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 03/05/2018] [Accepted: 03/06/2018] [Indexed: 11/30/2022]
Abstract
Microorganisms play a significant role in uranium(VI) biogeochemistry and influence U(VI) transformation through biomineralization. In the present work, the process of uranium mineralization was investigated by Saccharomyces cerevisiae. The toxicity experiments showed that the viability of cell was not significantly affected by 100 mg L-1 U(VI) under 4 days of exposure time. The batch experiments showed that the phosphate concentration and pH value increased over time during U(VI) adsorption. Meanwhile, thermodynamic calculations demonstrated that the adsorption system was supersaturated with respect to UO2HPO4. The X-ray powder diffraction spectroscopy (XRD), field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) analyses indicated that the U(VI) was first attached onto the cell surface and reacted with hydroxyl, carboxyl, and phosphate groups through electrostatic interactions and complexation. As the immobilization of U(VI) transformed it from the ionic to the amorphous state, lamellar uranium precipitate was formed on the cell surface. With the prolongation of time, the amorphous uranium compound disappeared, and there were some crystalline substances observed extracellularly, which were well-characterized as tetragonal-chernikovite. Furthermore, the size of chernikovite was regulated at nano-level by cells, and the perfect crystal was formed finally. These findings provided an understanding of the non-reductive transformation process of U(VI) from the amorphous to crystalline state within microbe systems, which would be beneficial for the U(VI) treatment and reuse of nuclides and heavy metals.
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Affiliation(s)
- Yanghao Shen
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Xinyan Zheng
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoyu Wang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Tieshan Wang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China.
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29
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Wang P, Dong F, Wang X, Liu M, Nie X, Zhou L, Huo T, Zhang W, Wei H. Effects of riboflavin and AQS as electron shuttles on U(vi) reduction and precipitation byShewanella putrefaciens. RSC Adv 2018; 8:30692-30700. [PMID: 35548745 PMCID: PMC9085505 DOI: 10.1039/c8ra05715j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/19/2018] [Indexed: 11/21/2022] Open
Abstract
Understanding the mechanisms for electron shuttles (ESs) in microbial extracellular electron transfer (EET) is important in biogeochemical cycles, bioremediation applications, as well as bioenergy strategies.
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Affiliation(s)
- Pingping Wang
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Faqin Dong
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Xuhui Wang
- School of Life Science and Engineering
- Southwest University of Science and Technology
- Mianyang
- China
| | - Mingxue Liu
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Xiaoqin Nie
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Lei Zhou
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Tingting Huo
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Wei Zhang
- The Key Laboratory of Solid Waste Treatment and Resource
- Ministry of Education
- Southwest University of Science and Technology
- Mianyang
- China
| | - Hongfu Wei
- School of Life Science and Engineering
- Southwest University of Science and Technology
- Mianyang
- China
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30
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Zheng XY, Wang XY, Shen YH, Lu X, Wang TS. Biosorption and biomineralization of uranium(VI) by Saccharomyces cerevisiae-Crystal formation of chernikovite. CHEMOSPHERE 2017; 175:161-169. [PMID: 28211330 DOI: 10.1016/j.chemosphere.2017.02.035] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 01/24/2017] [Accepted: 02/05/2017] [Indexed: 06/06/2023]
Abstract
Biosorption of heavy metal elements including radionuclides by microorganisms is a promising and effective method for the remediation of the contaminated places. The responses of live Saccharomyces cerevisiae in the toxic uranium solutions during the biosorption process and the mechanism of uranium biomineralization by cells were investigated in the present study. A novel experimental phenomenon that uranium concentrations have negative correlation with pH values and positive correlation with phosphate concentrations in the supernatant was observed, indicating that hydrogen ions, phosphate ions and uranyl ions were involved in the chernikovite precipitation actively. During the biosorption process, live cells desorb deposited uranium within the equilibrium state of biosorption system was reached and the phosphorus concentration increased gradually in the supernatant. These metabolic detoxification behaviours could significantly alleviate uranium toxicity and protect the survival of the cells better in the environment. The results of microscopic and spectroscopic analysis demonstrated that the precipitate on the cell surface was a type of uranium-phosphate compound in the form of a scale-like substance, and S. cerevisiae could transform the uranium precipitate into crystalline state-tetragonal chernikovite [H2(UO2)2(PO4)2·8H2O].
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Affiliation(s)
- Xin-Yan Zheng
- School of Nuclear Science and Technology, Lanzhou University, No. 222, Tianshui South Road, Chengguan District, Lanzhou 730000, China.
| | - Xiao-Yu Wang
- School of Nuclear Science and Technology, Lanzhou University, No. 222, Tianshui South Road, Chengguan District, Lanzhou 730000, China.
| | - Yang-Hao Shen
- School of Nuclear Science and Technology, Lanzhou University, No. 222, Tianshui South Road, Chengguan District, Lanzhou 730000, China.
| | - Xia Lu
- School of Nuclear Science and Technology, Lanzhou University, No. 222, Tianshui South Road, Chengguan District, Lanzhou 730000, China.
| | - Tie-Shan Wang
- School of Nuclear Science and Technology, Lanzhou University, No. 222, Tianshui South Road, Chengguan District, Lanzhou 730000, China.
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31
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Li W, Troyer LD, Lee SS, Wu J, Kim C, Lafferty BJ, Catalano JG, Fortner JD. Engineering Nanoscale Iron Oxides for Uranyl Sorption and Separation: Optimization of Particle Core Size and Bilayer Surface Coatings. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13163-13172. [PMID: 28338312 DOI: 10.1021/acsami.7b01042] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Herein, we describe engineered superparamagnetic iron oxide nanoparticles (IONPs) as platform materials for enhanced uranyl (UO22+) sorption and separation processes under environmentally relevant conditions. Specifically, monodispersed 8-25 nm iron oxide (magnetite, Fe3O4) nanoparticles with tailored organic acid bilayered coatings have been systematically evaluated and optimized to bind, and thus remove, uranium from water. The combined nonhydrolytic synthesis and bilayer phase transfer material preparation methods yield highly uniform and surface tailorable IONPs, which allow for direct evaluation of the size-dependent and coating-dependent sorption capacities of IONPs. Optimized materials demonstrate ultrahigh sorption capacities (>50% by wt/wt) at pH 5.6 for 8 nm oleic acid (OA) bilayer and sodium monododecyl phosphate (SDP) surface-stabilized IONPs. Synchrotron-based X-ray absorption spectroscopy shows that iron oxide core particle size and stabilizing surface functional group(s) substantially affect U(VI)-removal mechanisms, specifically the ratio of uptake via adsorption versus reduction to U(IV). Taken together, tunable size and surface functionality, high colloidal stability, and favorable affinity toward uranium provide distinct synergistic advantage(s) for the application of bilayered IONPs as part of the next-generation material-based uranium recovery, remediation, and sensing technologies.
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Affiliation(s)
| | | | | | | | | | - Brandon J Lafferty
- U.S. Army Corps of Engineers, Engineer Research and Development Center , Vicksburg, Mississippi 39180, United States
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32
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Li X, Ding C, Liao J, Du L, Sun Q, Yang J, Yang Y, Zhang D, Tang J, Liu N. Microbial reduction of uranium (VI) by Bacillus sp. dwc-2: A macroscopic and spectroscopic study. J Environ Sci (China) 2017; 53:9-15. [PMID: 28372765 DOI: 10.1016/j.jes.2016.01.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 01/01/2016] [Accepted: 01/05/2016] [Indexed: 06/07/2023]
Abstract
The microbial reduction of U(VI) by Bacillus sp. dwc-2, isolated from soil in Southwest China, was explored using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge spectroscopy (XANES). Our studies indicated that approximately 16.0% of U(VI) at an initial concentration of 100mg/L uranium nitrate could be reduced by Bacillus sp. dwc-2 at pH8.2 under anaerobic conditions at room temperature. Additionally, natural organic matter (NOM) played an important role in enhancing the bioreduction of U(VI) by Bacillus sp. dwc-2. XPS results demonstrated that the uranium presented mixed valence states (U(VI) and U(IV)) after bioreduction, which was subsequently confirmed by XANES. Furthermore, the TEM and high resolution transmission electron microscopy (HRTEM) analysis suggested that the reduced uranium was bioaccumulated mainly within the cell and as a crystalline structure on the cell wall. These observations implied that the reduction of uranium may have a significant effect on its fate in the soil environment in which these bacterial strains occur.
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Affiliation(s)
- Xiaolong Li
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China; Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China.
| | - Congcong Ding
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China; Key Laboratory of Biological Resource and Ecological Environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Jiali Liao
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Liang Du
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
| | - Qun Sun
- Key Laboratory of Biological Resource and Ecological Environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Jijun Yang
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Yuanyou Yang
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Dong Zhang
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
| | - Jun Tang
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Ning Liu
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
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33
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Yi ZJ, Yao J, Zhu MJ, Chen HL, Wang F, Liu X. Uranium biosorption from aqueous solution by the submerged aquatic plant Hydrilla verticillata. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:1332-1341. [PMID: 28333049 DOI: 10.2166/wst.2016.592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The biosorption characteristics of U(VI) from aqueous solution onto a nonliving aquatic macrophyte, Hydrilla verticillata (dry powder), were investigated under various experimental conditions by using batch methods. Results showed that the adsorption reached equilibrium within 60 min and the experimental data were well fitted by the pseudo-first-order kinetic model. U(VI) adsorption was strongly pH dependent, and the optimum pH for U(VI) removal was 5.5. Isotherm adsorption data displayed good correlation with the Langmuir model, with a maximum monolayer adsorption capacity of 171.52 mg/g. Thermodynamic studies suggested that U(VI) adsorption onto H. verticillata was an exothermic and spontaneous process in nature. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy indicated that the amino and hydroxyl groups on the algal surface played an important role in U(VI) adsorption. The mechanisms responsible for U(VI) adsorption could involve electrostatic attraction and ion exchange. In conclusion, H. verticillata biomass showed good potential as an adsorption material for the removal of uranium contaminants in aqueous solution.
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Affiliation(s)
- Zheng-Ji Yi
- School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China E-mail: ; Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
| | - Jun Yao
- School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China E-mail:
| | - Mi-Jia Zhu
- School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China E-mail:
| | - Hui-Lun Chen
- School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China E-mail:
| | - Fei Wang
- School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China E-mail:
| | - Xing Liu
- Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
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34
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Fan F, Pan D, Wu H, Zhang T, Wu W. Succinamic Acid Grafted Nanosilica for the Preconcentration of U(VI) from Aqueous Solution. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04652] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fuyou Fan
- Radiochemistry
Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Institute
of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Duoqiang Pan
- Radiochemistry
Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou 730000, China
| | - Hanyu Wu
- Radiochemistry
Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou 730000, China
| | - Tianjiao Zhang
- The
Second Medical College, Lanzhou University, Lanzhou 730000, China
| | - Wangsuo Wu
- Radiochemistry
Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou 730000, China
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35
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Wan Z, Wang J. Degradation of sulfamethazine using Fe 3O 4-Mn 3O 4/reduced graphene oxide hybrid as Fenton-like catalyst. JOURNAL OF HAZARDOUS MATERIALS 2017; 324:653-664. [PMID: 27866761 DOI: 10.1016/j.jhazmat.2016.11.039] [Citation(s) in RCA: 189] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 11/10/2016] [Accepted: 11/14/2016] [Indexed: 05/29/2023]
Abstract
In this paper, Fe3O4-Mn3O4/reduced graphene oxide (RGO) hybrid was synthesized through polyol process and impregnation method and used as heterogeneous Fenton-like catalyst for degradation of sulfamethazine (SMT) in aqueous solution. The hybrid catalyst had higher catalytic efficiency compared with Fe3O4-Mn3O4 and Mn3O4 as catalyst for degradation of SMT. The effects of pH value, H2O2 concentration, catalyst dosage, initial SMT concentration and temperature on SMT degradation were investigated. The removal efficiency of SMT was about 98% at following optimal conditions: pH=3, T=35°C, Fe3O4/Mn3O4-RGO composites=0.5g/L, H2O2=6mM. The inhibitor experiments indicated that the main active species was hydroxyl radicals (·OH) on catalyst surface. At last, the possible catalytic mechanism was proposed.
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Affiliation(s)
- Zhong Wan
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China.
| | - Jianlong Wang
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing 100084, PR China.
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36
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Wang T, Zheng X, Wang X, Lu X, Shen Y. Different biosorption mechanisms of Uranium(VI) by live and heat-killed Saccharomyces cerevisiae under environmentally relevant conditions. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2017; 167:92-99. [PMID: 27913083 DOI: 10.1016/j.jenvrad.2016.11.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Revised: 11/14/2016] [Accepted: 11/16/2016] [Indexed: 06/06/2023]
Abstract
Uranium adsorption mechanisms of live and heat-killed Saccharomyces cerevisiae in different pH values and biomass concentrations were studied under environmentally relevant conditions. Compared with live cells, the adsorption capacity of heat-killed cells is almost one order of magnitude higher in low biomass concentration and highly acidic pH conditions. To explore the mesoscopic surface interactions between uranium and cells, the characteristic of uranium deposition was investigated by SEM-EDX, XPS and FTIR. Biosorption process of live cells was considered to be metabolism-dependent. Under stimulation by uranyl ions, live cells could gradually release phosphorus and reduce uranium from U(VI) to U(IV) to alleviate uranium toxicity. The uranyl-phosphate complexes were formed in scale-like shapes on cell surface. The metabolic detoxification mechanisms such as reduction and "self-protection" are of significance to the migration of radionuclides. In the metabolism-independent biosorption process of heat-killed cells: the cells cytomembrane was damaged by autoclaving which led to the free diffusion of phosphorous from intracellular, and the rough surface and nano-holes indicated that the dead cells provided larger contact area to precipitate U(VI) as spherical nano-particles. The high biosorption capacity of heat-killed cells makes it become a suitable biological adsorbent for uranium removal.
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Affiliation(s)
- Tieshan Wang
- School of Nuclear Science and Technology, Lanzhou University, NO.222, Tianshui South Road, Chengguan District, Lanzhou 730000, China
| | - Xinyan Zheng
- School of Nuclear Science and Technology, Lanzhou University, NO.222, Tianshui South Road, Chengguan District, Lanzhou 730000, China.
| | - Xiaoyu Wang
- School of Nuclear Science and Technology, Lanzhou University, NO.222, Tianshui South Road, Chengguan District, Lanzhou 730000, China
| | - Xia Lu
- School of Nuclear Science and Technology, Lanzhou University, NO.222, Tianshui South Road, Chengguan District, Lanzhou 730000, China
| | - Yanghao Shen
- School of Nuclear Science and Technology, Lanzhou University, NO.222, Tianshui South Road, Chengguan District, Lanzhou 730000, China
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37
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Wan Z, Wang J. Ce-Fe-reduced graphene oxide nanocomposite as an efficient catalyst for sulfamethazine degradation in aqueous solution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:18542-18551. [PMID: 27294699 DOI: 10.1007/s11356-016-7051-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 06/07/2016] [Indexed: 06/06/2023]
Abstract
A heterogeneous Fenton catalyst Ce(0)-Fe(0)-reduced graphene oxide (Ce-Fe-RGO) was synthesized with chemical reduction methods and used for degradation of sulfamethazine. The introduction of Ce and graphene increased the dispersibility of iron particles which was confirmed by SEM and TEM. The results of VSM analysis showed good magnetism of Ce-Fe-RGO. The catalyst performance was compared with other kinds of catalysts (Fe(0) and Ce(0)-Fe(0)) for degradation of sulfamethazine. The results showed that Ce(0)-Fe-RGO had good catalytic performance and adsorption. X-ray diffraction showed the change of iron oxide on catalyst surface after use. The total sulfur (TS), total nitrogen (TN), total organic carbon (TOC), and intermediates, such as small organic molecular and anion ions, were analyzed by IC under different pH conditions. Finally, the possible catalytic mechanism was tentatively proposed based on inhibitor experimental results and XPS characterization. The main active species was hydroxyl radical on catalyst surface and the transition between Ce(3+) and Ce(4+) which enhanced the reduction from Fe(3+) to Fe(2+) and formation of ·OH and ·O2 (-).
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Affiliation(s)
- Zhong Wan
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, China
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing, 100084, China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, China.
- Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing, 100084, China.
- Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, China.
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38
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Pan N, Li L, Ding J, Li S, Wang R, Jin Y, Wang X, Xia C. Preparation of graphene oxide-manganese dioxide for highly efficient adsorption and separation of Th(IV)/U(VI). JOURNAL OF HAZARDOUS MATERIALS 2016; 309:107-115. [PMID: 26878706 DOI: 10.1016/j.jhazmat.2016.02.012] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 01/30/2016] [Accepted: 02/04/2016] [Indexed: 06/05/2023]
Abstract
Manganese dioxide decorated graphene oxide (GOM) was prepared via fixation of crystallographic MnO2 (α, γ) on the surface of graphene oxide (GO) and was explored as an adsorbent material for simultaneous removal of thorium/uranium ions from aqueous solutions. In single component systems (Th(IV) or U(VI)), the α-GOM2 (the weight ratio of GO/α-MnO2 of 2) exhibited higher maximum adsorption capacities toward both Th(IV) (497.5mg/g) and U(VI) (185.2 mg/g) than those of GO. In the binary component system (Th(IV)/U(VI)), the saturated adsorption capacity of Th(IV) (408.8 mg/g)/U(VI) (66.8 mg/g) on α-GOM2 was also higher than those on GO. Based on the analysis of various data, it was proposed that the adsorption process may involve four types of molecular interactions including coordination, electrostatic interaction, cation-pi interaction, and Lewis acid-base interaction between Th(IV)/U(VI) and α-GOM2. Finally, the Th(IV)/U(VI) ions on α-GOM2 can be separated by a two-stage desorption process with Na2CO3/EDTA. Those results displayed that the α-GOM2 may be utilized as an potential adsorbent for removing and separating Th(IV)/U(VI) ions from aqueous solutions.
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Affiliation(s)
- Ning Pan
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Long Li
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jie Ding
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Shengke Li
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau SAR, China
| | - Ruibing Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau SAR, China.
| | - Yongdong Jin
- College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Xiangke Wang
- School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, China
| | - Chuanqin Xia
- College of Chemistry, Sichuan University, Chengdu 610064, China; Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
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Li X, Ding C, Liao J, Du L, Sun Q, Yang J, Yang Y, Zhang D, Tang J, Liu N. Bioaccumulation characterization of uranium by a novel Streptomyces sporoverrucosus dwc-3. J Environ Sci (China) 2016; 41:162-171. [PMID: 26969062 DOI: 10.1016/j.jes.2015.06.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 04/01/2015] [Accepted: 06/23/2015] [Indexed: 06/05/2023]
Abstract
The biosorption mechanisms of uranium on an aerobic bacterial strain Streptomyces sporoverrucosus dwc-3, isolated from a potential disposal site for (ultra-)low uraniferous radioactive waste in Southwest China, were evaluated by using transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), proton induced X-ray emission (PIXE) and enhanced proton backscattering spectrometry (EPBS). Approximately 60% of total uranium at an initial concentration of 10mg/L uranium nitrate solution could be absorbed on 100mg S. sporoverrucosus dwc-3 with an adsorption capacity of more than 3.0mg/g (wet weight) after 12hr at room temperature at pH3.0. The dynamic biosorption process of S. sporoverrucosus dwc-3 for uranyl ions was well described by a pseudo second-order model. S. sporoverrucosus dwc-3 could accumulate uranium on cell walls and within the cell, as revealed by SEM and TEM analysis as well as EDX spectra. XPS and FT-IR analysis further suggested that the absorbed uranium was bound to amino, phosphate and carboxyl groups of the cells. Additionally, PIXE and EPBS results confirmed that ion exchange also contributed to the adsorption process of uranium.
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Affiliation(s)
- Xiaolong Li
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Congcong Ding
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China; Key Laboratory of Biological Resource and Ecological Environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Jiali Liao
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Liang Du
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
| | - Qun Sun
- Key Laboratory of Biological Resource and Ecological Environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Jijun Yang
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Yuanyou Yang
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Dong Zhang
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
| | - Jun Tang
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Ning Liu
- Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
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Nie X, Dong F, Liu M, Sun S, Yang G, Zhang W, Qin Y, Ma J, Huang R, Gong J. Removel of Uranium from Aqueous Solutions by Spirodela Punctata as the Mechanism of Biomineralization. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.proenv.2016.02.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Hufton J, Harding JH, Romero-González ME. The role of extracellular DNA in uranium precipitation and biomineralisation. Phys Chem Chem Phys 2016; 18:29101-29112. [DOI: 10.1039/c6cp03239g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The reaction mechanism for the formation of uranyl–eDNA precipitates was determined as a phosphate mediated process.
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Affiliation(s)
- Joseph Hufton
- Department of Geography
- The University of Sheffield
- Sheffield
- UK
| | - John H. Harding
- Department of Materials Science and Engineering
- Sir Robert Hadfield Building
- University of Sheffield
- Sheffield
- UK
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Vázquez-Campos X, Kinsela AS, Collins RN, Neilan BA, Aoyagi N, Waite TD. Uranium Binding Mechanisms of the Acid-Tolerant Fungus Coniochaeta fodinicola. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:8487-8496. [PMID: 26106944 DOI: 10.1021/acs.est.5b01342] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The uptake and binding of uranium [as (UO2)(2+)] by a moderately acidophilic fungus, Coniochaeta fodinicola, recently isolated from a uranium mine site, is examined in this work in order to better understand the potential impact of organisms such as this on uranium sequestration in hydrometallurgical systems. Our results show that the viability of the fungal biomass is critical to their capacity to remove uranium from solution. Indeed, live biomass (viable cells based on vital staining) were capable of removing ∼16 mg U/g dry weight in contrast with dead biomass (autoclaved) which removed ∼45 mg U/g dry weight after 2 h. Furthermore, the uranium binds with different strength, with a fraction ranging from ∼20-50% being easily leached from the exposed biomass by a 10 min acid wash. Results from X-ray absorption spectroscopy measurements show that the strength of uranium binding is strongly influenced by cell viability, with live cells showing a more well-ordered uranium bonding environment, while the distance to carbon or phosphorus second neighbors is similar in all samples. When coupled with time-resolved laser fluorescence and Fourier transformed infrared measurements, the importance of organic acids, phosphates, and polysaccharides, likely released with fungal cell death, appear to be the primary determinants of uranium binding in this system. These results provide an important progression to our understanding with regard to uranium sequestration in hydrometallurgical applications with implications to the unwanted retention of uranium in biofilms and/or its mobility in a remediation context.
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Affiliation(s)
| | | | | | | | - Noboru Aoyagi
- ∥Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki 319-1184, Japan
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Natrajan LS, Swinburne AN, Andrews MB, Randall S, Heath SL. Redox and environmentally relevant aspects of actinide(IV) coordination chemistry. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.12.021] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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45
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Kushwaha S, Sudhakar PP. Sorption of uranium from aqueous solutions using palm-shell-based adsorbents: a kinetic and equilibrium study. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2013; 126:115-124. [PMID: 23978485 DOI: 10.1016/j.jenvrad.2013.07.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 01/15/2013] [Accepted: 07/31/2013] [Indexed: 06/02/2023]
Abstract
In this study adsorbents based on palm shell powder as well as modified and activated palm shell powder were studied to analyze their behavior in sorbing U(6+) by both batch and fixed column modes. Seven different two-parameter isotherm models were applied to the experimental data to predict the sorption isotherms. The ΔG(0) values from Langmuir and thermodynamic calculations indicate physisorption as the major mechanism for adsorption of uranium. Usefulness of various kinetic models like pseudo first order, pseudo second order, intraparticle diffusion, Bangham, Elovich and Liquid film diffusion were tested. The adsorption capacities were found to be greater than 200 mg/g for all the adsorbents under study. The column data were fitted by Thomas, Yoon and Nelson as well as Wolborska models. The Thomas and Yoon and Nelson models were best to fit the breakthrough curves under the experimental conditions studied.
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Affiliation(s)
- Shilpi Kushwaha
- Department of Chemistry, The M. S. University of Baroda, Vadodara 390002, India
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