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Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric

《环境科学与工程前沿(英文)》 2023年 第17卷 第9期 doi: 10.1007/s11783-023-1707-z

摘要:

● EPS immobilizes U(VI) via adsorption, bioreduction and desorption.

关键词: Adsorption     Bioreduction     Desorption     Kinetics     Isotherm     Uranium    

Microbial communities biostimulated by ethanol during uranium (VI) bioremediation in contaminated sediment

Mary Beth LEIGH,Wei-Min WU,Erick CARDENAS,Ondrej UHLIK,Sue CARROLL,Terry GENTRY,Terence L. MARSH,Jizhong ZHOU,Philip JARDINE,Craig S. CRIDDLE,James M. TIEDJE

《环境科学与工程前沿(英文)》 2015年 第9卷 第3期   页码 453-464 doi: 10.1007/s11783-014-0721-6

摘要: Stable isotope probing (SIP) was used to identify microbes stimulated by ethanol addition in microcosms containing two sediments collected from the bioremediation test zone at the US Department of Energy Oak Ridge site, TN, USA. One sample was highly bioreduced with ethanol while another was less reduced. Microcosms with the respective sediments were amended with C labeled ethanol and incubated for 7 days for SIP. Ethanol was rapidly converted to acetate within 24 h accompanied with the reduction of nitrate and sulfate. The accumulation of acetate persisted beyond the 7 d period. Aqueous U did not decline in the microcosm with the reduced sediment due to desorption of U but continuously declined in the less reduced sample. Microbial growth and concomitant C-DNA production was detected when ethanol was exhausted and abundant acetate had accumulated in both microcosms. This coincided with U(VI) reduction in the less reduced sample. C originating from ethanol was ultimately utilized for growth, either directly or indirectly, by the dominant microbial community members within 7 days of incubation. The microbial community was comprised predominantly of known denitrifiers, sulfate-reducing bacteria and iron (III) reducing bacteria including , , , and others, including the known U(VI)-reducing bacteria A , and The findings suggest that ethanol biostimulates the U(VI)-reducing microbial community by first serving as an electron donor for nitrate, sulfate, iron (III) and U(VI) reduction, and acetate which then functions as electron donor for U(VI) reduction and carbon source for microbial growth.

关键词: Stable isotope probing (SIP)     ethanol     acetate     uranium reduction     sediment     bioremediation    

吸附法处理低浓度含铀废水的研究进展

高军凯,顾平,张光辉,高鑫,侯立安

《中国工程科学》 2014年 第16卷 第7期   页码 73-78

摘要:

本文简要介绍了铀的危害及其在水溶液中的存在形态,综述了吸附法处理低浓度含铀废水的最新研究进展,分析了不同吸附技术的特点,评论了它们的吸附性能和应用前景,并对进一步的研究方向提出了一些看法。

关键词: 放射性废水         吸附     零价铁    

我国铀资源勘查状况及发展前景

张金带,李友良,简晓飞

《中国工程科学》 2008年 第10卷 第1期   页码 54-60

摘要:

概略介绍了我国铀矿地质勘查简史及已探明的铀资源的总体状况,分析了我国铀矿资源“矿床数量多、矿石性能好、产出较集中”的特征,认为有自身的特点和优势,并针对我国国土铀资源勘查程度较低的实际,指出:要提高国内天然铀的保障程度,必须从现在开始加大勘查投入力度,尽快发现和探明一批大中型铀矿产地,阐述了我国50多年来在铀资源勘查中取得的主要科技成就;根据我国铀矿勘查、科研能力和丰富的铀资源潜力,提出了实施“立足国内”与“开拓国外”相结合的铀资源勘查战略,以确保满足我国核工业对铀资源的需求。

关键词: 铀资源     勘查     潜力     前景    

Oxidative leaching kinetics of molybdenum-uranium ore in H

T. A. Lasheen, M. E. El-Ahmady, H. B. Hassib, A. S. Helal

《化学科学与工程前沿(英文)》 2013年 第7卷 第1期   页码 95-102 doi: 10.1007/s11705-013-1317-6

摘要: The processing of molybdenum-uranium ore in a sulfuric acid solution using hydrogen peroxide as an oxidant has been investigated. The leaching temperature, hydrogen peroxide concentration, sulfuric acid concentration, leaching time, particle size, liquid-to-solid ratio and agitation speed all have significant effects on the process. The optimum process operating parameters were: temperature: 95°C; H O concentration: 0.5 M; sulfuric acid concentration: 2.5 M; time: 2 h; particle size: 74 μm, liquid-to-solid ratio: 14 ∶ 1 and agitation speed: 600 rpm. Under these experimental conditions, the extraction efficiency of molybdenum was about 98.4%, and the uranium extraction efficiency was about 98.7%. The leaching kinetics of molybdenum showed that the reaction rate of the leaching process is controlled by the chemical reaction at the particle surface. The leaching process follows the kinetic model 1 ? (1? ) = with an apparent activation energy of 40.40 kJ/mole. The temperature, concentrations of H O and H SO and the mesh size are the main factors that influence the leaching rate. The reaction order in H SO was 1.0012 and in H O it was 1.2544.

关键词: leaching of molybdenum     leaching of uranium     kinetics    

Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from

Xuewen Hu, Yun Wang, Jinbo Ou Yang,Yang Li, Peng Wu, Hengju Zhang, Dingzhong Yuan, Yan Liu, Zhenyu Wu, Zhirong Liu

《化学科学与工程前沿(英文)》 2020年 第14卷 第6期   页码 1029-1038 doi: 10.1007/s11705-019-1898-9

Comparison between two commercial uranium resins and a uranyl sulphate imprinted resin based on self-assembling

LIU Yaochi, XU Wei, XU Weijian, LIU Hanmao, ZHANG Xiaowen

《化学科学与工程前沿(英文)》 2007年 第1卷 第4期   页码 327-331 doi: 10.1007/s11705-007-0059-8

摘要: In recent years, resins prepared via molecular imprinting technology have received considerable attention owing to their recognition and selective adsorption. This paper deals with the comparative investigation between a uranyl sulphate imprinted ion-exchange based on self-assembling molecular imprinting technology and two kinds of commercial uranium resins (the medium pore resin D263 and strong base resin 201×7). The studies were focused on their kinetics performance, adaptability toward pH, and performance of saturation and elution in laboratory-scale column. The results show that the imprinted ion exchange resin has the fast kinetics, high adaptability toward pH, and good adsorption and elution performance.

关键词: saturation     molecular imprinting     imprinting technology     adaptability     commercial    

铀钚金属表面抗腐蚀性研究进展

傅依备,汪小琳,朱正如

《中国工程科学》 2000年 第2卷 第12期   页码 59-65

摘要:

金属铀钚表面的腐蚀与防腐蚀一直受到关注,文章综述了自1994年来作者实验室在铀钚金属表面抗腐蚀性方面的研究进展。用X射线光电子能谱(XPS)、气相色谱(GC)等方法系统地分析研究了金属铀和U3O8与CO、CO2、H2等气体的相容性及其表面化学行为,铀试样在CO气氛中的贮存氧化增重及δ-Pu金属和铀试样在该气氛贮存期气相组成变化;应用改进的量子力学计算方法对金属铀钚化合物的分子结构、势能函数、光谱性质、热力学性质和动力学性质进行了系统研究;应用热力学平衡原理方法研究了铀和钚在还原气氛中的表面化学反应。通过实验与理论结合的系统研究,揭示了铀与上述气体介质相互作用的规律,得到一系列具有实际应用和理论意义的实验研究和理论计算结果,为进一步深化铀钚金属抗腐蚀研究奠定了基础。研究结果表明CO的存在有利于抑制铀钚金属的表面氧化腐蚀。

关键词:         表面化学     相对论有效原子实势(RECP)    

中国铀矿采冶技术发展与展望

阙为民,王海峰,牛玉清,张飞凤,谷万成

《中国工程科学》 2008年 第10卷 第3期   页码 44-53

摘要:

对中国铀矿采冶工业的发展作了全面的回顾,重点介绍了中国铀矿地浸、堆浸、原地爆破浸出技术的研究进展与应用水平;在对中国铀矿采冶形势和存在的问题分析的基础上,结合矿床资源的特点,指出了中国铀矿采冶技术发展的方向。21世纪中国铀矿冶工业面临新的发展机遇和挑战,只有开发新的采、选、冶技术,提高铀资源的利用水平,减少铀矿采冶对环境的影响,才能实现铀矿冶的可持续发展和经济与环境的协调发展。

关键词: 铀矿开采     地浸     堆浸     提取     纯化     发展    

Electrocatalytic reduction of NO to NH in ionic liquids by P-doped TiO nanotubes

《化学科学与工程前沿(英文)》 2023年 第17卷 第6期   页码 726-734 doi: 10.1007/s11705-022-2274-8

摘要: Designing advanced and cost-effective electrocatalytic system for nitric oxide (NO) reduction reaction (NORR) is vital for sustainable NH3 production and NO removal, yet it is a challenging task. Herein, it is shown that phosphorus (P)-doped titania (TiO2) nanotubes can be adopted as highly efficient catalyst for NORR. The catalyst demonstrates impressive performance in ionic liquid (IL)-based electrolyte with a remarkable high Faradaic efficiency of 89% and NH3 yield rate of 425 μg·h−1·mgcat.−1, being close to the best-reported results. Noteworthy, the obtained performance metrics are significantly larger than those for N2 reduction reaction. It also shows good durability with negligible activity decay even after 10 cycles. Theoretical simulations reveal that the introduction of P dopants tunes the electronic structure of Ti active sites, thereby enhancing the NO adsorption and facilitating the desorption of *NH3. Moreover, the utilization of IL further suppresses the competitive hydrogen evolution reaction. This study highlights the advantage of the catalyst−electrolyte engineering strategy for producing NH3 at a high efficiency and rate.

关键词: nitric oxide reduction reaction     electrcatalysis     ammonia production     phosphorus-doped titania    

中国核电的可持续发展

赵仁恺

《中国工程科学》 2000年 第2卷 第10期   页码 33-41

摘要:

文章阐述了核能是可持续发展的能源,是我国未来国民经济发展的重要支柱的论点,分析了国际核电发展现状,我国核电发展的方针政策、技术路线、现状以及共同关心的几个问题:铀资源问题、核安全问题、核废料问题和核电国产化问题,展望了我国核电发展的前景,并提出了建议:我国核电站应以现有压水堆核电站为基础,实现国产化、标准化、系列化;快中子增殖堆在我国核电建设中占有十分重要的地位,应大力支持、促进;尽快开始乏燃料后处理厂及其配套设施的建设。

关键词: 核能     铀资源     核安全     核废料     国产化    

Enhancement of extracellular Cr(VI) reduction for anammox recovery using hydrazine: performance, pathways

《环境科学与工程前沿(英文)》 2023年 第17卷 第9期 doi: 10.1007/s11783-023-1715-z

摘要:

● N2H4 addition enhanced and recovered anammox performance under Cr(VI) stress.

关键词: Extracellular Cr(VI) reduction     Electron transfer     Anammox     Hydrazine     Cr(VI) inhibition    

Achieving air pollutant emission reduction targets with minimum abatement costs: An enterprise-level

《环境科学与工程前沿(英文)》 2022年 第16卷 第2期 doi: 10.1007/s11783-021-1459-6

摘要:

• Quantification of efficiency and fairness of abatement allocation are optimized.

关键词: Pollutant emission reduction allocation     Emission reduction measures     Total abatement cost     Economic efficiency     Abatement space    

Stress-related ecophysiology of members of the genus

Om Prakash, Stefan J. Green, Pooja Singh, Puja Jasrotia, Joel E. Kostka

《环境科学与工程前沿(英文)》 2021年 第15卷 第2期 doi: 10.1007/s11783-020-1315-0

摘要: Abstract • Rhodanobacter spp. are dominant in acidic, high nitrate and metal contaminated sites. • Dominance of Rhodanobacter is likely due to tolerance to low pH and heavy metals. • High organic content increases stress tolerance capacity. • Longer incubation time is critical for accurate assessment of MIC (various stresses). This work examines the physiologic basis of stress tolerance in bacterial strains of the genus Rhodanobacter that dominate in the acidic and highly metal contaminated near-source subsurface zone of the Oak Ridge Integrated Field Research Challenge (ORIFRC) site. Tolerance of R. denitrificans to levels of different stresses were studied in synthetic groundwater medium and R2A broth. Two strains of R. denitrificans, strains 2APBS1T and 116-2, tolerate low to circumneutral pH (4–8), high Uranium (1 mmol/L), elevated levels of nitrate (400 mmol/L) and high NaCl (2.5%). A combination of physiologic traits, such as growth at low pH, increased growth in the presence of high organics concentration, and tolerance of high concentrations of nitrate, NaCl and heavy metals is likely responsible for dominance of Rhodanobacter at the ORIFRC site. Furthermore, extended incubation times and use of low carbon media, better approximating site groundwater conditions, are critical for accurate determination of stress responses. This study expands knowledge of the ecophysiology of bacteria from the genus Rhodanobacter and identifies methodological approaches necessary for acquiring accurate tolerance data.

关键词: Rhodanobacter     Uranium     Nitrate     Metals     Stress tolerance    

Recent advances and challenges of nitrogen/nitrate electro catalytic reduction to ammonia synthesis

《能源前沿(英文)》 doi: 10.1007/s11708-023-0908-2

摘要: The Haber-Bosch process is the most widely used synthetic ammonia technology at present. Since its invention, it has provided an important guarantee for global food security. However, the traditional Haber-Bosch ammonia synthesis process consumes a lot of energy and causes serious environmental pollution. Under the serious pressure of energy and environment, a green, clean, and sustainable ammonia synthesis route is urgently needed. Electrochemical synthesis of ammonia is a green and mild new method for preparing ammonia, which can directly convert nitrogen or nitrate into ammonia using electricity driven by solar, wind, or water energy, without greenhouse gas and toxic gas emissions. Herein, the basic mechanism of the nitrogen reduction reaction (NRR) to ammonia and nitrate reduction reaction (NO3 RR) to ammonia were discussed. The representative approaches and major technologies, such as lithium mediated electrolysis and solid oxide electrolysis cell (SOEC) electrolysis for NRR, high activity catalyst and advanced electrochemical device fabrication for NO3 RR and electrochemical ammonia synthesis were summarized. Based on the above discussion and analysis, the main challenges and development directions for electrochemical ammonia synthesis were further proposed.

关键词: electrochemical ammonia synthesis     nitrogen     nitrate     nitrogen reduction reaction (NRR) to ammonia     nitrate reduction reaction (NO–3 RR)    

标题 作者 时间 类型 操作

Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric

期刊论文

Microbial communities biostimulated by ethanol during uranium (VI) bioremediation in contaminated sediment

Mary Beth LEIGH,Wei-Min WU,Erick CARDENAS,Ondrej UHLIK,Sue CARROLL,Terry GENTRY,Terence L. MARSH,Jizhong ZHOU,Philip JARDINE,Craig S. CRIDDLE,James M. TIEDJE

期刊论文

吸附法处理低浓度含铀废水的研究进展

高军凯,顾平,张光辉,高鑫,侯立安

期刊论文

我国铀资源勘查状况及发展前景

张金带,李友良,简晓飞

期刊论文

Oxidative leaching kinetics of molybdenum-uranium ore in H

T. A. Lasheen, M. E. El-Ahmady, H. B. Hassib, A. S. Helal

期刊论文

Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from

Xuewen Hu, Yun Wang, Jinbo Ou Yang,Yang Li, Peng Wu, Hengju Zhang, Dingzhong Yuan, Yan Liu, Zhenyu Wu, Zhirong Liu

期刊论文

Comparison between two commercial uranium resins and a uranyl sulphate imprinted resin based on self-assembling

LIU Yaochi, XU Wei, XU Weijian, LIU Hanmao, ZHANG Xiaowen

期刊论文

铀钚金属表面抗腐蚀性研究进展

傅依备,汪小琳,朱正如

期刊论文

中国铀矿采冶技术发展与展望

阙为民,王海峰,牛玉清,张飞凤,谷万成

期刊论文

Electrocatalytic reduction of NO to NH in ionic liquids by P-doped TiO nanotubes

期刊论文

中国核电的可持续发展

赵仁恺

期刊论文

Enhancement of extracellular Cr(VI) reduction for anammox recovery using hydrazine: performance, pathways

期刊论文

Achieving air pollutant emission reduction targets with minimum abatement costs: An enterprise-level

期刊论文

Stress-related ecophysiology of members of the genus

Om Prakash, Stefan J. Green, Pooja Singh, Puja Jasrotia, Joel E. Kostka

期刊论文

Recent advances and challenges of nitrogen/nitrate electro catalytic reduction to ammonia synthesis

期刊论文