1
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Yang Y, Zhang X, Tian Z, Deissmann G, Bosbach D, Liang P, Wang M. Thermodiffusion of ions in nanoconfined aqueous electrolytes. J Colloid Interface Sci 2022; 619:331-338. [DOI: 10.1016/j.jcis.2022.03.077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 03/08/2022] [Accepted: 03/17/2022] [Indexed: 10/18/2022]
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2
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Recent Review of Titania-Clay-Based Composites Emerging as Advanced Adsorbents and Photocatalysts for Degradation of Dyes over the Last Decade. ADSORPT SCI TECHNOL 2022. [DOI: 10.1155/2022/3823008] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Textile industry being one of the most flourishing industries keeps growing and developing every year, and the consequences are not very pleasant. Even though its contribution towards economy of a country is indisputable, there are many pros and cons associated with it that should not be brushed aside, one of them being textile dye waste which is also growing at alarming rate. Many techniques have been designed to deal with this environmental crisis including adsorption and photodegradation of dye waste by various substances, both natural and synthetic. TiO2 and clay both have gained immense popularity in this area. Over the last decade, many successful attempts have been made to design TiO2-clay-based composites to combine and make the most of their individual capabilities to degrade textile dye waste. While clay is an effective adsorbent, inexpensive, innocuous, and a great ion exchanger, TiO2 provides supplementary active sites and free radicals and speeds up the degradation rate of dyes. This review summarizes various features of TiO2-clay-based composites including their surface characteristics, their role as dye adsorbents and photocatalysts, challenges in their implementation, and modifications to overcome these challenges made over the last decade.
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3
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Development of mini column experiments (MCE) by coupling microliter flow HPLC with ICP MS for the analysis of metal retention under conditions close to nature. TALANTA OPEN 2022. [DOI: 10.1016/j.talo.2022.100111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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4
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Philippou K, Christou CN, Socoliuc V, Vekas L, Tanasă E, Miclau M, Pashalidis I, Krasia‐Christoforou T. Superparamagnetic polyvinylpyrrolidone/chitosan/
Fe
3
O
4
electrospun nanofibers as effective U(
VI
) adsorbents. J Appl Polym Sci 2020. [DOI: 10.1002/app.50212] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
| | - Christos N. Christou
- Department of Mechanical and Manufacturing Engineering University of Cyprus Nicosia Cyprus
| | - Vlad Socoliuc
- Center for Fundamental and Advanced Technical Research, Laboratory of Magnetic Fluids Romanian Academy – Timisoara Branch Timisoara Romania
| | - Ladislau Vekas
- Center for Fundamental and Advanced Technical Research, Laboratory of Magnetic Fluids Romanian Academy – Timisoara Branch Timisoara Romania
- Research Center for Complex Fluids Systems Engineering Politehnica University of Timisoara Timisoara Romania
| | - Eugenia Tanasă
- Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest Bucharest Romania
| | - Marinela Miclau
- Applied Physics Department National Institute for Research and Development in Electrochemistry and Condensed Matter Timisoara Romania
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Boulanger N, Kuzenkova AS, Iakunkov A, Romanchuk AY, Trigub AL, Egorov AV, Bauters S, Amidani L, Retegan M, Kvashnina KO, Kalmykov SN, Talyzin AV. Enhanced Sorption of Radionuclides by Defect-Rich Graphene Oxide. ACS APPLIED MATERIALS & INTERFACES 2020; 12:45122-45135. [PMID: 32902246 PMCID: PMC7684581 DOI: 10.1021/acsami.0c11122] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 09/09/2020] [Indexed: 06/11/2023]
Abstract
Extremely defect graphene oxide (dGO) is proposed as an advanced sorbent for treatment of radioactive waste and contaminated natural waters. dGO prepared using a modified Hummers oxidation procedure, starting from reduced graphene oxide (rGO) as a precursor, shows significantly higher sorption of U(VI), Am(III), and Eu(III) than standard graphene oxides (GOs). Earlier studies revealed the mechanism of radionuclide sorption related to defects in GO sheets. Therefore, explosive thermal exfoliation of graphite oxide was used to prepare rGO with a large number of defects and holes. Defects and holes are additionally introduced by Hummers oxidation of rGO, thus providing an extremely defect-rich material. Analysis of characterization by XPS, TGA, and FTIR shows that dGO oxygen functionalization is predominantly related to defects, such as flake edges and edge atoms of holes, whereas standard GO exhibits oxygen functional groups mostly on the planar surface. The high abundance of defects in dGO results in a 15-fold increase in sorption capacity of U(VI) compared to that in standard Hummers GO. The improved sorption capacity of dGO is related to abundant carboxylic group attached hole edge atoms of GO flakes as revealed by synchrotron-based extended X-ray absorption fine structure (EXAFS) and high-energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) spectroscopy.
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Affiliation(s)
| | - Anastasiia S. Kuzenkova
- Department
of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - Artem Iakunkov
- Department
of Physics, Umeå University, S-90187 Umeå, Sweden
| | - Anna Yu. Romanchuk
- Department
of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - Alexander L. Trigub
- Department
of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
- National
Research Centre “Kurchatov Institute”, Moscow 123098, Russia
| | - Alexander V. Egorov
- Department
of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - Stephen Bauters
- The
Rossendorf Beamline at ESRF − The
European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
- Helmholtz
Zentrum Dresden-Rossendorf (HZDR), Institute
of Resource Ecology, P. O. Box 510119, 01314 Dresden, Germany
| | - Lucia Amidani
- The
Rossendorf Beamline at ESRF − The
European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
- Helmholtz
Zentrum Dresden-Rossendorf (HZDR), Institute
of Resource Ecology, P. O. Box 510119, 01314 Dresden, Germany
| | - Marius Retegan
- The
European
Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - Kristina O. Kvashnina
- Department
of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
- The
Rossendorf Beamline at ESRF − The
European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
- Helmholtz
Zentrum Dresden-Rossendorf (HZDR), Institute
of Resource Ecology, P. O. Box 510119, 01314 Dresden, Germany
| | - Stepan N. Kalmykov
- Department
of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
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6
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Montavon G, Lerouge C, David K, Ribet S, Hassan-Loni Y, Leferrec M, Bailly C, Robinet JC, Grambow B. Nickel Retention on Callovo-Oxfordian Clay: Applicability of Existing Adsorption Models for Dilute Systems to Real Compact Rock. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:12226-12234. [PMID: 32924461 DOI: 10.1021/acs.est.0c04381] [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 a waste management context, predicting the mobility of contaminants is essential. A key issue entails assessing the applicability of current knowledge on adsorption processes to natural systems. Such is the focus herein for nickel in interaction with Callovo-Oxfordian (COx) clay rock, a formation selected in France for possible radioactive waste disposal. The challenge is to link predictive modeling results with the experimental data characterizing the behavior of the labile and naturally occurring Ni fraction by implementing a new simple method. Retention studies on compact systems serve to complete this work. Combined electron microprobe and laser ablation high-resolution inductively coupled plasma mass spectrometry data show that natural Ni (∼39 mg kg-1) is homogeneously distributed within the clay matrix, which corresponds to the main reservoir (∼70%). Data interpretation of desorption tests yields an in situ Kd value of ∼80 L kg-1 and a labile Ni amount of ∼5 mg kg-1, that is, ∼13% of the Ni inventory. Predictive modeling explains the sorption data in considering that only weak clay fraction sites take part in the adsorption. The role of the clay matrix in Ni retention is confirmed by analyzing the Ni-spiked compact COx samples, whereby an increase of the Ni content in the clay fraction is observed following the retention experiment.
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Affiliation(s)
- Gilles Montavon
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
| | | | - Karine David
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
| | - Solange Ribet
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
| | - Yahaya Hassan-Loni
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
| | - Myriam Leferrec
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
| | - Céline Bailly
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
| | - Jean-Charles Robinet
- R&D Division, ANDRA, 1/7, Rue Jean Monnet Parc de la Croix-Blanche, F-92298 Châtenay-Malabry, France
| | - Bernd Grambow
- SUBATECH UMR6457, IMT Atlantique/CNRS-IN2P3/Université de Nantes, 4, Rue Alfred Kastler, F-44304 Nantes, France
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7
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Xie Y, Chen C, Ren X, Wang X, Wang H, Wang X. Emerging natural and tailored materials for uranium-contaminated water treatment and environmental remediation. PROGRESS IN MATERIALS SCIENCE 2019; 103:180-234. [DOI: https:/doi.org/10.1016/j.pmatsci.2019.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/25/2023]
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8
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Yang Y, Wang M. Cation Diffusion in Compacted Clay: A Pore-Scale View. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:1976-1984. [PMID: 30652850 DOI: 10.1021/acs.est.8b05755] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Cation diffusion through compacted clays is of great interest due to its potential for buffer materials for waste disposal. The importance of the electrokinetic effect on cationic tracer diffusion is investigated by using pore-scale simulations to consider the influence from the electrokinetic properties and topology of clays. It is indicated that the normalized volume charge density has a significant impact on the cationic diffusion. In clays with a large normalized volume charge density, the electrical double layer has the major impact on cationic diffusion. When the ion strength of the pore solution is constant, the flux from the electromigration term can be negligible. However, once an ion strength gradient is added, the electromigration process should be considered carefully due to its non-negligible role to balance the alteration of total flux. The present study could help improve the understanding of the transport mechanism of simple cationic tracers in compacted clays.
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Affiliation(s)
- Yuankai Yang
- Department of Engineering Mechanics and CNMM , Tsinghua University , Beijing 100084 , China
| | - Moran Wang
- Department of Engineering Mechanics and CNMM , Tsinghua University , Beijing 100084 , China
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9
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Kang SM, Jang SC, Heo NS, Oh SY, Cho HJ, Rethinasabapathy M, Vilian ATE, Han YK, Roh C, Huh YS. Cesium-induced inhibition of bacterial growth of Pseudomonas aeruginosa PAO1 and their possible potential applications for bioremediation of wastewater. JOURNAL OF HAZARDOUS MATERIALS 2017; 338:323-333. [PMID: 28582713 DOI: 10.1016/j.jhazmat.2017.05.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Revised: 05/24/2017] [Accepted: 05/25/2017] [Indexed: 06/07/2023]
Abstract
Radioactive isotopes and fission products have attracted considerable attention because of their long lasting serious damage to the health of humans and other organisms. This study examined the toxicity and accumulation behavior of cesium towards P. aeruginosa PAO1 and its capacity to remove cesium from waste water. Interestingly, the programmed bacterial growth inhibition occurred according to the cesium environment. The influence of cesium was analyzed using several optical methods for quantitative evaluation. Cesium plays vital role in the growth of microorganisms and functions as an anti-microbial agent. The toxicity of Cs to P. aeruginosa PAO1 increases as the concentration of cesium is increased in concentration-dependent manner. P. aeruginosa PAO1 shows excellent Cs removal efficiency of 76.1% from the contaminated water. The toxicity of cesium on the cell wall and in the cytoplasm were studied by transmission electron microscopy and electron dispersive X-ray analysis. Finally, the removal of cesium from wastewater using P. aeruginosa PAO1 as a potential biosorbent and the blocking of competitive interactions of other monovalent cation, such as potassium, were assessed. Overall, P. aeruginosa PAO1 can be used as a high efficient biomaterial in the field of radioactive waste disposal and management.
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Affiliation(s)
- Sung-Min Kang
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea; Biotechnology Research Division, Advanced Radiation Technology Institute (ARTI), Korea Atomic Energy Research Institute (KAERI), 29 Geumgu-gil, Jeongeup, Jeonbuk, 56212, Republic of Korea
| | - Sung-Chan Jang
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea; Biotechnology Research Division, Advanced Radiation Technology Institute (ARTI), Korea Atomic Energy Research Institute (KAERI), 29 Geumgu-gil, Jeongeup, Jeonbuk, 56212, Republic of Korea
| | - Nam Su Heo
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea
| | - Seo Yeong Oh
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea
| | - Hye-Jin Cho
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Republic of Korea
| | - Muruganantham Rethinasabapathy
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea
| | - A T Ezhil Vilian
- Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, Republic of Korea
| | - Young-Kyu Han
- Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, Republic of Korea.
| | - Changhyun Roh
- Biotechnology Research Division, Advanced Radiation Technology Institute (ARTI), Korea Atomic Energy Research Institute (KAERI), 29 Geumgu-gil, Jeongeup, Jeonbuk, 56212, Republic of Korea; Radiation Biotechnology and Applied Radioisotope Science, University of Science Technology (UST), 217 Gajeong-ro, Daejeon, 34113, Republic of Korea.
| | - Yun Suk Huh
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea; WCSL of Integrated Human Airway-on-a-Chip, Inha University, Incheon, Republic of Korea.
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10
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Yang Y, Wang M. Upscaling scheme for long-term ion diffusion in charged porous media. Phys Rev E 2017; 96:023308. [PMID: 28950467 DOI: 10.1103/physreve.96.023308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Indexed: 11/07/2022]
Abstract
Description of long-term (over years) ion diffusion at the pore scale is a huge challenge since the characteristic time of diffusion in a typical representative elementary volume is around microseconds, generally ten orders of magnitude lower than the time we were concerned with. This paper presents a numerical upscaling scheme for ion diffusion with electrical double-layer effects (electrodiffusion) considered in charged porous media. After a scaling analysis for the nondimensional governing equations of ion transport at the pore scale, we identify the conditions for decoupling of electrical effect and diffusion, and therefore are able to choose apposite temporal and spatial scales for corresponding directions of the electrodiffusion process. The upscaling scheme is therefore proposed based on a numerical framework for governing equations using a lattice Boltzmann method. The electrical potential or concentration profiles from steady- or unsteady-state electrodiffusion in the long, straight channel, calculated by this upscaling scheme, are compared with the well-meshed full-sized simulations with good agreement. Furthermore, this scheme is used to predict tracer-ion throughdiffusion and outdiffusion in hardened cement pastes. All numerical results show good agreement with the full-sized simulations or experiment data without any fitting parameters. This upscaling scheme bridges the ion diffusion behaviors in different time scales, and may help to improve the understanding of long-term ion transport mechanisms in charged porous media.
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Affiliation(s)
- Yuankai Yang
- Department of Engineering Mechanics and CNMM, Tsinghua University, Beijing 100084, China
| | - Moran Wang
- Department of Engineering Mechanics and CNMM, Tsinghua University, Beijing 100084, China
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11
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Na-Montmorillonite Edge Structure and Surface Complexes: An Atomistic Perspective. MINERALS 2017. [DOI: 10.3390/min7050078] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Thach UD, Hesemann P, Yang G, Geneste A, Le Caër S, Prelot B. Ionosilicas as efficient sorbents for anionic contaminants: Radiolytic stability and ion capacity. J Colloid Interface Sci 2016; 482:233-239. [DOI: 10.1016/j.jcis.2016.07.069] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 07/25/2016] [Accepted: 07/26/2016] [Indexed: 10/21/2022]
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13
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Song W, Wang X, Tao W, Wang H, Hayat T, Wang X. Enhanced accumulation of U(VI) by Aspergillus oryzae mutant generated by dielectric barrier discharge air plasma. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-4934-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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15
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Miller A, Kruichak J, Mills M, Wang Y. Iodide uptake by negatively charged clay interlayers? JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2015; 147:108-114. [PMID: 26057987 DOI: 10.1016/j.jenvrad.2015.05.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 05/21/2015] [Accepted: 05/26/2015] [Indexed: 06/04/2023]
Abstract
Understanding iodide interactions with clay minerals is critical to quantifying risk associated with nuclear waste disposal. Current thought assumes that iodide does not interact directly with clay minerals due to electrical repulsion between the iodide and the negatively charged clay layers. However, a growing body of work indicates a weak interaction between iodide and clays. The goal of this contribution is to report a conceptual model for iodide interaction with clays by considering clay mineral structures and emergent behaviors of chemical species in confined spaces. To approach the problem, a suite of clay minerals was used with varying degrees of isomorphic substitution, chemical composition, and mineral structure. Iodide uptake experiments were completed with each of these minerals in a range of swamping electrolyte identities (NaCl, NaBr, KCl) and concentrations. Iodide uptake behaviors form distinct trends with cation exchange capacity and mineral structure. These trends change substantially with electrolyte composition and concentration, but do not appear to be affected by solution pH. The experimental results suggest that iodide may directly interact with clays by forming ion-pairs (e.g., NaI(aq)) which may concentrate within the interlayer space as well as the thin areas surrounding the clay particle where water behavior is more structured relative to bulk water. Ion pairing and iodide concentration in these zones is probably driven by the reduced dielectric constant of water in confined space and by the relatively high polarizability of the iodide species.
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Affiliation(s)
- Andrew Miller
- Emporia State University, 1 Kellogg Circle, Emporia, KS, 66801, United States.
| | - Jessica Kruichak
- Sandia National Laboratories, 1515 Eubank SE, Albuquerque, NM, 87185-0779, United States
| | - Melissa Mills
- Sandia National Laboratories, 1515 Eubank SE, Albuquerque, NM, 87185-0779, United States
| | - Yifeng Wang
- Sandia National Laboratories, 1515 Eubank SE, Albuquerque, NM, 87185-0779, United States
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16
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Li S, Wan Q, Qin Z, Fu Y, Gu Y. Understanding Stöber silica's pore characteristics measured by gas adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:824-32. [PMID: 25514625 DOI: 10.1021/la5042103] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Controversial reports regarding Stöber silica's microporosity and specific surface area remain in the literature despite decades of widespread applications. In this work, Stöber silica samples prepared under controlled reaction time and postsynthesis washing/drying conditions were characterized by nitrogen adsorption at 77 K, transmission electron microscopy, elemental analysis, Fourier transform infrared spectroscopy, thermal analysis, and evolved gas analysis. Our experimental results demonstrated the important but often overlooked effects of reaction time and postsynthesis treatments on Stöber silica's pore characteristics, as evidenced by the strikingly large range of BET specific surface area (11.3-309.7 m(2)/g). A simple micropore filling and blocking mechanism compatible with an existing Stöber silica growth model incorporating both aggregation and monomer addition steps was proposed to explain all our experimental findings. The carbon and nitrogen contents appear to serve well as the indicative link between our experimental variables and the resulting pore blocking by TEOS and its derivatives. A suitable combination of experimental conditions is recommended in order to make microporous Stöber silica samples with large specific surface area, including a short reaction time, water washing, and drying at moderate temperature preferably under vacuum.
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Affiliation(s)
- Shanshan Li
- State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences , Guiyang, Guizhou 550002, China
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17
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Zhang N, Liu X, Li C, Liu C. Effect of electrolyte concentration on uranium species adsorption: a molecular dynamics study. Inorg Chem Front 2015. [DOI: 10.1039/c4qi00141a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A threshold electrolyte concentration may cause a dramatic alteration in the uranyl species adsorption relative to lower electrolyte concentrations.
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Affiliation(s)
- Na Zhang
- Beijing National Laboratory for Molecular Sciences
- Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Xiaoyu Liu
- Beijing National Laboratory for Molecular Sciences
- Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Chun Li
- Beijing National Laboratory for Molecular Sciences
- Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Chunli Liu
- Beijing National Laboratory for Molecular Sciences
- Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
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18
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Tamura K, Sato H, Yamagishi A. Desorption of Cs+ ions from a vermiculite by exchanging with Mg2+ ions: effects of Cs+-capturing ligand. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3744-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Chitrakar R, Makita Y, Sonoda A. Cesium Ion Decontamination by Layered Perovskite HCa2Nb3O10·1.5H2O. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20130201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ramesh Chitrakar
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Yoji Makita
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Akinari Sonoda
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
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20
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Chitrakar R, Makita Y, Sonoda A. Cesium Ion Uptake by Synthetic K-birnessite K0.30(Mn4+0.90Mn3+0.030.07)O2·0.50H2O. CHEM LETT 2013. [DOI: 10.1246/cl.130331] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ramesh Chitrakar
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Yoji Makita
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Akinari Sonoda
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
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21
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Sheng G, Shen R, Dong H, Li Y. Colloidal diatomite, radionickel, and humic substance interaction: a combined batch, XPS, and EXAFS investigation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:3708-3717. [PMID: 23143822 DOI: 10.1007/s11356-012-1278-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 10/22/2012] [Indexed: 06/01/2023]
Abstract
This work determined the influence of humic acid (HA) and fulvic acid (FA) on the interaction mechanism and microstructure of Ni(II) onto diatomite by using batch experiments, X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS) methods. Macroscopic and spectroscopic experiments have been combined to see the evolution of the interaction mechanism and microstructure of Ni(II) in the presence of HA/FA as compared with that in the absence of HA/FA. The results indicated that the interaction of Ni(II) with diatomite presents the expected solution pH edge at 7.0, which is modified by addition of HA/FA. In the presence of HA/FA, the interaction of Ni(II) with diatomite increased below solution pH 7.0, while Ni(II) interaction decreased above solution pH 7.0. XPS analysis suggested that the enrichment of Ni(II) onto diatomite may be due to the formation of (≡SO)2Ni. EXAFS results showed that binary surface complexes and ternary surface complexes of Ni(II) can be simultaneously formed in the presence of HA/FA, whereas only binary surface complexes of Ni(II) are formed in the absence of HA/FA, which contribute to the enhanced Ni(II) uptake at low pH values. The results observed in this work are important for the evaluation of Ni(II) and related radionuclide physicochemical behavior in the natural soil and water environment.
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Affiliation(s)
- Guodong Sheng
- School of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang, 312000, People's Republic of China.
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Geckeis H, Lützenkirchen J, Polly R, Rabung T, Schmidt M. Mineral–Water Interface Reactions of Actinides. Chem Rev 2013; 113:1016-62. [DOI: 10.1021/cr300370h] [Citation(s) in RCA: 223] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Horst Geckeis
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Johannes Lützenkirchen
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Robert Polly
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Thomas Rabung
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Moritz Schmidt
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
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Michelin A, Burger E, Rebiscoul D, Neff D, Bruguier F, Drouet E, Dillmann P, Gin S. Silicate glass alteration enhanced by iron: origin and long-term implications. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:750-756. [PMID: 23237387 DOI: 10.1021/es304057y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Silicate glasses are used as containment matrices for deep geological disposal of nuclear waste arising from spent fuel reprocessing. Understanding the dissolution mechanisms of glasses in contact with iron, an element present in large amounts in the immediate environment (overpack, claystone, etc.) would be a major breakthrough toward predicting radionuclide release in the geosphere after disposal. Two different reacted glass-iron interfaces-a short-term nuclear system and a long-term archeological system-were examined using a multiscale and multianalytical approach including, for the first time on samples of this type, STXM under synchrotron radiation. Comparisons revealed remarkable similarities between the two systems and shed light on Fe-Si interactions, including migration of iron within a porous gel layer and precipitation of Fe-silicates that locally increase short-term glass alteration and are sustainable over the long-term.
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Affiliation(s)
- A Michelin
- CEA, DEN, (DTCD/SECM/LCLT) -Marcoule, F-30207 Bagnols-sur-Cèze Cedex, France
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