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Publications (10 of 36) Show all publications
Chen, S., Abdel-Magied, A. F., Fu, L., Jonsson, M. & Forsberg, K. (2019). Incorporation of strontium and europium in crystals of α-calcium isosaccharinate. Journal of Hazardous Materials, 364, 309-316
Open this publication in new window or tab >>Incorporation of strontium and europium in crystals of α-calcium isosaccharinate
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2019 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 364, p. 309-316Article in journal (Refereed) Published
Abstract [en]

The final repository for short-lived, low and intermediate level radioactive waste in Sweden is built to act as a passive repository. Already within a few years after closure water will penetrate the repository and conditions of high alkalinity (pH 10.5―13.5) and low temperature (< 7 °C) will prevail. The mobility of radionuclides in the repository is dependent on the radionuclides distribution between solid and liquid phases. In the present work the incorporation of strontium (II) and europium (III) in α-calcium isosaccharinate (ISA) under alkaline conditions (pH ~10) at 5 °C and 50 °C have been studied. The results show that strontium and europium are incorporated into α-Ca(ISA)2 when crystallized both at 5 °C and 50 °C. Europium is incorporated to a greater extent than strontium. The highest incorporation of europium and strontium at 5 °C rendered the phase compositions Ca0.986Eu0.014(ISA)2 (2.4% of Eu(ISA)3 by mass) and Ca0.98Sr0.02(ISA)2 (2.2% of Sr(ISA)2 by mass). XPS spectra show that both trivalent and divalent Eu coexist in the Eu incorporated samples. Strontium ions were found to retard the elongated growth of the Ca(ISA)2crystals. The incorporation of Sr2+ and Eu3+ into the solid phase of Ca(ISA)2 is expected to contribute to a decreased mobility of these ions in the repository.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Mobility, radionuclides, isosaccharinate, precipitation
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-235920 (URN)10.1016/j.jhazmat.2018.10.001 (DOI)000452926500034 ()30384240 (PubMedID)2-s2.0-85055549831 (Scopus ID)
Funder
Swedish Radiation Safety Authority, SSM2016-2126
Note

QC 20181010

Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2019-05-20Bibliographically approved
Alemrajabi, M., Rasmuson, Å. C., Korkmaz, K. & Forsberg, K. (2019). Processing of a rare earth phosphate concentrate obtained in the nitrophosphate process of fertilizer production. Hydrometallurgy
Open this publication in new window or tab >>Processing of a rare earth phosphate concentrate obtained in the nitrophosphate process of fertilizer production
2019 (English)In: Hydrometallurgy, ISSN 0304-386X, E-ISSN 1879-1158Article in journal (Refereed) Published
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-257525 (URN)10.1016/j.hydromet.2019.105144 (DOI)
Note

QCR 20190903

Available from: 2019-09-01 Created: 2019-09-01 Last updated: 2019-09-16
Korkmaz, K., Alemrajabi, M., Rasmuson, Å. C. & Forsberg, K. (2019). Separation of Valuable Elements from NiMH Battery Leach Liquor via Antisolvent Precipitation. Separation and Purification Technology
Open this publication in new window or tab >>Separation of Valuable Elements from NiMH Battery Leach Liquor via Antisolvent Precipitation
2019 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794Article in journal (Refereed) Published
Keywords
Hydrometallurgy, Anti-solvent crystallization, NiMH battery recycling, Rare earth recovery
National Category
Chemical Process Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-256457 (URN)10.1016/j.seppur.2019.115812 (DOI)
Funder
Swedish Energy Agency
Note

QC 20190902

Available from: 2019-08-23 Created: 2019-08-23 Last updated: 2019-09-14
Chernyshev, A. N., Jonsson, M. & Forsberg, K. (2018). Characterization and degradation of a polyaryl ether based superplasticizer for use in concrete barriers in deep geological repositories. Applied Geochemistry, 95, 172-181
Open this publication in new window or tab >>Characterization and degradation of a polyaryl ether based superplasticizer for use in concrete barriers in deep geological repositories
2018 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 95, p. 172-181Article in journal (Refereed) Published
Abstract [en]

Superplasticizers are important additives used in concrete barriers in geological waste repositories. Superplasticizers have been a major concern in the long-term assessments of safe geological disposal for radioactive waste since superplasticizers and their degradation products can act as complexing ligands and thereby increase the mobility of radionuclides. In this work a new type of superplasticizer, based on a polyaryl ether polymer, has been characterized. It was found that the superplasticizer combines the structural features of polycarboxylate ether based superplasticizers and sulfonated naphthalene-formaldehyde based superplasticizers and that it contains organophosphatecharged groups. A novel method for evaluating the rate of degradation of the superplasticizer under alkaline conditions was elaborated and the degradation products and rate constant of the process was determined. The results demonstrate that degradation occurs rapidly compared to the typical lifetime of a repository.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Waste disposal; Alkaline degradation; Polyaryl ether based superplasticizer
National Category
Chemical Engineering Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-228236 (URN)10.1016/j.apgeochem.2018.05.014 (DOI)000437294900015 ()2-s2.0-85048180279 (Scopus ID)
Funder
Swedish Nuclear Fuel and Waste Management Company, SKB
Note

QC 20180611

Available from: 2018-05-20 Created: 2018-05-20 Last updated: 2018-11-28Bibliographically approved
Ashour, R., Samouhos, M., Polido Legaria, E., Svärd, M., Högblom, J., Forsberg, K., . . . Rasmuson, Å. C. (2018). DTPA-Functionalized Silica Nano- and Microparticles for Adsorption and Chromatographic Separation of Rare Earth Elements. ACS Sustainable Chemistry & Engineering, 6(5), 6889-6900
Open this publication in new window or tab >>DTPA-Functionalized Silica Nano- and Microparticles for Adsorption and Chromatographic Separation of Rare Earth Elements
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2018 (English)In: ACS Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 6, no 5, p. 6889-6900Article in journal (Refereed) Published
Abstract [en]

Silica nanoparticles and porous microparticles have been successfully functionalized with a monolayer of DTPA-derived ligands. The ligand grafting is chemically robust and does not appreciably influence the morphology or the structure of the material. The produced particles exhibit quick kinetics and high capacity for REE adsorption. The feasibility of using the DTPA-functionalized microparticles for chromatographic separation of rare earth elements has been investigated for different sample concentrations, elution modes, eluent concentrations, eluent flow rates, and column temperatures. Good separation of the La(III), Ce(III), Pr(III), Nd(III), and Dy(III) ions was achieved using HNO3 as eluent using a linear concentration gradient from 0 to 0.15 M over 55 min. The long-term performance of the functionalized column has been verified, with very little deterioration recorded over more than 50 experiments. The results of this study demonstrate the potential for using DTPA-functionalized silica particles in a chromatographic process for separating these valuable elements from waste sources, as an environmentally preferable alternative to standard solvent-intensive processes.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
Chelation ion chromatography; Diethylenetriaminepentaacetic acid; Hybrid nanoadsorbent; Rare earth elements; Separation
National Category
Chemical Engineering Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-226580 (URN)10.1021/acssuschemeng.8b00725 (DOI)000431927500131 ()2-s2.0-85046140915 (Scopus ID)
Funder
Swedish Foundation for Strategic Research , IRT 11-0026EU, FP7, Seventh Framework Programme, 309373
Note

QC 20180509

Available from: 2018-04-21 Created: 2018-04-21 Last updated: 2019-04-01Bibliographically approved
Chen, S., Wang, S., Li, H. & Forsberg, K. (2018). Eu3+ doped monetite and its use as fluorescent agent for dental restorations. Ceramics International, 44(9), 10510-10516
Open this publication in new window or tab >>Eu3+ doped monetite and its use as fluorescent agent for dental restorations
2018 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 44, no 9, p. 10510-10516Article in journal (Refereed) Published
Abstract [en]

It is essential but challenging to distinguish the dental restorations from the surrounding teeth when removing filling materials from cavity. In this study, Eu3+ doped monetite was proposed as a fluorescent agent for dental restorations to meet this challenge. Eu3+ doped monetite with enhanced fluorescent property was obtained via a precipitation method. The presence of Eu3+ could prevent the phase transformation of brushite to monetite. However, all the brushite particles transformed to monetite at 300 °C and to tricalcium phosphate at 800 °C. The emission intensity increased with the addition of Eu3+ and reached the maximum when 12 mol% Eu3+ was added into the aqueous solution. With either 254 nm or 393 nm excitation, Eu3+ doped monetite showed the strongest fluorescence emission peaking at 616 nm and other two moderate bands peaking at 699 nm and 593 nm. The excitation spectra at the emission wavelength of 616 nm showed strong absorption peaks at 254 nm and 393 nm. We further investigate the fluorescence properties of Eu3+ doped monetite in one type of dental restorations. Glass ionomer cement with Eu3+ doped monetite exhibited clear fluoresce with origin color under UV irradiation at 254 nm, showing that Eu3+doped monetite is a promising fluorescent agent for dental restorations.

Place, publisher, year, edition, pages
Saunders Elsevier, 2018
National Category
Materials Chemistry Physical Chemistry Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-226579 (URN)10.1016/j.ceramint.2018.03.068 (DOI)000431470200063 ()2-s2.0-85044146541 (Scopus ID)
Note

QC 20180509

Available from: 2018-04-21 Created: 2018-04-21 Last updated: 2018-12-14Bibliographically approved
Martínez, J., Rodríguez Varela, R., Forsberg, K. & Rasmuson, Å. C. (2018). Factors Influencing Separation Selectivity of Rare Earth Elements in Flat Sheet Supported Liquid Membranes. Chemical Engineering Science, 191, 134-155
Open this publication in new window or tab >>Factors Influencing Separation Selectivity of Rare Earth Elements in Flat Sheet Supported Liquid Membranes
2018 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 191, p. 134-155Article in journal (Refereed) Published
Abstract [en]

Separation selectivity of the mixture Yttrium-Neodymium-Dysprosium using Bis (2-ethylhexyl) hydrogen phosphate (D2EHPA) as extractant in a flat sheet supported liquid membrane was studied by simulations. A new definition of selectivity and a diffusional-kinetic transient model were used in the calculations. Resistance distribution between the phases, stripping phase pH, extractant concentration and initial feed concentration have great influence on selectivity and process time and their appropriate management would improve separation. The analysis of selectivity using the present model would be a useful tool to design a multistage process aimed at the separation of a multicomponent mixture of rare earth elements into its constituents.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Supported liquid membrane extraction; Modeling; Separation; Extraction; Lanthanide; Selectivity
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-230780 (URN)10.1016/j.ces.2018.06.018 (DOI)000442381500011 ()2-s2.0-85049097105 (Scopus ID)
Funder
Swedish Foundation for Strategic Research , IRT 11-0026
Note

QC 20180620

Available from: 2018-06-15 Created: 2018-06-15 Last updated: 2018-09-07Bibliographically approved
Korkmaz, K., Alemrajabi, M., Rasmuson, Å. C. & Forsberg, K. (2018). Recoveries of Valuable Metals from Spent Nickel Metal Hydride Vehicle Batteries via Sulfation, Selective Roasting, and Water Leaching. Journal of Sustainable Metallurgy, 4(3), 313-325
Open this publication in new window or tab >>Recoveries of Valuable Metals from Spent Nickel Metal Hydride Vehicle Batteries via Sulfation, Selective Roasting, and Water Leaching
2018 (English)In: Journal of Sustainable Metallurgy, ISSN 2199-3823, Vol. 4, no 3, p. 313-325Article in journal (Refereed) Published
Abstract [en]

The recoveries of rare earth elements (REEs), nickel, and cobalt from hybrid electric vehicle batteries by sulfation, selective roasting, and water leaching have been studied. The cathode and anode materials of a Panasonic Prismatic Module nickel metal hydride (NiMH) battery were used in the study. The optimal conditions for each step of the process were determined by performing lab-scale experiments. It was found that 8 mol/L of sulfuric acid was sufficient for the sulfation with a solid-to-liquid ratio of 1/5. The optimal roasting conditions was determined to be 850 °C for 2 h. Under optimal conditions, 96% of the REEs could be obtained in the aqueous phase with negligible contamination of Ni and Co. The Ni and Co remained in solid phase as oxides together with traces of aluminum, zinc, and iron oxides. This method provides a way for the separation of the REEs from nickel, cobalt, and other elements present in the NiMH battery, into a leachate suitable for further processing.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Hydrometallurgy Rare earth recovery Selective roasting NiMH battery recycling
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-226570 (URN)10.1007/s40831-018-0169-1 (DOI)000442659000001 ()
Note

QC 20180509

Available from: 2018-04-21 Created: 2018-04-21 Last updated: 2018-09-07Bibliographically approved
Korkmaz, K., Alemrajabi, M., Rasmuson, Å. C. & Forsberg, K. (2018). Sustainable Hydrometallurgical Recovery of Valuable Elements from Spent Nickel-Metal Hydride HEV Batteries. Metals, 8(12)
Open this publication in new window or tab >>Sustainable Hydrometallurgical Recovery of Valuable Elements from Spent Nickel-Metal Hydride HEV Batteries
2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 12Article in journal (Refereed) Published
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-240291 (URN)10.3390/met8121062 (DOI)2-s2.0-85048361582 (Scopus ID)
Note

QC 20181217

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2018-12-17Bibliographically approved
Rodríguez Varela, R., Forsberg, K., Martínez, J. & Rasmuson, Å. C. (2017). Comparative performance of emulsion pertraction technology (EPT) and hollow fibre renewal liquid membrane (HFRLM) for REE extraction. In: : . Paper presented at 2nd conference on European rare earth resources (ERES), Santorini, Greece, 28- 31 May.
Open this publication in new window or tab >>Comparative performance of emulsion pertraction technology (EPT) and hollow fibre renewal liquid membrane (HFRLM) for REE extraction
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-237440 (URN)
Conference
2nd conference on European rare earth resources (ERES), Santorini, Greece, 28- 31 May
Note

QC 20181214

Available from: 2018-10-27 Created: 2018-10-27 Last updated: 2018-12-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3239-5188

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