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Gunneriusson, Lars
Publications (10 of 20) Show all publications
Jolsterå, R., Gunneriusson, L. & Holmgren, A. (2012). Surface complexation modeling of Fe3O4-H+ and Mg(II) sorption onto maghemite and magnetite (ed.). Paper presented at . Journal of Colloid and Interface Science, 386(1), 260-267
Open this publication in new window or tab >>Surface complexation modeling of Fe3O4-H+ and Mg(II) sorption onto maghemite and magnetite
2012 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 386, no 1, p. 260-267Article in journal (Refereed) Published
Abstract [en]

The surface acid/base properties of magnetite (Fe3O4) particles and the sorption of Mg2+ onto magnetite and maghemite (γ-Fe2O3), have been studied using high precision potentiometric titrations, batch experiments and zeta potential measurements. The acid/base properties of magnetite were found to be very similar to maghemite except for the difference in surface site density, Ns (sites nm-2), 1.50±0.08 for magnetite and 0.99±0.05 for maghemite. The experimental proton exchange of the magnetite surface increased from pH 10 and above, indicating dissolution/transformation reactions of magnetite at alkaline conditions. Thus, magnetite with its Fe(II) content proved to be less stable towards dissolution in comparison with pure Fe(III) oxides also at high pH values.Three different ratios between surface sites and added Mg2+ were used in the sorption experiments viz. 0.5, 1 and 2 Mg2+ site-1. Surface complexation modeling of the Mg2+ sorption onto maghemite and magnetite, was restricted to pH conditions where the interference from Mg(OH)2(s) precipitation could be ruled out. The model calculations showed that Mg2+ sorb onto the magnetite and maghemite surfaces as a mixture of mono- or bidentate surface complexes at 0.5 Mg2+ site-1 and as monodentate complexes at 1 and 2 Mg2+ site-1 conditions. Mg2+ was also found to adsorb more readily at the maghemite surfaces in comparison with magnetite surfaces. For experiments with excess Mg2+ relative to the number of surface sites, the calculations suggested the formation of polynuclear surface complexes on maghemite.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-13821 (URN)10.1016/j.jcis.2012.07.031 (DOI)000316581600033 ()22889624 (PubMedID)2-s2.0-84865989162 (Scopus ID)d1d43e77-7c5f-434d-b23a-85c4715f58fd (Local ID)d1d43e77-7c5f-434d-b23a-85c4715f58fd (Archive number)d1d43e77-7c5f-434d-b23a-85c4715f58fd (OAI)
Note
Validerad; 2012; 20120806 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Antzutkin, O., Kota, H. R., Ikumapayi, F., Holmgren, A., Gunneriusson, L., Johansson, B., . . . Forsmo, S. (2011). Interactions in multi-component mineral systems (ed.). Paper presented at Bergforsk Annual Meeting 2011 : 04/05/2011 - 05/05/2011. Paper presented at Bergforsk Annual Meeting 2011 : 04/05/2011 - 05/05/2011.
Open this publication in new window or tab >>Interactions in multi-component mineral systems
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2011 (English)Conference paper, Oral presentation only (Other academic)
National Category
Physical Chemistry Metallurgy and Metallic Materials Physical Chemistry Computational Mathematics Chemical Process Engineering
Research subject
Chemistry of Interfaces; Mineral Processing; Physical Chemistry; Scientific Computing; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-27849 (URN)16a11c6b-04a2-401e-8fbc-042c492c86b3 (Local ID)16a11c6b-04a2-401e-8fbc-042c492c86b3 (Archive number)16a11c6b-04a2-401e-8fbc-042c492c86b3 (OAI)
Conference
Bergforsk Annual Meeting 2011 : 04/05/2011 - 05/05/2011
Note
Godkänd; 2011; 20110816 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-05Bibliographically approved
Jolsterå, R., Gunneriusson, L. & Forsling, W. (2010). Adsorption and surface complex modeling of silicates on maghemite in aqueous suspensions (ed.). Paper presented at . Journal of Colloid and Interface Science, 342(2), 493-498
Open this publication in new window or tab >>Adsorption and surface complex modeling of silicates on maghemite in aqueous suspensions
2010 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 342, no 2, p. 493-498Article in journal (Refereed) Published
Abstract [en]

Adsorption of soluble silicate species, (Si(OH)4) on maghemite, (γ-Fe2O3) has been studied by high precision potentiometric titrations, spectroscopic analyses and zeta potential determinations. Titrations were performed at 25.0 °C within the range 2.8 < pH < 11.1 and at a constant ionic strength of 0.100 mol dm-3. The experimental data were evaluated using the constant capacitance model. For the maghemite - H+ system, the following values for the surface complexation constants and capacitance were found: ≡FeOH + H+ ↔ ≡FeOH2+; log βs11(int) = 5.39 ± 0.01 ≡FeOH ↔ ≡FeO- + H+; log βs-11(int) = -7.51 ± 0.01; C = 2.40 Fm-2.Three different concentration ratios of the determined concentration of active surface sites and added total silicate concentration, [≡FeOH]:[Si(OH)4], were examined (1:1, 2:1 and 3:1). A model comprising of three surface complexes, ≡FeOSi(OH)3, log βs011(int) = 3.61 ± 0.02; ≡FeOSiO(OH)2-, log βs-111(int) = -3.00 ± 0.01; and ≡FeOSiO2(OH)2-, log βs-211(int) = -11.35 ± 0.02; was found to best describe the experimental observations. Attempts to model the adsorption of silicates on maghemite as bidentate or polynuclear silicate complexes were not successful. The maximum silicate adsorption for the 1:1 ratio, approximately 80%, was obtained at pH 9 - 9.5. The IEP of maghemite in the presence of silicates (1:1 ratio) was determined from ζ-potential measurements, giving pHIEP ≈ 6.6.

Keywords
Natural sciences - Chemistry, Naturvetenskap - Kemi
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-14062 (URN)10.1016/j.jcis.2009.10.080 (DOI)000274117400036 ()20006343 (PubMedID)2-s2.0-72649084654 (Scopus ID)d6084f90-caaf-11de-b769-000ea68e967b (Local ID)d6084f90-caaf-11de-b769-000ea68e967b (Archive number)d6084f90-caaf-11de-b769-000ea68e967b (OAI)
Note
Validerad; 2010; 20091106 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Jolsterå, R., Gunneriusson, L. & Forsling, W. (2010). Surface characterisation and modelling of olivine at alkaline conditions (ed.). Paper presented at Annual V.M. Goldschmidt Conference : 13/06/2010 - 18/06/2010. Geochimica et Cosmochimica Acta, 74(12/Suppl 1), A477
Open this publication in new window or tab >>Surface characterisation and modelling of olivine at alkaline conditions
2010 (English)In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 74, no 12/Suppl 1, p. A477-Article in journal, Meeting abstract (Other academic) Published
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-40752 (URN)ffee7018-09ac-45b8-a735-77f5fd20086a (Local ID)ffee7018-09ac-45b8-a735-77f5fd20086a (Archive number)ffee7018-09ac-45b8-a735-77f5fd20086a (OAI)
Conference
Annual V.M. Goldschmidt Conference : 13/06/2010 - 18/06/2010
Note
Godkänd; 2011; 20110124 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-30Bibliographically approved
Gunneriusson, L., Sandström, Å., Holmgren, A., Kuzmann, E., Kovacs, K. & Vertes, A. (2009). Jarosite inclusion of fluoride and its potential significance to bioleaching of sulphide minerals (ed.). Paper presented at . Hydrometallurgy, 96(1-2), 108-116
Open this publication in new window or tab >>Jarosite inclusion of fluoride and its potential significance to bioleaching of sulphide minerals
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2009 (English)In: Hydrometallurgy, ISSN 0304-386X, E-ISSN 1879-1158, Vol. 96, no 1-2, p. 108-116Article in journal (Refereed) Published
Abstract [en]

Incorporation of fluoride ions into the structure of jarosite, a common precipitate in bioleaching, was studied. Crystalline jarosite was synthesized in the presence of various concentrations of fluoride ions and characterized by spectroscopic- and chemical analysis.The results showed that substantial amounts of fluoride were sorbed to jarosite, increasing with pH and fluoride concentration. FTIR, XRD and Mössbauer analysis supported a structural incorporation of the fluoride. Due to the size similarity between fluoride and hydroxide ions, a probable mechanism is an exchange of hydroxide ions and fluoride ions within the jarosite, giving the composition KFe3(SO4)2(OH)6 - xFx(s). For the maximum concentration of fluoride used during synthesis, 200 mM, about 25% of the hydroxide ions were exchanged for fluoride ions. The mass of jarosite precipitated shown to be highly dependent on the fluoride concentration, with approximately half the yield using 200 mM potassium fluoride compared to in the absence of fluoride ions.To test the influence on toxicity of the incorporation of fluoride in jarosite, a bioleaching study was performed at 65 °C. A suspension of pyrite concentrate with 4% solid content (w/v) in the modified 9 K medium was bioleached under additions of potassium fluoride. The results indicated a higher tolerance for fluoride ions, as compared to earlier reported studies on fluoride toxicity during bioleaching.

National Category
Physical Chemistry Metallurgy and Metallic Materials Physical Chemistry
Research subject
Chemistry of Interfaces; Process Metallurgy; Physical Chemistry
Identifiers
urn:nbn:se:ltu:diva-10018 (URN)10.1016/j.hydromet.2008.08.012 (DOI)000262876100017 ()2-s2.0-58149203407 (Scopus ID)8c4e1240-bc82-11dd-a7c4-000ea68e967b (Local ID)8c4e1240-bc82-11dd-a7c4-000ea68e967b (Archive number)8c4e1240-bc82-11dd-a7c4-000ea68e967b (OAI)
Note
Validerad; 2009; 20081127 (lagu)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kovács, K., Kuzmann, E., Homonnay, Z., Vértes, A., Gunneriusson, L. & Sandström, Å. (2008). Mössbauer study of synthetic jarosites (ed.). Paper presented at . Hyperfine Interactions, 186(1-3), 69-73
Open this publication in new window or tab >>Mössbauer study of synthetic jarosites
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2008 (English)In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 186, no 1-3, p. 69-73Article in journal (Refereed) Published
Abstract [en]

57Fe Mössbauer spectroscopy and PXRD were used to study artificially prepared jarosites with the compositions of KFe3(SO4)2(OH)6 - x F x x = 0 - 1.6 PXRD measurements revealed single phase jarosite samples. All Mössbauer spectra taken at room temperature exhibit a quadrupole doublet corresponding to mineral jarosite. However, at low temperature where the mineral jarosite has a well resolved sextet, the synthetic jarosite even with x = 0 F -  content shows a relaxation transition. The spectra indicate that with increasing F -  concentration, the paramagnetic-antiferromagnetic transition temperature is decreasing. The results can be used in the analysis of artificial jarosites or those formed during biomineralization processes.

National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-7891 (URN)10.1007/s10751-008-9857-8 (DOI)000261061900009 ()2-s2.0-59849092777 (Scopus ID)65106f60-bc7e-11dd-a7c4-000ea68e967b (Local ID)65106f60-bc7e-11dd-a7c4-000ea68e967b (Archive number)65106f60-bc7e-11dd-a7c4-000ea68e967b (OAI)
Note
Validerad; 2008; 20081127 (lagu)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Lützenkirchen, J., Boily, J., Gunneriusson, L., Lövgren, L. & Sjöberg, S. (2008). Protonation of different goethite surfaces: unified models for NaNO3 and NaCl media (ed.). Paper presented at . Journal of Colloid and Interface Science, 317(1), 155-165
Open this publication in new window or tab >>Protonation of different goethite surfaces: unified models for NaNO3 and NaCl media
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2008 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 317, no 1, p. 155-165Article in journal (Refereed) Published
Abstract [en]

Acid–base titration data for two goethites samples in sodium nitrate and sodium chloride media are discussed. The data are modeled based on various surface complexation models in the framework of the multi site complexation (MUSIC) model. Various assumptions with respect to the goethite morphology are considered in determining the site density of the surface functional groups. The results from the various model applications are not statistically significant in terms of goodness of fit. More importantly, various published assumptions with respect to the goethite morphology (i.e., the contributions of different crystal planes and their repercussions on the “overall” site densities of the various surface functional groups) do not significantly affect the final model parameters within simple 1-pK approximations. The simultaneous fit of the chloride and nitrate data results in electrolyte binding constants, which are applicable over a wide range of electrolyte concentrations including mixtures of chloride and nitrate. Model parameters for the goethite sample with 90 m2/g specific surface area are in excellent agreement with parameters that were independently obtained by another group on different goethite titration data sets.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-3352 (URN)10.1016/j.jcis.2007.08.055 (DOI)000251283100019 ()2-s2.0-36048930175 (Scopus ID)12b5f370-c82d-11dc-b13a-000ea68e967b (Local ID)12b5f370-c82d-11dc-b13a-000ea68e967b (Archive number)12b5f370-c82d-11dc-b13a-000ea68e967b (OAI)
Note
Validerad; 2008; 20080121 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ruth, K. V., Kumpiene, J., Gunneriusson, L. & Holmgren, A. (2005). Changes in soil organic matter composition and quantity with distance to a nickel smelter: a case study on the Kola Peninsula, NW Russia (ed.). Paper presented at . Geoderma, 127(3-4), 216-226
Open this publication in new window or tab >>Changes in soil organic matter composition and quantity with distance to a nickel smelter: a case study on the Kola Peninsula, NW Russia
2005 (English)In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 127, no 3-4, p. 216-226Article in journal (Refereed) Published
Abstract [en]

The capacity of soils to absorb contamination depends on a number of factors, such as soil organic matter (SOM) that plays an essential role in adsorption of metal ions, especially in Podzols with their low content of clay minerals. Detailed analysis of SOM can provide information about the potential capacity of a soil to mobilise or immobilise contaminating substances, which in turn can be used to predict potential recovery of the soil ecosystem following heavy metal pollution. The purpose of this study was to learn how an increasing load of heavy metals (Cu and Ni) affects SOM content and structure, and which of the SOM functional groups are responsible for metal retention. The study area is located in the central part of the Kola Peninsula, south of Monchegorsk city and the nickel smelting complex ‘Severonickel’. The amount of total carbon in the soil decreased from 86% to 0.6% as the distance from the smelting complex decreased from 34 to 2 km. Functional groups of the SOM had a larger diversity in less polluted soils than in the soils located closer to the smelting complex. Carboxyl groups had a higher intensity of infra red (IR) bands in soils collected at the distance of 34–27 km than those located closer to the smelter. The most disturbed soil at the site closest to the smelter showed almost no presence of COOH groups. We conducted a laboratory experiment using soils from the least polluted sampling site to assess which SOM functional groups may be responsible for metal retention. Experimental contamination of the soil with the Cu/Ni solution resulted in an overall decrease in the absorbance for all studied functional groups within the measured range, except for COOH. This could be attributed both to changes in the structure of the SOM caused by its reaction with the contaminating substances, and to the leaching of some of the organic compounds from the soil during the experiment. Further studies are needed to better understand which functional groups in the SOM are active in the adsorption processes.

National Category
Other Environmental Engineering Physical Chemistry Physical Chemistry
Research subject
Waste Science and Technology; Chemistry of Interfaces; Physical Chemistry
Identifiers
urn:nbn:se:ltu:diva-8225 (URN)10.1016/j.geoderma.2004.12.010 (DOI)000230546600006 ()2-s2.0-21244471884 (Scopus ID)6b1fd430-ddec-11db-9cae-000ea68e967b (Local ID)6b1fd430-ddec-11db-9cae-000ea68e967b (Archive number)6b1fd430-ddec-11db-9cae-000ea68e967b (OAI)
Note
Validerad; 2005; 20070329 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Jarlbring, M., Gunneriusson, L. & Forsling, W. (2005). Characterisation of the protolytic properties of synthetic carbonate free fluorapatite (ed.). Paper presented at . Journal of Colloid and Interface Science, 285(1), 206-211
Open this publication in new window or tab >>Characterisation of the protolytic properties of synthetic carbonate free fluorapatite
2005 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 285, no 1, p. 206-211Article in journal (Refereed) Published
Abstract [en]

The acid/base surface properties of carbonate free fluorapatite (Ca 5(PO4)3F) have been characterised using high precision potentiometric titrations and surface complex modelling. Synthetic carbonate free fluorapatite was prepared and characterised by SEM, XRD, FT-IR and FT-Raman. The specific surface area was determined to be 17.7±1.2 m2g-1 with BET (N2 adsorption). The titrations were performed at 25±0.2°C, within the pH range 5.7-10.8, in 0.10 and 0.50 mol dm -3 NaNO3 ionic media. Experimental data were interpreted using the constant capacitance model and the software FITEQL 4.0. The surface equilibria: S1OH ⇄ S1O- + H+ lgβ-110s (int), S2OH ⇄ S2O- + H+ lgβ-101s (int) well describes the surface characteristics of synthetic fluorapatite. The equilibrium constants obtained were: lgβ-110s(int)=-6.33±0.05 and lgβ-101s(int)=-8.82±0.06 at I=0.10 moldm-3. At the ionic strength 0.50 mol dm-3, the equilibrium constants were slightly shifted to: lgβ-110s(int)=-6.43±0.05 and lgβ-101s(int)=-8.93±0.06. The number of active surface sites, Ns, was calculated from titration data and was found to be 2.95 and 2.34 sites nm-2 for the ionic strengths 0.10 and 0.50 mol dm-3, respectively. pHPZC or the IEP was found to be 5.7 from Z-potential measurements

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-9820 (URN)10.1016/j.jcis.2004.11.043 (DOI)000228434800028 ()2-s2.0-25144493541 (Scopus ID)881bee70-d865-11db-a1bf-000ea68e967b (Local ID)881bee70-d865-11db-a1bf-000ea68e967b (Archive number)881bee70-d865-11db-a1bf-000ea68e967b (OAI)
Note
Validerad; 2005; 20070322 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sundkvist, J.-E., Sandström, Å., Gunneriusson, L. & Lindström, B. (2005). Fluorine toxicity in bioleaching systems (ed.). In: (Ed.), Susan T. L. Harrison; D.E. Rawlings; Jochen Petersen (Ed.), Biohydrometallurgy: 16th International Biodrometallurgy Symposium IBS-2005, held in Cape Town, South Africa, September 25-29, 2005. Paper presented at International Biohydrometallurgy Symposium : 25/09/2005 - 29/09/2005 (pp. 19-28). Amsterdam: Elsevier
Open this publication in new window or tab >>Fluorine toxicity in bioleaching systems
2005 (English)In: Biohydrometallurgy: 16th International Biodrometallurgy Symposium IBS-2005, held in Cape Town, South Africa, September 25-29, 2005 / [ed] Susan T. L. Harrison; D.E. Rawlings; Jochen Petersen, Amsterdam: Elsevier, 2005, p. 19-28Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2005
National Category
Metallurgy and Metallic Materials Physical Chemistry
Research subject
Process Metallurgy; Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-27411 (URN)0da64e10-14d3-11dc-b9f0-000ea68e967b (Local ID)1-920051-17-1 (ISBN)0da64e10-14d3-11dc-b9f0-000ea68e967b (Archive number)0da64e10-14d3-11dc-b9f0-000ea68e967b (OAI)
Conference
International Biohydrometallurgy Symposium : 25/09/2005 - 29/09/2005
Note
Godkänd; 2005; 20070607 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
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