An ATR-FTIR study of sulphate sorption on magnetite; rate of adsorption, surface speciation, and effect of calcium ions

Roonasi, Payman; Holmgren, Allan

doi:10.1016/j.jcis.2008.12.080

Cited by 66 publications

(45 citation statements)

References 22 publications

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“…Magnetite was synthesized as previously described [3,20,21]. The small magnetite particles implied a high surface area (97.7 m 2 /g), which is advantageous for spectroscopic measurements and these particles were used as a model system for magnetite from the iron ore.…”

Section: Materials and Reagentsmentioning

confidence: 99%

“…The cell was connected to a 250 ml reservoir containing 150 ml solution via Viton tubings and the solutions were circulated through the cell at a rate of 5 ml/min (for further details, see Ref. [3]). All experiments were performed at room temperature and the reservoir was protected from air by a flow of argon.…”

Section: Instrumentation and Experimental Set Upmentioning

confidence: 99%

“…Thus, it is important to reduce the adsorption of this collector in order to further improve the strength of the pellets. Although the chemical structure of the collector is unspecified by the manufacturer, from NMR and IR spectra of this compound it was clear that the collector contains a number of carbonyl groups, double bond(s), methyl (CH 3 ) and methylene (CH 2 ) entities. In this study we have used sodium oleate as a model collector molecule.…”

Section: Introductionmentioning

confidence: 99%

“…Attenuated Total Reflection (ATR) infrared spectroscopy was utilized, a technique that has been widely applied to study surface adsorption from aqueous solution onto finely dispersed solids including metal oxides e.g. [2][3][4][5][6][7][8]. ATR spectroscopy has also been used to study surface reactions related to flotation [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…This advantage not only allows one to acquire information regarding the nature of the species, but also the rate of adsorption can be studied in situ i.e. in real time [3,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Roonasi

Yang

Holmgren

2010

Journal of Colloid and Interface Science

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Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy Attenuated Total Reflection (ATR) IR spectroscopy was utilized to monitor adsorption of sodium oleate and sodium silicate onto synthetic magnetite at pH = 8.5, both individually and in a competitive manner.Oleate was adsorbed within a concentration range of 0.01-0.5 mM. It was observed that adsorption of oleate increased linearly with increasing concentration of oleate in solution up to a concentration of 0.1 mM. The infrared spectrum of oleate showed a broad single band at 1535 cm À1 assigned to the asymmetric stretching vibration of carboxylate, implying chemisorption of oleate to the magnetite surface. The kinetics of oleate adsorption followed a pseudo first-order reaction with an apparent rate constant of k 1 = 0.030 ± 0.002 min À1. Competitve adsorption of silicate and oleate was performed either by adding silicate solution to a magnetite film initially equilibrated with 0.1 mM oleate or adding oleate solution to magnetite treated with silicate solutions in the concentration range 0.1-5 mM. It was shown that silicate, within reasonable time, had only minor effect on the amount of oleate already adsorbed on magnetite. On the other hand, oleate did not efficiently compete with silicate if the latter substance was already adsorbed on the iron oxide.

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Section: Materials and Reagentsmentioning

confidence: 99%

Section: Instrumentation and Experimental Set Upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This advantage not only allows one to acquire information regarding the nature of the species, but also the rate of adsorption can be studied in situ i.e. in real time [3,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Roonasi

Yang

Holmgren

2010

Journal of Colloid and Interface Science

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Kinetics, equilibrium and thermodynamic studies on the adsorptive removal of nickel, cadmium and cobalt from wastewater by superparamagnetic iron oxide nanoadsorbents

Nassar

2011

Can J Chem Eng

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Because of its unique properties, such as specific functionality and large specific surface area, iron oxide nanoadsorbents had showed potential for energy and environmental applications. This work investigated the adsorptive removal of different metal ions from wastewater by superparamagnetic iron oxide nanoadsorbents (Fe 3 O 4 ). Batch-adsorption technique was employed to assess the kinetic behaviour and adsorption equilibrium of cadmium, cobalt and nickel. Accordingly, the effect of the following variables on the adsorption reaction was tested, namely: solution pH, contact time and temperature. Metal ion adsorption was found to be highly pH dependent with a maximum uptake achieved around pH 5.5. Kinetic studies showed that adsorption was fast and equilibrium was achieved in less than 60 min. The external mass transfer kinetic model was applied to the experimental results and provided reasonable overall volumetric mass transfer coefficients. Adsorption isotherms were determined and appropriately described by the Freundlich and Langmuir models, with a better fit to the Freundlich model. The amount of metal ion adsorbed increased as the temperature increased, suggesting an endothermic adsorption process. The thermodynamics studies indicated that the adsorption process was spontaneous and endothermic in nature.

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Reactive Adsorption of NO₂ at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons

Bashkova

Bandosz

2011

ChemSusChem

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Adsorption of NO(2) and retention of NO (the product of NO(2) reduction by carbon) on iron-containing materials prepared from polystyrenesulfonic acid-co-maleic acid iron salt were studied. The surface of the materials was characterized using nitrogen adsorption, XRD, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and FTIR spectroscopy, and thermogravimetric analysis (TGA). The results showed the positive effects of the pore volume and well-dispersed iron species (Fe(2)O(3), FeSO(4), and FeS) on the performance of carbons as NO(2) adsorbents at room temperature. The retention of NO(2) on the carbon surface takes place either through its reduction to NO by carbon and/or by Fe(2)O(3), FeSO(4), and FeS, or through its reaction with Fe(2)O(3) and/or Fe(OH)(3), leading to the formation of Fe(NO(3))(3). The retention of NO is enhanced on carbons containing iron in the form of α-FeOOH, α-Fe(2)O(3), or γ-FeOOH. The best performance was found on the carbon with α-Fe(2)O(3). Dispersion and the particle size of iron compounds on the carbon surface affect both the adsorption/reduction process of NO(2) and the retention process of NO.

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An ATR-FTIR study of sulphate sorption on magnetite; rate of adsorption, surface speciation, and effect of calcium ions

Cited by 66 publications

References 22 publications

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Kinetics, equilibrium and thermodynamic studies on the adsorptive removal of nickel, cadmium and cobalt from wastewater by superparamagnetic iron oxide nanoadsorbents

Reactive Adsorption of NO₂ at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons

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An ATR-FTIR study of sulphate sorption on magnetite; rate of adsorption, surface speciation, and effect of calcium ions

Cited by 66 publications

References 22 publications

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Kinetics, equilibrium and thermodynamic studies on the adsorptive removal of nickel, cadmium and cobalt from wastewater by superparamagnetic iron oxide nanoadsorbents

Reactive Adsorption of NO2 at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons

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Product

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About

Reactive Adsorption of NO₂ at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons