Removal of Co2+, Sr2+ and Cs+ from aqueous solution by phosphate-modified montmorillonite (PMM)

Ma, Bin; Oh, Sanghwa; Shin, Won Sik; Choi, Sang-June

doi:10.1016/j.desal.2011.03.072

Cited by 178 publications

(67 citation statements)

References 49 publications

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“…The maximum adsorption of Sr at 318 K on the composite magnetic nanoparticles was 23.04 mg Sr/g CuFe2O4 (calculated based on the Langmuir isotherm). This adsorption capacity is higher than several of the listed adsorbents, including ammonium molybdophosphate polyacrylonitrile (16.6 mg•g −1 ) [13], montmorillonite (13.3 mg•g −1 ) [8], phosphatemodified montmorillonite (12.6 mg•g −1 ) [8], magnetic Fe3O4 particle-modified sawdust (12.6 mg•g −1 ) [41], and hydrous ferric oxide (6.9 mg•g −1 ) [21]. The negative change in the adsorption standard free energy (∆G • = −5.68, −6.45, and −7.23 kJ·mol −1 at 298, 308, and 318 K, respectively) shows that the adsorption reaction is a spontaneous process [37].…”

Section: Comparison Of the Sr Adsorption Capacity With Other Adsorbentsmentioning

confidence: 99%

Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

You

Zhang

et al. 2016

Water

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Novel composite magnetic nanoparticles (CuFe 2 O 4 ) were synthesized from industrial sludge by acid leaching, chemical exchange, and ferrite processes in the laboratory. For the first time, these products were applied to investigate the Sr adsorption kinetics and the related thermodynamics in seawater. Rapidly enhanced Sr adsorption was observed when the solution pH changed from 2.61 to 10.25. The maximum adsorption capacity was 23.04 mg·g −1 at 318 K (pH 10.25). Sr adsorption decreased with the increase of the ionic strength from 0.01 to 0.5 mol·L −1 at pH 2.61-pH 10.25, indicating that the outer-sphere mechanism was involved in the Sr adsorption at the pH interval. This reaction is spontaneous and endothermic, as indicated by the negative change in the standard free energy (∆G • = −5.68, −6.45, and −7.23 kJ·mol −1 at 298, 308, and 318 K, respectively) and positive ∆H • value (2.11 kJ·mol −1 ). The positive ∆S • (9.38 mol −1 ·K −1 ) further confirms that the randomness increased at the solid-solution interface during adsorption. These new results indicate that the composite magnetic nanoparticles can be used for the removal of radiogenic 90 Sr nuclide in seawater that was released after the 3/11 earthquake offshore of Japan.

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Section: Comparison Of the Sr Adsorption Capacity With Other Adsorbentsmentioning

confidence: 99%

Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

You

Zhang

et al. 2016

Water

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“…In contrast, natural clay minerals which have also been used as adsorbents for radionuclides (e.g. Cs + , Sr 2+ , Co 2+ ) 10,11 and other hazardous contaminants are readily available, low cost, and therefore suitable for scale-up. In particular, montmorillonite, a member of the smectite clays composed of two tetrahedral silica sheets surrounding a central octahedral sheet of alumina in a 2-1 layered structure, has been extensively adopted as a very efficient Cs + adsorbent with an adsorption capacity in the range 57-104 mg/g [10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

“…Cs + , Sr 2+ , Co 2+ ) 10,11 and other hazardous contaminants are readily available, low cost, and therefore suitable for scale-up. In particular, montmorillonite, a member of the smectite clays composed of two tetrahedral silica sheets surrounding a central octahedral sheet of alumina in a 2-1 layered structure, has been extensively adopted as a very efficient Cs + adsorbent with an adsorption capacity in the range 57-104 mg/g [10][11][12][13] . This relatively high adsorption capacity results from favourable structural properties including high cation exchange capacity (CEC), large surface area, high swelling capacity, good chemical and mechanical stability 10,14 .…”

Section: Introductionmentioning

confidence: 99%

Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs⁺ adsorption capacity and selective recovery by flotation

et al. 2017

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The selective capture of mobile radioactive nuclides, such as 137 Cs + , is crucial to the clean-up and remediation of contaminated environments. While remediation remains a challenging task, the current study considers novel organo-clay composites containing potassium copper hexacyanoferrate (KCuHCF) as a viable option for large-scale clean-up. A threestep synthesis has been demonstrated whereby pristine montmorillonite clay was readily modified to incorporate KCuHCF nanoparticles for enhanced and selective Cs + removal from aqueous environments. Alkyldiamine (DT) was used as an organic modifier to intercalate the clay and provided chelating sites to anchor copper onto the clay matrix, from which KCuHCF nanoparticles were subsequently grown in-situ via the coordination of hexacyanoferrate precursors with the immobilized copper ions. The organo-clay-HCF composite particles exhibited a superior Cs + adsorption capacity (qm = 206 mg/g), twice that of the pristine clay. The enhanced performance also extended to high Cs + selectivity in seawater, with the organo-clay-HCF composites demonstrating Cs + selectivity values in excess of 10 5 mL/g, two orders of magnitude greater than the pristine clay. Organo modification of the clay particles reduced the particle wettability, thus facilitating the separation of Cs-loaded composite particles from aqueous environments by collector-less flotation. Batch flotation experiments showed recovery efficiencies of the Cs-loaded composite particles of up to 90%, which was in great contrast to the low recovery of less than 15% for the Cs-loaded pristine montmorillonite. The current study provides a new concept for the treatment of contaminated aqueous environments.

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“…Dolomite powder has been used for adsorption of Sr 29 (II) and Ba(II) from aqueous solution [6]. Ma et al applied 30 montmorillonite modified with phosphate (PMM) to remove Co 31 (II), Sr(II) and Cs(I) from aqueous solution [7]. 32 In the recent years, special attention has been focused on the 33 use of chitosan (CTS) as potential adsorbent for removal of heavy 34 metals from wastewater [8,9].…”

Section: Introductionmentioning

confidence: 99%

Efficient static and dynamic removal of Sr(II) from aqueous solution using chitosan ion-imprinted polymer functionalized with dithiocarbamate

Liu

et al. 2015

Journal of Environmental Chemical Engineering

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Removal of Co2+, Sr2+ and Cs+ from aqueous solution by phosphate-modified montmorillonite (PMM)

Cited by 178 publications

References 49 publications

Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs⁺ adsorption capacity and selective recovery by flotation

Efficient static and dynamic removal of Sr(II) from aqueous solution using chitosan ion-imprinted polymer functionalized with dithiocarbamate

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Removal of Co2+, Sr2+ and Cs+ from aqueous solution by phosphate-modified montmorillonite (PMM)

Cited by 178 publications

References 49 publications

Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs+ adsorption capacity and selective recovery by flotation

Efficient static and dynamic removal of Sr(II) from aqueous solution using chitosan ion-imprinted polymer functionalized with dithiocarbamate

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Product

Resources

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Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs⁺ adsorption capacity and selective recovery by flotation