Adsorption behavior of metal ions by amidoxime chelating resin

Rivas, Bernabé L.; Maturana, H. A.; Villegas, Sandra

doi:10.1002/1097-4628(20000829)77:9<1994::aid-app15>3.0.co;2-p

“…PANSIL was also very effective at treating the synthetic groundwater (also shown in Figure 9c). The amidoxime coating on PANSIL is known to act as a bidentate ligand for uranyl cations [9], which are the prevalent specie in acidic conditions (see Figure 2). However in the bicarbonate buffered synthetic groundwater system at ~ pH 7.5 the geochemical modelling indicates that the predominant uranyl species are either neutral or anionic, with only anionic species significant above pH 8.…”

Section: Resultsmentioning

confidence: 99%

“…The lone pairs of electrons on the amino nitrogen and the oxime oxygen are donated to the positive metal centre to form a five-membered ring including the metal (such rings are noted for their stability due to minimal strain). The oxime oxygen can undergo metal-assisted deprotonation [9] further increasing the stability of the ring at intermediate pH. Figure 1 shows electron micrographs of the three materials.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

Barton

¹

,

Stewart

²

,

Morris

³

et al. 2004

Journal of Hazardous Materials

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Three materials that are designed to treat uranium-contaminated water were investigated.These are a cation exchange resin, IRN77, an anion exchange resin, Varion AP, and a recently developed material called PANSIL (quartz sand coated with 2% amidoxime resin by wt.). The reaction rate, capacity, and effective pH range of the three materials are reported. The capacity and conditional distribution coefficient in neutral, uranyl contaminated synthetic groundwater containing carbonate are also reported. The suitability of each material for treating uraniumcontaminated groundwaters using a permeable reactive barrier approach is then discussed.All three materials react rapidly in the pH range 5-7, reaching equilibrium in less than 4 hours at ~23°C. The unconditioned cation exchange resin removed 8 g UO 2 2+ per kg of resin from neutral synthetic groundwater containing 30 mg/l of UO 2 2+ , but a lower capacity is anticipated in groundwater with either higher ionic strength or lower UO 2 2+ concentrations. It operates by first acidifying the solution, then sorbing UO 2 2+ , and can release UO 2 2+ when its buffering capacity has been exhausted. The anion exchange resin is very effective at removing anionic uranyl carbonate species from solutions with a pH above 5, with good specificity. Up to 50 g/kg of uranium is removed from contaminated groundwater at neutral pH. PANSIL is effective at sequestering cationic and neutral uranyl species from solutions in the pH range 4.5 to 7.5, with very good specificity. The capacity of PANSIL is pH dependent, increasing from about 0.4 g/kg at pH 4.5, to about 1 g/kg at pH 6 and 1.5 g/kg around pH 7.5. In neutral groundwater containing carbonate, both the anion exchange resin and PANSIL exhibit conditional distribution coefficients exceeding 1470 ml/g, which is about an order of magnitude higher than comparable reactive barrier materials reported in the literature.

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“…Amidoxime resin (the active coating on PANSIL) is reported to be highly selective for large divalent cations [9,12,13]. Therefore a second isotherm determination was undertaken (at approximately the same pH as the first isotherm) to investigate the specificity of PANSIL for UO 2 2+ in the presence of equimolar Pb…”

Section: Methodsmentioning

confidence: 99%

05/02504 Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

2005

Fuel and Energy Abstracts

0

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Three materials that are designed to treat uranium-contaminated water were investigated.These are a cation exchange resin, IRN77, an anion exchange resin, Varion AP, and a recently developed material called PANSIL (quartz sand coated with 2% amidoxime resin by wt.). The reaction rate, capacity, and effective pH range of the three materials are reported. The capacity and conditional distribution coefficient in neutral, uranyl contaminated synthetic groundwater containing carbonate are also reported. The suitability of each material for treating uraniumcontaminated groundwaters using a permeable reactive barrier approach is then discussed.All three materials react rapidly in the pH range 5-7, reaching equilibrium in less than 4 hours at ~23°C. The unconditioned cation exchange resin removed 8 g UO effective at sequestering cationic and neutral uranyl species from solutions in the pH range 4.5 to 7.5, with very good specificity. The capacity of PANSIL is pH dependent, increasing from about 0.4 g/kg at pH 4.5, to about 1 g/kg at pH 6 and 1.5 g/kg around pH 7.5. In neutral groundwater containing carbonate, both the anion exchange resin and PANSIL exhibit conditional distribution coefficients exceeding 1470 ml/g, which is about an order of magnitude higher than comparable reactive barrier materials reported in the literature.

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“…Bilba et al [38] reported that PAO had no affinity for most common cations in aqueous solutions, such as Na + , K + , Ca 2+ , and Mg 2+ . Rivas et al [39] prepared PAO-chelating resin that exhibited excellent affinity for UO 2 2+ in the presence of other metal ions. The salinity of wastewater is usually > 0.4 g/kg; for seawater the usual salinity is 36-38 g/kg.…”

Section: +mentioning

confidence: 99%

Poly(amidoxime)-reduced graphene oxide composites as adsorbents for the enrichment of uranium from seawater

Shao

¹

,

Li

²

,

Wang

³

2014

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The development of efficient materials for high extraction of uranium (UO 2 2+ ) from seawater is critical for nuclear energy. Poly(amidoxime)-reduced graphene oxide (PAO/rGO) composites with excellent adsorption capability for UO 2 2+ were synthesized by in situ polymerization of acrylonitrile monomers on GO surfaces, followed by amidoximation treatment with hydroxylamine. The adsorption capacities of PAO/rGO composites for UO 2 2+ reached as high as 872 mg/g at pH 4.0. The excellent tolerance of these composites for high salinity and their regeneration-reuse properties can be applied in the nuclear-fuel industry by high extraction of trace UO 2 2+ ions from seawater.

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Adsorption behavior of metal ions by amidoxime chelating resin

Cited by 60 publications

References 14 publications

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

05/02504 Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

Poly(amidoxime)-reduced graphene oxide composites as adsorbents for the enrichment of uranium from seawater

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