Selective Concentration of Uranium from Seawater by Nanofiltration

Favre‐Réguillon, Alain; Lebuzit, Gérard; Foos, and Jacques; Guy, Alain; Draye, Micheline; Lemaire, Marc

doi:10.1021/ie030157a

Cited by 69 publications

(39 citation statements)

References 22 publications

(24 reference statements)

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“…Ca 2+ (1.00 Å) has been found to be selectively favoured by AA over other metal ions [22]. Considering that the smallest species of uranium is found in the form of UO 2 2+ with a radius of 1.8 Å [30] and that at more alkaline conditions the uranium species are even larger (4.85 Å) [51], complexation with AA would be less favoured in the neutral and alkaline pH range. HA has an ability to interact with metal ions [27] as it contains voids which can trap and retain other components [27].…”

Section: Influence Of Organic Matter On Uranium Depositionmentioning

confidence: 98%

Impact of organic matter and speciation on the behaviour of uranium in submerged ultrafiltration

Semiao

Rossiter

Schäfer

2010

Journal of Membrane Science

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a b s t r a c tInfluence of organic matter (OM) on uranium removal mechanisms by ultrafiltration (UF) over a pH range of 3-11 was investigated. Humic, alginic and tannic acid were used as OM. It was found that uranium adsorbed strongly to the membrane while retention by size exclusion did not occur. Adsorption was dependent on pH and type of OM used. Speciation predictions performed using Visual Minteq explain some of these results. In the absence of OM, uranium primarily adsorbed to the membrane at pH 5 and 7 where UO 2 OH + and UO 2 CO 3 were the dominant species. In the presence of humic acid (HA), uranium adsorption increased in the acidic range, especially at pH 3 (from 11% to 74%) due to the complexation. The structure of alginic acid (AA) did not favour complexation with uranium and therefore did not have a significant influence on its behaviour in UF. The exception was at pH 3 where adsorption increased from 11% to 52%. At this pH no charge repulsion between the uranium species and the AA occurs and complexation is favoured. The highest effect on uranium adsorption was obtained in the presence of tannic acid (TA) at pH 10 and 11 where adsorption increased from 20% up to 100%. Uranium is most likely forming complexes with the gallic acid fraction of the dissociated TA.

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Section: Influence Of Organic Matter On Uranium Depositionmentioning

confidence: 98%

Impact of organic matter and speciation on the behaviour of uranium in submerged ultrafiltration

Semiao

Rossiter

Schäfer

2010

Journal of Membrane Science

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“…NF and RO have been proven to effectively remove both contaminants from drinking water (Raff and Wilken, 1999;Lhassani et al, 2001;Favre-Réguillon et al, 2003, 2008Tahaikt et al, 2007Tahaikt et al, , 2008Rossiter et al, 2010b). The unique possibility of replacing various treatment processes by a single technique makes NF/RO a very attractive and promising option for the drinking water industry.…”

Section: Chemical Characteristics Of Fluoride and Uraniummentioning

confidence: 99%

Removal of fluoride and uranium by nanofiltration and reverse osmosis: A review

2014

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“…The increase of ionic strength, for example, decreases retention of charged solutes due to charge shielding between the membrane and the contaminant, i.e. Donnan exclusion mechanism [60,[66][67][68]. Nghiem et al [60] showed that the addition of calcium ions decreased retention of charged pharmaceuticals even more dramatically than an increase in NaCl concentration.…”

Section: Retention Of Micropollutants By Polymeric Membranesmentioning

confidence: 99%

Micropollutant sorption to membrane polymers: A review of mechanisms for estrogens

Schäfer

Akanyeti

Semiao

2011

Advances in Colloid and Interface Science

247

140

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Organic micropollutants such as estrogens occur in water in increasing quantities from predominantly anthropogenic sources. In water such micropollutants partition not only to surfaces such as membrane polymers but also to any other natural or treatment related surfaces. Such interactions are often observed as sorption in treatment processes and this phenomenon is exploited in activated carbon filtration, for example. Sorption is important for polymeric materials and this is used for the concentration of such micropollutants for analytical purposes in solid phase extraction. In membrane filtration the mechanism of micropollutant sorption is a relatively new discovery that was facilitated through new analytical techniques. This sorption plays an important role in micropollutant retention by membranes although mechanisms of interaction are to date not understood. This review is focused on sorption of estrogens on polymeric surfaces, specifically membrane polymers. Such sorption has been observed to a large extent with values of up to 1.2 ng/cm(2) measured. Sorption is dependent on the type of polymer, micropollutant characteristics, solution chemistry, membrane operating conditions as well as membrane morphology. Likely contributors to sorption are the surface roughness as well as the microporosity of such polymers. While retention-and/or reflection coefficient as well as solute to effective pore size ratio-controls the access of such micropollutants to the inner surface, pore size, porosity and thickness as well as morphology or shape of inner voids determines the available area for sorption. The interaction mechanisms are governed, most likely, by hydrophobic as well as solvation effects and interplay of molecular and supramolecular interactions such as hydrogen bonding, π-cation/anion interactions, π-π stacking, ion-dipole and dipole-dipole interactions, the extent of which is naturally dependent on micropollutant and polymer characteristics. Systematic investigations are required to identify and quantify both relative contributions and strength of such interactions and develop suitable surface characterisation tools. This is a difficult endeavour given the complexity of systems, the possibility of several interactions taking place simultaneously and the generally weaker forces involved.

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Selective Concentration of Uranium from Seawater by Nanofiltration

Cited by 69 publications

References 22 publications

Impact of organic matter and speciation on the behaviour of uranium in submerged ultrafiltration

Impact of organic matter and speciation on the behaviour of uranium in submerged ultrafiltration

Removal of fluoride and uranium by nanofiltration and reverse osmosis: A review

Micropollutant sorption to membrane polymers: A review of mechanisms for estrogens

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