Removal of Fe(III) ions from dilute aqueous solutions by alginic acid‐enhanced ultrafiltration

Sanli, O.; Asman, G.

doi:10.1002/1097-4628(20000801)77:5<1096::aid-app17>3.3.co;2-6

Cited by 6 publications

(13 citation statements)

References 11 publications

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“…It has been shown that complexed uranium can be removed by UF with high retentions reported [14,15]. Considering that OM can be retained by UF to some extent [13] and influences the retention of metal ions [16,17], an investigation into the removal of uranium-OM complexes by UF would therefore be valuable. For the purpose of this study three types of OM, representative of compounds found in natural waters, were chosen as suitable for further exploration: HA, AA and TA.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

“…AA is known to be highly effective in the removal of metals from aqueous solutions [19,20,22], including uranium adsorption in wastewater treatment [23,24]. In fact the combination of AA with membrane processes has been found to lead to enhanced metal removal [16,17]. TA is a representative of plant polyphenols.…”

Section: Introductionmentioning

confidence: 99%

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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“…In turn, ultrafiltration has been classically employed to recover macromolecules, with molar masses of several thousands, from aqueous effluents. Thus, ultrafiltration membranes have been tested to recover metallic ions from aqueous solutions by adding macromolecules such as soluble polymers [10][11][12][13] and surfactants [14][15][16][17], which combine with the metals and enhance the separation. However, when dealing with these processes, a recovery step allowing the re-use of the surfactants or polymers is needed not only to decrease the operation costs associated with the additives but also to avoid discharges of organic material with the effluents containing the retained metals.…”

Section: Introductionmentioning

confidence: 99%

Non-enhanced ultrafiltration of iron(III) with commercial ceramic membranes

Bernat

Pihlajamäki

Fortuny

et al. 2009

Journal of Membrane Science

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“…Oxidation, pH adjustment or polymer assisted filtration can lead to the precipitation or complexation of metals and subsequent removal of the precipitate by MF or UF [19,132,114,127,71,38].…”

Section: Solute-solute Interaction and Retention By Mf And Ufmentioning

confidence: 99%

Xenobiotics Removal by Membrane Technology: An Overview

Semiao

Schäfer

2009

Environmental Pollution

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Small molecular weight xenobiotics are compounds of extreme concern in potable water applications due to their adverse human health and environmental effects. However, conventional water treatment processes cannot fully and systematically remove them due to their low concentrations in natural waters and wastewaters. Biological limitation to degrade such compounds is another cause for inefficient removal.Physical barriers like membranes possessing pore sizes smaller than the compounds to be removed emerged as a good solution. Nanofiltration and reverse osmosis proved to be quite effective for xenobiotics removal in potable water production in the Paris purification plant of Méry-sur-Oise. However, even these very narrow pore membrane processes may result in incomplete removal: xenobiotics retention is high but factors such as adsorption, size exclusion and charge repulsion affect unpredictably their retention. The water solutions complexity to be treated renders xenobiotics removal predictions even more difficult due to interactions between xenobiotics and compounds in water.Removal of xenobiotics by microfiltration and ultrafiltration is very low because adsorption on the membrane is the main retention mechanism. Combining those with other processes (e.g. activated carbon) can considerably improve xenobiotics removal.The least studied processes in xenobiotics removal are electrodialysis, membrane distillation and pervaporation. Electrodialysis removal of organic xenobiotics shows a breakthrough through the membrane possibly due to adsorption followed by diffusion. Membrane distillation presents high removal rates of xenobiotics due to the compounds low vapour pressure. For volatile organic xenobiotics or solutions of trace amounts both membrane distillation and pervaporation can be used, xenobiotics interaction with the membrane being the key factor.In this book chapter a thorough synopsis of current knowledge on xenobiotics removal is presented and balanced with recent fundamental studies of underlying mechanisms, informing both the practitioner regarding membrane capabilities for xenobiotics removal and the researcher with the current state-of-art.

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Removal of Fe(III) ions from dilute aqueous solutions by alginic acid‐enhanced ultrafiltration

Cited by 6 publications

References 11 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

Non-enhanced ultrafiltration of iron(III) with commercial ceramic membranes

Xenobiotics Removal by Membrane Technology: An Overview

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