Polyelectrolyte‐assisted removal of metal ions with ultrafiltration

Rivas, Bernabé L.; Pereira, Eduardo; Cid, Rocío; Geckeler, Kurt E.

doi:10.1002/app.21424

Cited by 57 publications

(40 citation statements)

References 37 publications

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“…2-Acrylamidoglycolic acid (AGA) refers to a class of acrylamides containing -OH,-COOH and -CONH-functional groups that shows excellent selectivity in separating apatite from siliceous gangue [11]. A number of copolymers have also been recognized to have ability to respond to several stimuli [12] and to recover metal ions [13][14]. Taking in mind all of these fascinating applications of acrylamidoglycolic acid (AGA) and guar gum, an attempt has been made to graft acrylamidoglycolic acid (AGA) onto guar gum.…”

Section: Introductionmentioning

confidence: 99%

Graft Copolymer (Guar Gum-G-Poly 2-Acrylamidoglycolic Acid): Synthesis, Swelling and Flocculation Behaviors

Pandey¹

2017

IJBBMB

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Abstract:The present paper reports the modification of guar gum through the grafting of 2-acrylamidoglycolic acid by free radical polymerization using an efficient potassium peroxydiphosphate/thioacetamide redox system in nitrogen atmosphere. The reaction conditions for maximum grafting have been optimized by varying the reaction variables including the concentration of 2-acrylamidoglycolic acid (5.3×10-2 mol dm ), guar gum (1 g dm −3 ) along with time duration (150 min) and temperature (35°C). Water swelling capacity and flocculation and studies of synthesized graft copolymer have been performed with respect to the parent polymer. The graft copolymer has been characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis.

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Section: Introductionmentioning

confidence: 99%

Graft Copolymer (Guar Gum-G-Poly 2-Acrylamidoglycolic Acid): Synthesis, Swelling and Flocculation Behaviors

Pandey¹

2017

IJBBMB

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“…This method is known as the liquid-phase polymer-based retention (LPR) technique [12][13][14][15][16][17][18][19][20][21][22]. In the LPR, a water-soluble polymer solution and metal ion solution are contacted on the feed-side in a filtration system.…”

Section: Introductionmentioning

confidence: 99%

Removal of Metal Ions From Bío Bío River Water by Liquid-Phase Polymer-Based Retention Technique

Pereira

Homper

Sánchez

et al. 2015

J. Chil. Chem. Soc.

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Water-soluble poly(2-acrylamidoglycolic acid) (PAAG) was synthesized by radical polymerization and characterized by FTIR spectroscopy and potentiometric titration. Subsequently, this polymer was used as extracting reagent of metal ions using LPR technique, through washing and enrichment methods. By the washing method, the selective retention (100 %) of Al 3+ was obtained at pH 2.36. The removal of monovalent and divalent ions was maximum for all the metal ions at pH 5. The maximum retention capacity of some metal ions by PAAG was studied by enrichment method using water of Bío Bío river containing metal ions. The higher retention percentage for Al 3+ ion indicates that PAAG could be used as an extracting reagent for Al 3+ ions from Bío Bío river samples.

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“…If the pH is strongly acidic and the Cr(VI) ions are highly concentrated, the chromium ions exist as dichromate The most common methods developed to remove Cr(VI), and Cr(III) ions from polluted solutions are reduction and precipitation 9 , adsorption 10 , and ion exchange 11,12 . Membrane technologies allow for reverse osmosis, ultrafiltration, nanofiltration, dialysis, diffusion dialysis, Donnan dialysis, membrane electrolysis, and electrodialysis 4,12-14 (liquid, emulsified and supported) 13,15,16 . However, it is difficult to eliminate the oxyanions Cr(VI) and the Cr(III) ions selectively from the water.…”

Section: Introductionmentioning

confidence: 99%

“…Membrane technologies allow for reverse osmosis, ultrafiltration, nanofiltration, dialysis, diffusion dialysis, Donnan dialysis, membrane electrolysis, and electrodialysis 4,12-14 (liquid, emulsified and supported) 13,15,16 . However, it is difficult to eliminate the oxyanions Cr(VI) and the Cr(III) ions selectively from the water.…”

Section: Introductionmentioning

confidence: 99%

Functional Ion Membranes Supported Inside Microporous Polypropylene Membranes to Transport Chromium Ions: Determination of Mass Transport Coefficient

Tapiero

Rivas

Sánchez

2014

J. Chil. Chem. Soc.

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Polypropylene (PP) membranes incorporating interpenetrating polymer networks of poly [(ar-vinylbenzyl) trimethylammonium chloride](P(ClVBTA)) and poly[sodium (styrenesulfonate)] P(SSNa) were modified via an "in-situ" radical polymerization synthesis inside the pores. The modified polypropylene membranes were characterized using SEM, ATR/FTIR, DRX, TGA, and Donnan dialysis for the transport of chromium ions. The modified membranes exhibited a percent modification between 2.5% and 4.0% in weight gain and a hydrophilic character with a water uptake capacity between 15% and 20%. The mass transport coefficient was determined using the non-linear fit of the experimental data to the exponential equation. Hexavalent chromium ions were efficiently transported by the modified membranes containing P(ClVBTA). At pH 3.0, the M4Cl.PEI (11.0×10 -6 m s -1 ), and at pH 9.0, the M3Cl (14.4×10 -6 m s -1 ) could transport hexavalent chromium ions efficiently using a 1 mol L -1 NaCl extraction agent. In the same way, the transport of trivalent chromium could be performed using membranes modified with P(SSNa). At pH 3.0 and 4.0×10 -2 mol L -1 trivalent chromium in the food chamber, the M9Na.PVA (16.3×10 -6 m s -1 ) performed efficient transport using 1×10 -3 mol L -1 HNO 3 as the extraction agent.Keywords: interpenetrating polymer network, membranes, Donnan dialysis, chromium, ion exchange, and polypropylene. INTRODUCTIONEnvironmental pollution of water, soil, and air is a serious problem when it includes oxyanions. Some oxyanion water-contaminating species employed in industry are chromate, arsenate, permanganate, hydrogen selenite, and selenate. A particular case is the derivatives of the chromium oxyanions. Chromium ions have two oxidation states in the water, for example, the trivalent chromium Cr(III) and hexavalent chromium Cr(VI).Cr(VI) produces the oxyanion (chromate) and the polyoxyanion (dichromate). These oxyanions are the more toxic ionic species and cause serious health problems such as cancer. The toxicity depends on the concentration and the exposure period 1,2 . Cr(VI) oxyanions are water-soluble across all pH ranges and accumulate well in biological systems (bioassimilable), and their speciation depends on the pH and concentration. If the pH is strongly acidic and the Cr(VI) ions are highly concentrated, the chromium ions exist as dichromate The most common methods developed to remove Cr(VI), and Cr(III) ions from polluted solutions are reduction and precipitation 9 , adsorption 10 , and ion exchange 11,12 . Membrane technologies allow for reverse osmosis, ultrafiltration, nanofiltration, dialysis, diffusion dialysis, Donnan dialysis, membrane electrolysis, and electrodialysis 4,12-14 (liquid, emulsified and supported) 13,15,16 . However, it is difficult to eliminate the oxyanions Cr(VI) and the Cr(III) ions selectively from the water. The improvement of the removal methods and the production of new functional polymer materials are very useful in the development of new technologies for removal, retention, an...

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Polyelectrolyte‐assisted removal of metal ions with ultrafiltration

Cited by 57 publications

References 37 publications

Graft Copolymer (Guar Gum-G-Poly 2-Acrylamidoglycolic Acid): Synthesis, Swelling and Flocculation Behaviors

Graft Copolymer (Guar Gum-G-Poly 2-Acrylamidoglycolic Acid): Synthesis, Swelling and Flocculation Behaviors

Removal of Metal Ions From Bío Bío River Water by Liquid-Phase Polymer-Based Retention Technique

Functional Ion Membranes Supported Inside Microporous Polypropylene Membranes to Transport Chromium Ions: Determination of Mass Transport Coefficient

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