Unloaded polyether type polyurethane foams as solid extractants for trace elements

Palágyi, Š.; Braun, Tibor

doi:10.1007/bf02037481

Cited by 16 publications

(8 citation statements)

References 56 publications

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“…Thus, in the extraction media of pH <1, the interaction of the complexed iron (III) phenolate complex speciesis easily proceeded with the protonated ether group of the PUF. Based on these data and the results reported on the retention of AuCl 4 by PUF [29], a sorption mechanism involving a weak base anion ion exchange and/or solvent extraction of iron (III) phenolate complex [Fe(phenolate) 6 ] 3by the protonated ether (-CH 2 -HO + -CH 2 -) oxygen linkage of the PUF as a ternary complex ion associate is most likely proceeded [26][27][28][29][30]…”

Section: Retention Profile Of Phenols From Aqueous Solution Onto Ironmentioning

confidence: 79%

“…Solid PUF concentrates inorganic and organic substances from different media by phase distribution mechanism rather than adsorption [29,30]. The membrane-like structure of PUF, together with efficient aero-and hydrodynamic characteristics offer high concentrating ability and high flow rate compared to other solid supports [30]. The nonselective sorption characteristic of the PUF has been rendered more selective by controlling the experimental conditions.…”

Section: Resultsmentioning

confidence: 99%

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Retention Profile and Selective Separation of Trace Concentrations of Phenols from Water onto Iron(III) Physically Loaded Polyurethane Foam Solid Sorbent: Kinetics and Thermodynamic Study

Ms¹,

Hamza²,

Alwael³

et al. 2014

J Chromatogr Sep Tech

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Phenols are included in the list of potential toxins for motor neurons. Thus, fast and selective method for removal of phenols has been developed. The method was based upon the extraction of iron (III) phenolate complex anions [Fe(phenolate) 6 ] 3by tri-n-butylphosphine (TBP)-plasticized iron(III) immobilized polyurethane foam (PUF) from the test aqueous solution adjusted to pH≈1 followed by subsequent formation of ternary ion association complex of these species with the protonated urethane and/or ether linkages on the PUF solid phase extractor (SPE). The rate of removal of phenols from the aqueous solution by TBP plasticized iron (III) immobilized PUF were studied in batch conditions employing a series of kinetic models. Initially, phenols uptake onto plasticized iron (III) treated PUF was fast followed by kinetically pseudo-second order rate equation with an overall rate constant (k) of 0.014 and 0.018 g (mg min)-1 for phenol and 2-chlorophenol (2-CP), respectively. Endothermic nature of phenols sorption is governed by the positive value of ∆H where as the negative values of ∆G dictate that the uptake of the analyte onto the sorbent is spontaneous phenomena. The positive values of ΔS for both phenols may be indicative of moderate sorption step of the complex anion [Fe(C 6 H 5 O) 6 ] 3and ordering of ionic charges with a compensatory disordering of the sorbed species onto the sorbents. PUF sorbent provides efficient removal of phenols traces from various water samples.

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Section: Retention Profile Of Phenols From Aqueous Solution Onto Ironmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Retention Profile and Selective Separation of Trace Concentrations of Phenols from Water onto Iron(III) Physically Loaded Polyurethane Foam Solid Sorbent: Kinetics and Thermodynamic Study

Ms¹,

Hamza²,

Alwael³

et al. 2014

J Chromatogr Sep Tech

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“…C abs and C ads are the equilibrium titanium (IV) ions onto the PUF as an absorbed and adsorbed species, respectively, S and K L are the saturation value for the Langmuir adsorption, the distribution coefficient and the Langmuir constant. This equation can be solved for D as reported earlier [20,21] as follows:…”

Section: Sorption Isotherms Of Titanium (Iv) By Pufmentioning

confidence: 99%

“…Polyurethane foam (PUF) sorbent in the last four decades UF has been tested as an excellent support in reversed phase extraction chromatography, gas-solid and gas-liquid partition chromatography [12][13][14][15][16][17][18][19][20][21][22][23]. The cellular structures and the available surface area of the PUF in both foamed and micro spherical forms make it suitable as an excellent extractor and as a column filing material with good capacity for firmly retaining various loading and extracting agents [21]. Preconcentration, separation and subsequent sensitive determination of titanium (IV) in various matrices at trace levels is of prime importance and necessitates.…”

Section: Introductionmentioning

confidence: 99%

“…Foam cubes (10-15 mm edge) of commercial white sheets of polyether type based PUF were cut from the foam sheets, purified and finally dried at 80˚C [20]. The immobilized reagent PUF cubes were prepared by mixing the dried foam cubes with an aqueous solution (50 mL g -1 dry foam) containing PAR or TZ + Cl -(0.1 % w/v) with efficient stirring for 30 min, squeezed and finally dried as reported [21]. The reagent PAR-immobilized PUF was packed in the glass columns (2 cm, 10 mm ID) by applying vacuum method of foam packing [13,18].…”

Section: Introductionmentioning

confidence: 99%

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ICP-OES Determination of Titanium (IV) in Marine and Wastewater Samples after Preconcentration onto Unloaded and Reagent Immobilized Polyurethane Foams Packed Columns

AS¹

2014

J Chromatogr Sep Tech

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A novel method that utilizes untreated and polyurethane foam (PUF) physically immobilized with the reagent 4-(2-pyridylazo) resorcinol (PAR) or 2, 3, 5-triphenyl-2H-tetrazolium chloride (TZ + Cl-) as solid phase extractor packed column has been developed for preconcentration and subsequent determination of titanium(IV) ions in marine and wastewater samples. The method is based on retention of the titanium(IV) traces present in aqueous media at pH 3-4 onto the reagent treated PUF packed column, followed by recovery with HNO 3 (2.0 mol dm-3) and subsequent ICP-OES determination. The uptake of titanium species onto the unloaded-and reagent impregnated PUF was fast and followed a first-order rate equation. Titanium sorption onto PUF followed Langmuir, Freundlich and Dubinin-Radushkevich (D-R) type isotherm models. Thus, a dual-mode sorption mechanism involving absorption related to "weak-base anion exchange" and an added component for "surface adsorption" seems a more likely retention model. PAR-immobilized PUF packed column has been applied successfully for complete collection of titanium(IV) species in fresh and wastewater samples at low level of titanium (<0.5 ng Ti mL-1) at pH 3-4. The retained titanium species were then recovered (97-101%) from the packed column with HNO 3 and determined by ICP-OES. The proposed PUF packed column method was further applied for analysis of picomolar concentrations of dissolved Ti species in marine water.

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Ligand‐grafted biomaterials for adsorptive separations of uranium in solution

Reeves

1999

AIChE Journal

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Unloaded polyether type polyurethane foams as solid extractants for trace elements

Cited by 16 publications

References 56 publications

Retention Profile and Selective Separation of Trace Concentrations of Phenols from Water onto Iron(III) Physically Loaded Polyurethane Foam Solid Sorbent: Kinetics and Thermodynamic Study

Retention Profile and Selective Separation of Trace Concentrations of Phenols from Water onto Iron(III) Physically Loaded Polyurethane Foam Solid Sorbent: Kinetics and Thermodynamic Study

ICP-OES Determination of Titanium (IV) in Marine and Wastewater Samples after Preconcentration onto Unloaded and Reagent Immobilized Polyurethane Foams Packed Columns

Ligand‐grafted biomaterials for adsorptive separations of uranium in solution

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