Polyurethane Foam Sorbents in Separation Science

Braun, Tibor; Navratil, J.D.; Farag, A.B.

doi:10.1201/9781351075916

Cited by 61 publications

(20 citation statements)

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“…Polyurethane foams (PUFs) and foams immobilized with supporting solvent extractants, chelating agents, liquid ion exchangers, anchored extracting groups and powdered ion exchangers sorbents have been reported for pre-concentration and separation of various inorganic and organic species from different media [16][17][18][19][20][21][22]. The most distinctive features of PUFs as solid sorbents are their membrane-like structure which differentiates them from others [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…The foam membranes act as sorbents, i.e. the ions and/or molecules to be separated or pre-concentrated are retained on/in the membrane-like structure of the foams as shown in Figure 1 [17][18][19]. The volume-to-surface ratio of quasi-spherical membrane geometry in comparison with cylindrical or planar one are the most advantageous characteristics of PUFs.…”

Section: Introductionmentioning

confidence: 99%

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Chromatographic Separation, Total Determination and Chemical Speciation of Mercury in Environmental Water Samples Using 4-(2-Thiazolylazo) Resorcinol-Based Polyurethane Foam Sorbent-Packed Column

Al-Bagawi¹,

Ahmad²,

Alwael³

et al. 2019

Chemometrics and Data Analysis in Chromatography

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A simple method has been developed for quantitative retention of traces of mercury(II) ions from aqueous media using polyurethane foams (PUFs) loaded with 4-(2-thiazolylazo) resorcinol (TAR). The kinetics and thermodynamics of the sorption of mercury(II) ions onto PUFs were studied. The sorption of mercury(II) ions onto PUF follows a first-order rate equation with k = 0.176 ± 0.010 min −1. The negative values of ΔH and ΔS may be interpreted as the exothermic chemisorption process and indicative of a faster chemisorption onto the active sites of the sorbent. The sorption data followed Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The D-R parameters β, K DR and E were 0.329 mol 2 kJ −2 , 0.001 μmol g −1 and 1.23 ± 0.07 kJ/mol for the TAR-loaded PUFs, respectively. An acceptable retention and recovery (99.6 ± 1.1%) of mercury(II) ions in water at ≤10 ppb by the TAR-treated PUFs packed columns were achieved. A retention mechanism, involving absorption related to "solvent extraction" and an "added component" for surface adsorption, was suggested for the retention of mercury(II) ions by the used solid phase extractor. The performance of TAR-immobilized PUFs packed column in terms of the number (N), the height equivalent to a theoretical plate (HETP), the breakthrough and critical capacities of mercury(II) ion uptake by the sorbent packed column were found to be 50.0 ± 1.0, 1.01 ± 0.02 mm, 8.75 and 13.75 mg/g, respectively, at 5 mL/min flow rate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chromatographic Separation, Total Determination and Chemical Speciation of Mercury in Environmental Water Samples Using 4-(2-Thiazolylazo) Resorcinol-Based Polyurethane Foam Sorbent-Packed Column

Al-Bagawi¹,

Ahmad²,

Alwael³

et al. 2019

Chemometrics and Data Analysis in Chromatography

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“…Preliminary investigation has shown that by shaking PUFs with solution of Hg (HDz) 2 in acetone, considerable amount of mercury dithizonate is retained onto PUFs in short time. The complex Hg(HDz) 2 can be recovered quantitatively using dimethylformamide (DMF) [28]. The fact that on shaking [Hg(HDz) 2 -PUF] pieces with an alkaline cyanide solution in alkaline media, a strong discoloration of Hg (HDz) 2 complex retained on the SPE.…”

Section: Resultsmentioning

confidence: 99%

Headspace sorptive solid phase microextraction (HS-SPME) combined with a spectrophotometry system: A simple glass devise for extraction and simultaneous determination of cyanide and thiocyanate in environmental and biological samples

Al-Saidi

Al‐Harbi

Aljuhani

et al. 2016

Talanta

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“…Braun and co-workers have extensively investigated polyurethane (PU) foam sorbents regarding the preconcentration and separation of trace metals [51]. The selective sorption and separation of Fe, Co, Hg, Zn, and In, Rh, and Ir, and Pd by unloaded PU foam were successful in acidic aqueous thiocyanate media.…”

Section: Polyurethane Foamsmentioning

confidence: 99%

Separation and preconcentration of trace elements

Terada

1994

Determination of Trace Elements

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Polyurethane Foam Sorbents in Separation Science

Cited by 61 publications

References 0 publications

Chromatographic Separation, Total Determination and Chemical Speciation of Mercury in Environmental Water Samples Using 4-(2-Thiazolylazo) Resorcinol-Based Polyurethane Foam Sorbent-Packed Column

Chromatographic Separation, Total Determination and Chemical Speciation of Mercury in Environmental Water Samples Using 4-(2-Thiazolylazo) Resorcinol-Based Polyurethane Foam Sorbent-Packed Column

Headspace sorptive solid phase microextraction (HS-SPME) combined with a spectrophotometry system: A simple glass devise for extraction and simultaneous determination of cyanide and thiocyanate in environmental and biological samples

Separation and preconcentration of trace elements

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