Adsorption and separation of platinum and palladium by polyamine functionalized polystyrene-based beads and nanofibers

Fayemi, Omolola E.; Ogunlaja, Adeniyi S.; Kempgens, Pierre; Antunes, Edith; Torto, Nelson; Nyokong, Tebello; Tshentu, Zenixole R.

doi:10.1016/j.mineng.2013.06.006

Cited by 59 publications

(25 citation statements)

References 38 publications

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“…The low nitrogen content was also observed by Fayemi et al 34 upon functionalizing PVBC with triethylenetetramine (TETA) and tris-(2-aminoethyl) amine (TAEA). The low nitrogen and vanadium loading could be attributed to functionalization reaction being carried out at room temperature to avoid harsh condition on the fibres.…”

Section: Synthesismentioning

confidence: 54%

“…34 A solution of 4-vinylbenzylchloride (4-VBC) (10 mL) in 2 mL of toluene was polymerized at 70 °C for 12 h in the presence of 2,2-azobis(isobutyronitrile) (0.05 g) under an argon atmosphere. The resulting brown solid was dissolved in 20 mL of THF, and the resultant solution was transferred into a beaker containing methanol, giving rise to a white polymer precipitate of PVBC.…”

Section: Synthesis Of Poly(vinylbenzylchloride) (Pvbc)mentioning

confidence: 99%

“…The surface area of PVBC nanofibres was found to be 342 m 2 g -1 . 34 Upon functionalization with 2,2'-(1E,1'E)-(1,2-phenylenebis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)bis(4-aminophenol) and VOSO 4 the polymer fibres surface area dropped to 122 m 2 g -1 . The reduction in surface area was due to the functionalization of PVBC on the surface.…”

Section: Surface Area Of Pvbc and Vo-fibrementioning

confidence: 99%

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The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

OGUNLAJA,

HOSTEN,

TSHENTU

2015

S.Afr.j.chem

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Polyvinylbenzylchloride nanofibres were fabricated by the electrospinning technique and subsequently functionalized with a tetradentate ligand, 2,2'-(1E,1'E)-(1,2-phenylenebis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)bis(4-aminophenol). VO 2+ was then incorporated into the nanofibres to produce the catalyst VO-fibres. Microanalysis, TG and FT-IR were used for the characterization of VO-fibre, and EPR also confirmed the presence of oxidovanadium(IV) within the nanofibres. Oxidation of dibenzothiophene (DBT) was investigated by varying the catalyst amount, substrate amount, oxidant and temperature, and the progress of oxidation was followed with a gas chromatograph fitted with a flame ionization detector. An increase in the amount of oxidant caused an increase in the amount of dibenzothiophene sulfone (DBTO 2 ), while a decrease in the quantity of dibenzothiophene resulted in an increase in the overall yield of dibenzothiophene sulfone under a constant temperature and oxidant (H 2 O 2 ) concentration. Dibenzothiophene sulfone was confirmed as the oxidation product through 1 H-NMR spectroscopy and single crystal X-ray diffraction. KEYWORDSVanadium(IV) catalyst, nanofibres, dibenzothiophene, oxidation, hydrogen peroxide (H 2 O 2 ).

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Section: Synthesismentioning

confidence: 54%

Section: Synthesis Of Poly(vinylbenzylchloride) (Pvbc)mentioning

confidence: 99%

Section: Surface Area Of Pvbc and Vo-fibrementioning

confidence: 99%

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The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

OGUNLAJA,

HOSTEN,

TSHENTU

2015

S.Afr.j.chem

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“…As shown in Fig. 3, the absorption band at 1658 cm −1 assigned to C=O bonds, C=S stretching bands at 1255 cm −1 , and C-N stretching bands at 1086-1360 cm −1 were shifted to 1661-, 1247-, and 1091-1375-cm −1 regions, respectively (Fayemi et al 2013;Lin and Lien 2013). In Scheme 2, the proposed structure of the PVA/MA/ATM NFm is given.…”

Section: Characterization Of the Nanofiber Membranesmentioning

confidence: 94%

“…Among these methods, adsorption is the most suitable method for the recovery of precious metals due to its low cost, ease in handling, high efficiency, reversibility, and the availability of different adsorbents. A number of adsorbents have been developed for the recovery of precious metals, such as activated carbon (Navarro et al 2006;Aktas and Morcali 2011a), chelating resins (Atia et al 2005;Birinci et al 2009), and membranes (Fayemi et al 2013). The adsorption efficiency, selectivity, equilibrium time, regeneration, and stability of these materials depend on the functional groups of the adsorbent surface, which are effective in forming complexation with metal ions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Adsorption Application of In Situ Photo-Cross-Linked Electrospun Poly(Vinyl Alcohol)-Based Nanofiber Membranes

Zeytuncu

Akman

Yücel

et al. 2015

Water Air Soil Pollut

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Poly(vinyl alcohol)/maleic anhydride/acryloyl thioamide monomer (PVA/MA/ATM) nanofiber membranes (NFm) were synthesized by a combination of UV radiation and an electrospinning technique. The PVA/MA/ATM NFm were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), Brunauer-Emmert-Teller (BET) analysis, scanning electron microscopy (SEM), and energy dispersion spectrometry (EDS). These membranes were used for adsorption-desorption of platinum (Pt(IV)) and palladium (Pd(II)) from a fire assay (FA) leaching waste solution, and the effect of process parameters such as pH of solution, contact time, NFm dosage, temperature, and adsorption isotherms and kinetics studies on the recovery of Pt(IV) and Pd(II) from the waste solution were investigated. The adsorption equilibrium data fit better using the Langmuir model than the Freundlich model. Maximum adsorption capacities, Q max , at 45°C were found to be 69.93 and 112.36 mg/g for Pt(IV) and Pd(II), respectively. The activation energies (E a ) of Pt(IV) and Pd(II) were 27.90 and 20.29 kJ/mol, respectively. The best desorption reagent was a 1.0 M HCl-1.0 M thiourea (TU) solution for both Pd(II) and Pt(IV). Reusability studies showed that the adsorption capacity can remain up to 90 % after five times of usage. This study provides a promising NFm with an effective adsorption property for Pt(IV) and Pd(II) ions.

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Equilibrium, kinetics, and thermodynamics of Pd(II) adsorption onto poly(m‐aminobenzoic acid) chelating polymer

Mildan

Gülfen

2015

J of Applied Polymer Sci

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This study describes the equilibrium, kinetics, and thermodynamics of the palladium(II) (Pd(II)) adsorption onto poly(m-aminobenzoic acid) (p-mABA) chelating polymer. The p-mABA was synthesized by the oxidation reaction of maminobenzoic acid monomer with ammonium peroxydisulfate (APS). The synthesized p-mABA chelating polymer was characterized by FTIR spectroscopy, gel permeation chromatography (GPC), thermal analysis, potentiometric titration, and scanning electron microscopy (SEM) analysis methods. The effects of the acidity, temperature, and initial Pd(II) concentration on the adsorption were examined by using batch adsorption technique. The optimum acidity for the Pd(II) adsorption was determined as pH 2. In the equilibrium studies, it was found that the Pd(II) adsorption capacity of the polymer was to be 24.21 mg/g and the adsorption data fitted better to the Langmuir isotherm than the Freundlich isotherm. The kinetics of the adsorption fitted to pseudo-second-order kinetic model. In the thermodynamic evaluation of the adsorption, the DG8 values were calculated as 216.98 and 222.26 kJ/mol at 25-558C temperatures. The enthalpy (DH8), entropy (DS8), and the activation energy (E a ) were found as 35.40 kJ/mol, 176.05 J/mol K, and 61.71 kJ/mol, respectively. The adsorption of Pd(II) ions onto p-mABA was a spontaneous, endothermic, and chemical adsorption process which is governed by both ionic interaction and chelating mechanisms.Poly(m-aminobenzoic acid) is a poly(aniline) derivative polymer, which is also named poly(aniline-3-carboxylic acid).

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Adsorption and separation of platinum and palladium by polyamine functionalized polystyrene-based beads and nanofibers

Cited by 59 publications

References 38 publications

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

Synthesis and Adsorption Application of In Situ Photo-Cross-Linked Electrospun Poly(Vinyl Alcohol)-Based Nanofiber Membranes

Equilibrium, kinetics, and thermodynamics of Pd(II) adsorption onto poly(m‐aminobenzoic acid) chelating polymer

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