Adsorption characteristics of noble metals on the strongly basic anion exchanger Purolite A-400TL

Wołowicz, Anna; Hubicki, Zbigniew

doi:10.1007/s10853-014-8333-x

Cited by 18 publications

(2 citation statements)

References 14 publications

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“…Therefore, recovering precious metals (including Pd) from waste resources is becoming an important industrial challenge. Many studies have been focusing on the recovery of Pd(II) from acidic leachates of waste catalysts [7]. On the other hand, there is still much scope left for improving its application potential as catalysts.…”

Section: Introductionmentioning

confidence: 99%

Palladium nanoparticles supported on amine-functionalized alginate foams for hydrogenation of 3-nitrophenol

Mo¹,

Vincent²,

Roux³

et al. 2019

J Mater Sci

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A new material, consisting of alginate-polyethyleneimine (AP) foam, with high percolating properties has been designed for palladium recovery in fixed-bed reactor. The foam, having high affinity for Pd(II), can be also used for manu-facturing heterogeneous hydrogenation catalyst. SEM-EDX and TEM analyses were performed to determine the structure of the foams and the distribution of Pd nanoparticles (after metal reduction). Metal-sorbent interactions and oxida-tion state of Pd are characterized by XPS. Pd(0)-bearing foams are investigated for the hydrogenation of 3-nitrophenol (3-NP) using HCOOH as the hydrogen donor. The maximum sorption capacity of Pd(II) by AP foams reaches up to 224 mg g -1 . The water flux (under water-depth pressure of 6 mbar) reaches 24.8 mL cm -2 min -1 (superficial flow velocity: 14.9 m h -1 ). The foams are remarkably stable: The mass loss under strong shaking for 2 days does not exceed 3%. For catalytic application, Pd loading conditions were optimized (flow rate, metal concentration) to reach 101 mg Pd g -1 (97% metal removal). Under these conditions, Pd overloading and nanoparticles aggregation can be minimized. The catalytic hydrogenation of 3-nitrophenol (using formic acid as the hydrogen donor) was optimum for a HCOOH/3-NP molar ratio close to 160 (pH between 3 and 4). High flow rates minimize diffusion effects; the apparent rate constant (for pseudo-first-order rate equation) reaches 9.7 9 10 -3 s -1 . The reuse of the foams over 30 cycles shows the long-term stability of catalytic activity. The test on continuous (one-pass) mode shows a progressive poisoning of the catalyst. However, a simple washing with water is sufficient for recov-ering catalytic activity.

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Section: Introductionmentioning

confidence: 99%

Palladium nanoparticles supported on amine-functionalized alginate foams for hydrogenation of 3-nitrophenol

Mo¹,

Vincent²,

Roux³

et al. 2019

J Mater Sci

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“…Gold recovery from industrial waste is performed by pyrometallurgy, hydrometallurgy, bio-hydrometallurgy techniques [7,[10][11][12][13][14][15][16][17][18][19][20][21][22][23]. However, it has been recognized since long time that growing demand for safety concern requires clean and efficient procedures [16].…”

Section: Introductionmentioning

confidence: 99%

Gold(III) extraction and recovery and gold(III)/copper(II) separation using micelles

Aydınoğlu

Biver

Ceccarini

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Gold extraction from aqueous solutions has been performed by micellar enhanced ultrafiltration (MEUF), using SDS and DTAC micelles. DTAC entraps 92-100% of the metal, which is present in form of AuCl4^-, owing to electrostatic interaction. Using SDS the extraction of gold is unsuccessful. However, addition of PADA, as a metal extractor agent, according to the ligand modified micellar enhanced ultrafiltration (LM-MEUF) procedure, makes the extraction yield to approach 100% also with SDS. The recovery of gold entrapped in the micellar pseudo-phase has also been investigated. Different stripping agents have been used, the most efficient of them being a mixture of NaCl and NH3 which allowed the metal to be expelled from the micelle with a yield of 85%. Finally, Au(III)/Cu(II) separation is achieved with DTAC or SDS between pH 3 and 5. Almost 100% of Au(III) is retained on DTAC micelles while all Cu(II) remains in the aqueous medium, while the opposite occurs in SDS

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Enhanced removal of copper(II) from acidic streams using functional resins: batch and column studies

Wołowicz

Hubicki

2020

J Mater Sci

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The adsorption behaviour of copper(II) ions in acidic streams using different polymeric adsorbents (Lewatit MonoPlus TP 220, Lewatit MonoPlus SR 7, Lewatit AF 5, Purolite A 830, Purolite S 984, Purolite A 400 TL, Dowex PSR 2, Dowex PSR 3) was studied, and the results were compared. The adsorbents were characterized by determination of the point of zero charge and the Fourier transform infrared spectroscopy method. The kinetic (effects of phases contact time) and equilibrium (effect of initial Cu(II) concentration) studies were also carried out. The effects of hydrochloric and nitric(V) acids on adsorption behaviour of Cu(II) were examined. The FTIR spectra after the Cu(II) adsorption were also obtained, and the mechanism of Cu(II) sorption was proposed. Of eight adsorbents, the best one was chosen and applied in further studies (column adsorption, column and batch desorption, reuse of adsorbent in cycles of sorption–desorption, selectivity in two-component solutions Pd(II)–Cu(II)). Cu(II) sorption efficiency was the highest using Lewatit MonoPlus TP 220. Its sorption is well described by the pseudo-second-order kinetic equation and the Langmuir isotherm model. Ion exchangers show also high affinity for noble metals, especially for gold(III): Au(III) > Pd(II) > Pt(IV) (the column test) from single- and two- or three-component solutions (the batch test). Graphic abstract

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Adsorption characteristics of noble metals on the strongly basic anion exchanger Purolite A-400TL

Cited by 18 publications

References 14 publications

Palladium nanoparticles supported on amine-functionalized alginate foams for hydrogenation of 3-nitrophenol

Palladium nanoparticles supported on amine-functionalized alginate foams for hydrogenation of 3-nitrophenol

Gold(III) extraction and recovery and gold(III)/copper(II) separation using micelles

Enhanced removal of copper(II) from acidic streams using functional resins: batch and column studies

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