Flame atomic absorption determination of palladium after separation and preconcentration using polyethyleneimine water-soluble polymer/alumina as a new sorbent

Sabermahani, Fatemeh; Taher, Mohammad Ali

doi:10.1039/b927405g

Cited by 16 publications

(10 citation statements)

References 25 publications

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“…Crown ether grafted onto MgSiO 3 offers high efficiency in the recovery of Pd(II) from aqueous solutions, forming the sandwich complexes known in the literature [ 27 , 44 , 45 ]. The selectivity of crown ethers depends on the compatibility between the size Pd(II) ions and the size of the crown cavity (number of O atoms of the crown) [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

Ciopec

Grad

Negrea

et al. 2021

IJMS

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The study of new useful, efficient and selective structures for the palladium ions’ recovery has led to the development of a new series of macromolecules. Thus, this study presents a comparative behavior of two crown benzene ethers that modify the magnesium silicate surface used as adsorbent for palladium. These crown ethers are dibenzo18-crown-6 (DB18C6) and dibenzo 30-crown-10 (DB30C10). The obtained materials were characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX) and Fourier-transform infrared spectroscopy (FT-IR). The specific surface area (BET) and point of zero charge (PZC) of the two materials were determined. The palladium ions’ recovery from synthetic aqueous solutions studies aimed to establish the adsorption mechanism. For this desideratum, the kinetic, equilibrium and thermodynamic studies show that MgSiO3-DB30C10 have a higher adsorption capacity (35.68 mg g−1) compared to MgSiO3-DB18C6 (21.65 mg g−1). Thermodynamic studies highlight that the adsorption of Pd(II) on the two studied materials are spontaneous and endothermic processes. The positive values of the entropy (ΔS0) suggest that the studied adsorption processes show a higher disorder at the liquid/solid interface. Desorption studies were also performed, and it was found that the degree of desorption was 98.3%.

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Section: Resultsmentioning

confidence: 99%

A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

Ciopec

Grad

Negrea

et al. 2021

IJMS

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“…Thus, PEI could be immobilized partially through amide bond as well as electrostatic interaction over CA-AO. 22…”

Section: Resultsmentioning

confidence: 99%

“…21 PEI coated onto alumina was used as a sorbent with an adsorption capacity of 13 mg g –1 . 22 PEI-coated polysulfone/ Escherichia coli has been studied recently as a biosorbent for the sorption of Pd(II). Here, polysulfone was used as a polymer matrix for immobilization of E. coli biomass and to enhance the adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Effective Adsorption of Precious Metal Palladium over Polyethyleneimine-Functionalized Alumina Nanopowder and Its Reusability as a Catalyst for Energy and Environmental Applications

et al. 2017

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Palladium is one of the widely used precious metals toward catalysis, energy, and environmental applications. Efficient recovery and reusability of palladium from the spent catalysts is not only highly desirable for sustainable industrial processing but also for preventing environmental contamination. Here, we present a facile citrate-mediated amine functionalization of alumina nanopowder (AO) in aqueous medium. The surface functionalization is probed using infrared (IR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis, surface area, and zeta potential measurements. The amine-functionalized sorbent is thoroughly studied for its vital palladium-sorption parameters such as amount of adsorbent, pH, adsorption capacity, thermodynamics, and kinetics. The palladium adsorption over amine-functionalized AO is further characterized with X-ray diffraction and XPS. IR analysis of palladium adsorbed over polyethyleneimine is performed to elucidate the mechanistic insight on the role of nitrogen in capturing palladium. The amine-functionalized sorbent after adsorbing palladium is studied for the catalytic reduction of 4-nitrophenol and Cr(VI) and hydrogen generation from ammonia borane, which demonstrated its excellent catalytic activity and reusability toward energy and environmental applications. The environmentally benign materials and all-aqueous reactions employed in this work demonstrate the potential of the strategy for efficient and economical industrial transformations and waste-stream management.

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“…The sorption capacity was found to be 13 mg g À1 at an optimized pH of 6.0 and thiourea-HCl solution was used to effectively elute adsorbed palladium from the adsorbent surface. 121 Alumina loaded with 5-bromo-2-pyridylazo-5-(diethylamino) phenol (5-Br-PADAP) was used for the removal of Ni(II) and Pd(II) from surface water. The obtained sorption capacities for 1.0 g sorbent at pH 6.0 were 6.0 mg Ni(II) and 11.0 mg Pd(II) respectively.…”

Section: Solid Phase Extractionmentioning

confidence: 99%

A perspective on diverse adsorbent materials to recover precious palladium and the way forward

2017

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The removal and recovery of precious noble metals is noteworthy in a variety of applications. The need to recover these precious metals is associated with their high cost and other environmental impacts. The Nobel Prize conferred to Suzuki, Heck and Negishi in 2010 has underlined the remarkable significance of palladium as a catalyst in several important transformations. Palladium is one such platinum group noble metal that finds diverse applications in the automobile industry, electronics, jewelry, pharmaceutics, catalysis, etc. Therefore, the recovery of palladium has acquired importance. Methods such as liquidliquid extraction and adsorption using biopolymers, polymeric resins, carbonaceous materials and silica based materials are discussed based on their removal efficiency, adsorption capacities, regeneration and other parameters. The review looks at a perspective based on the applicability of certain important adsorbents employed in recent years pertaining to the removal of palladium from aqueous solution, spent catalysts and industrial wastes.

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Flame atomic absorption determination of palladium after separation and preconcentration using polyethyleneimine water-soluble polymer/alumina as a new sorbent

Cited by 16 publications

References 25 publications

A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

Effective Adsorption of Precious Metal Palladium over Polyethyleneimine-Functionalized Alumina Nanopowder and Its Reusability as a Catalyst for Energy and Environmental Applications

A perspective on diverse adsorbent materials to recover precious palladium and the way forward

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