Highly selective recovery of palladium by a new silica-based adsorbent functionalized with macrocyclic ligand

Bai, Feifei; Ye, Gang; Chen, Guangjin; Wei, Jichao; Wang, Jianchen; Chen, Jing

doi:10.1016/j.seppur.2012.12.021

Cited by 72 publications

(18 citation statements)

References 47 publications

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“…From the adsorption isotherms (Figure A), POP‐Py, POP‐ p NH 2 ‐Py, and POP‐ o NH 2 ‐Py were fit with the Langmuir model with uptake capacities of 708, 743, and 752 mg g −1 , respectively. All of the materials produced record high palladium uptakes, with the addition of the amino group further improving the uptake performance. Typically, a higher surface area results in enhanced adsorption performance through the availability of more exposed binding sites, however, in this work we see the opposite trend for the pyridine‐based POPs.…”

Section: Figurementioning

confidence: 99%

A Porous Organic Polymer Nanotrap for Efficient Extraction of Palladium

Aguila

Sun²,

Cassady

et al. 2020

Angewandte Chemie

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To offset the environmental impact of platinumgroup element (PGE) mining, recycling techniques are being explored. Porous organic polymers (POPs) have shown significant promise owing to their selectivity and ability to withstand harsh conditions. A series of pyridine-based POP nanotraps, POPPy , POP-pNH 2-Py, and POP-oNH 2-Py, have been designed and systematically explored for the capture of palladium, one of the most utilized PGEs. All of the POP nanotraps demonstrated record uptakes and rapid capture, with the amino group shown to be vital in improving performance. Further testing on the POP nanotrap regeneration and selectivity found that POP-oNH 2-Py outperformed POP-pNH 2-Py. Single-crystal X-ray analysis indicated that POP-oNH 2-Py provided a stronger complex compared to POP-pNH 2-Py owing to the intramolecular hydrogen bonding between the amino group and coordinated chlorine molecules. These results demonstrate how slight modifications to adsorbents can maximize their performance. Platinum-group elements (PGEs) are recognized for their unique properties such as corrosion resistance, high melting point, and catalytic qualities. These features have made them economically invaluable, with widespread use in a variety of industrial sectors. Elements in this category, namely platinum, palladium, rhodium, ruthenium, iridium, and osmium, are

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Section: Figurementioning

confidence: 99%

A Porous Organic Polymer Nanotrap for Efficient Extraction of Palladium

Aguila

Sun²,

Cassady

et al. 2020

Angewandte Chemie

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“…The calculated values of q e.cal (312.5-338.8 mg/g) by pseudo-second-order model were in close agreement with the q e.exp (310-330 mg/g) while the theoretical adsorption capacity for the pseudo-first-order model was very lower than the experimental data. The results indicated that the pseudo-second-order adsorption kinetic model was more appropriate for Pd(II) adsorption process than the pseudofirst-order one, which suggesting that two adsorption site on PTCS surface could be occupied by one divalent ion probably due to the formation of (Pd 2+ and/or (PdOH + ) 2 ) in aqueous solution [47], and the rate-controlled step involved in the adsorption process might be the external mass transfer resistance and the chelating reaction occurred on the outer surface of PTCS [48].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Biosorption of palladium(II) from aqueous solution by grafting chitosan on persimmon tannin extract

Zhou

Liu

Huang

et al. 2015

International Journal of Biological Macromolecules

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“…[ 3 , 4 ]. In this context, due to the limited resources, it is very important to find a way to recover Pd from wastewaters produced by different industries which use PGMs extensively [ 2 , 4 , 5 , 6 ]. Pd recovery and recycling becomes feasible by developing new techniques for Pd effective pre-concentration and separation from such wastewaters [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Performance of Functionalized Amberlite XAD7 with Dibenzo-18-Crown Ether-6 for Palladium Recovery

et al. 2021

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Due to the increased demand for palladium, as well due to its reduced availability in nature, its recovery from diluted waste solutions becomes a necessity, and perhaps an emergency. As a result of economic and technological development, new materials with improved adsorbent properties that are more efficient for metallic ions’ recovery were synthesized and introduced to market. The goal of this study was to obtain a new adsorbent material by functionalizing through impregnation a commercial polymeric support that was both inexpensive and environmentally friendly (Amberlite XAD7) with crown ether (di-benzo-18-crown-6—DB18C6). Crown ethers are known for their ability to form complexes within metallic ions, by including them inside of the ring, regardless of its atomic size. Adsorbent material was prepared by impregnation using the solvent-impregnated resin method (SIR). To highlight the presence of crown ether on the resin surface, a new synthesized material was characterized by scanning electron microscopy (SEM), elemental analysis X-ray energy dispersive spectroscopy (EDX) and Fourier transform infrared spectroscopy (FT-IR). The specific surface of the adsorbent material was also determined by the Brunauer–Emmett–Teller (BET) method. Adsorbent performances of the prepared material were highlighted by kinetic, thermodynamic and equilibrium studies and a possible mechanism was also proposed. The influence of specific parameters for the adsorption process (contact time, temperature, Pd(II) initial concentration) on the maximum adsorption capacity was pursued.

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Highly selective recovery of palladium by a new silica-based adsorbent functionalized with macrocyclic ligand

Cited by 72 publications

References 47 publications

A Porous Organic Polymer Nanotrap for Efficient Extraction of Palladium

A Porous Organic Polymer Nanotrap for Efficient Extraction of Palladium

Biosorption of palladium(II) from aqueous solution by grafting chitosan on persimmon tannin extract

Evaluation of Performance of Functionalized Amberlite XAD7 with Dibenzo-18-Crown Ether-6 for Palladium Recovery

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