Studies on the Sorption of Palladium using Cross‐Linked Poly (4‐Vinylpyridine‐Divinylbenzene) Resins in Nitric Acid Medium

Kumaresan, R.; Sabharwal, K. N.; Srinivasan, T. G.; Rao, P. R. Vasudeva; Dhekane, Gunesh

doi:10.1080/07366290802301465

Cited by 16 publications

(9 citation statements)

References 47 publications

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“…For the case of PVP 25 , it appears a vibration at 711 cm 21 absorption band, which can be assigned to out-of-plane bending and describes the orientation of the aromatic rings with five adjacent hydrogen atoms, promoted by its 25% of crosslinking. These characteristics have been observed for metal loading purposes [24,25]. In Figure 4, it is presented the FTIR spectra of PVP 2 and the catalyst (PVP 2 -Cu(II)).…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 96%

Heterogenization of copper catalyst for the oxidation of phenol, a common contaminant in industrial wastewater

Castro

Fortuny

Font

et al. 2012

Env Prog and Sustain Energy

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Advance oxidation process was employed as a pretreatment of industrial wastewater. For this purpose, the use of heavy metals as a catalyst is necessary but also complicated because homogeneous catalysts are difficult to recover after reaction process. The heterogenization of Cu(II) ions was proposed by taking advantage of the adsorptive characteristics of polymeric matrices. Crosslinked poly(4-vinylpyridine) of 2 and 25% and poly(D-glucosamine) were tested as supports of copper. Adsorption was employed to heterogenize Cu(II) by considering the influences of pH and temperature on the process. The catalysts were evaluated by their metal content, catalytic behavior for the oxidation of phenol and leaching degree after reaction. Poly(4-vinylpyridine) 2% was the best material for Cu(II) immobilization with an adsorption capacity of 90 mg g 21 . Afterward, poly(4-vinylpyridine) 2%, Cu(II) achieved 64% of phenol conversion, which represents a favorable result for the oxidation of phenol as the model of industrial wastewater pretreatments.

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Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 96%

Heterogenization of copper catalyst for the oxidation of phenol, a common contaminant in industrial wastewater

Castro

Fortuny

Font

et al. 2012

Env Prog and Sustain Energy

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“…With the increase in nitric acid con-centration, the amount of different nitrate cationic and anionic complexes as well as of neutral species is growing [19,20]:…”

Section: Ionic State Of Palladium In Contacting Solutionsmentioning

confidence: 99%

“…These peaks are assigned to vibrations of N-O bonds of nitrate ion: peak at 1384 cm -1 corresponds with stretching vibrations of free 3 NO  [20,39], whereas peaks at 1352 and 1300 cm -1 can be assigned to the N-O stretching vibrations in palladium complex [39]. It should be noted that the greatest intensity of these peaks is revealed in IR-spectrum of strong basic anion exchanger AV-17-8 (Figure 2, spectrum 5).…”

Section: Ft-ir Study Of Palladium Sorptionmentioning

confidence: 99%

“…It can be seen from these data that in general all the resins reveal high sorption ability, since they recover on the level ~70 Pd It is interesting to note, that all ion exchangers except Purolite S 985 possess approximately equal affinity to , despite of their different physical and chemical structure. The nature of functional groups of the ion exchangers investigated allows to form the following types of chemical bonds during their contact with noble metal ions [5,6,19,20]:…”

Section: Sorption Recovery Of Palladium From Model Nitrate Solutionsmentioning

confidence: 99%

“…One of the most promising methods for recovery of platinum group metals (in particular, of palladium) is sorption, characterized by high efficiency and selectivity [1,[3][4][5]. However, the majority of investigations devoted to the sorption recovery of palladium, deal with chloride or sulfate solutions [6][7][8][9][10][11][12][13][14], and the studies of sorption of noble metals from nitric acidic media are rather limited [1,[15][16][17][18][19][20]. At the same time, the recovery of palladium from some kinds of secondary sources (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Ion exchange recovery of palladium (II) from nitrate weak acidic solutions

Кононова¹,

Goryaeva²,

Dychko³

2009

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Sorption recovery of palladium (II) from nitrate weak acidic model solutions and solutions of spent catalysts on some ion exchangers with different physical and chemical structure has been investigated. The palladium concentration in contacting solutions was 5.0 ? 10-5 – 1.0 ? 10-3 mol/L at nitric acid and potassium nitrate con-centrations 0.01 and 1.0 mol/L, respectively. It was shown that anion exchangers AV-17-8 as well as Purolite S 985 and A 500 possess the best sorption and kinetic properties. These sorbents can be recommended for selective recovery of palladium from solutions of spent catalysts

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Ultra‐Selective and Efficient Static/Dynamic Palladium Capture from Highly Acidic Solution with Robust Macrocycle‐Based Polymers

Wang

et al. 2023

Adv Funct Materials

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The capture of palladium from spent nuclear fuel is crucial for the sustainable development of nuclear energy and resource recovery. One of the most challenging issues in this direction is the survival of adsorbents under extreme reprocessing conditions such as strongly acidic media and high radiation fields while still maintaining high extraction ability and selectivity. Herein, an approach to addressing this issue is reported by incorporating macrocycle into nitrogen‐rich covalent organic polymers (COPs). Dramatically outperforming current adsorbing materials, pillar[5]arene‐based COPs with pyridyl and triazolyl functionalities display record adsorption capacity for Pd(II) at 3 M HNO3 (403 mg g−1), extraordinary stability under 500 kGy gamma irradiation, and ultra‐high selectivity toward Pd(II) over both 17 coexisting cations and six anions. In particular, the material P5COP‐m‐BPT with the best performance also shows remarkable dynamic adsorption efficiency for Pd(II). This study not only provides a strategy to enhance all‐sided adsorption performance in palladium separation with nitrogen‐rich COPs materials but also demonstrates the superiority of customizing advanced materials with macrocycles.

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Studies on the Sorption of Palladium using Cross‐Linked Poly (4‐Vinylpyridine‐Divinylbenzene) Resins in Nitric Acid Medium

Cited by 16 publications

References 47 publications

Heterogenization of copper catalyst for the oxidation of phenol, a common contaminant in industrial wastewater

Heterogenization of copper catalyst for the oxidation of phenol, a common contaminant in industrial wastewater

Ion exchange recovery of palladium (II) from nitrate weak acidic solutions

Ultra‐Selective and Efficient Static/Dynamic Palladium Capture from Highly Acidic Solution with Robust Macrocycle‐Based Polymers

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