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

Sharma, Shivani; Kumar, A. Santhana Krishna; Rajesh, N.

doi:10.1039/c7ra10153h

Cited by 72 publications

(39 citation statements)

References 117 publications

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“…However, from the viewpoint of economics and environment control, the introduction of effective approaches/adsorbents for extracting and recovery of this valuable metal is still necessary. 3,16 Metal-organic frameworks (MOFs) as new generation of porous materials, are 3D crystalline and low-dense structures constructed from inorganic nodes and organic ligands. [17][18][19] MOFs can be rationally pre-designed and synthesized to have very high surface area, high porosity (pore size values ranging from a few angstroms to several nanometers), high stability, and unique properties.…”

Section: Introductionmentioning

confidence: 99%

A Pyridyltriazol Functionalized Zirconium Metal–Organic Framework for Selective and Highly Efficient Adsorption of Palladium

Daliran

Ghazagh-Miri

Oveisi

et al. 2020

ACS Appl. Mater. Interfaces

128

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This work reports the synthesis of pyridyltriazol-functionalized UiO-66 (UiO stands for University of Oslo), namely UiO-66-Pyta, from UiO-66-NH 2 through three post-synthetic modification (PSM) steps. The good performance of the material derives from the observation that partial formylation (~21% of -NHCHO groups) of H 2 BDC-NH 2 by DMF, as persistent impurity, takes place during synthesis of the UiO-66-NH 2 . Thus, to enhance material performance, firstly, the as-synthesized UiO-66-NH 2 was deformylated to give pure UiO-66-NH 2 . Subsequently, the pure UiO-66-NH 2 was converted to UiO-66-N 3 with nearly complete conversion (~95 %). Finally, the azide-alkyne[3+2]-cycloaddition reaction of 2-ethynylpyridine with the UiO-66-N 3 gave the UiO-66-Pyta. The porous MOF was then applied for the solidphase extraction of palladium ions from aqueous medium. Affecting parameters on extraction efficiency of Pd(II) ions were also investigated and optimized. Interestingly, UiO-66-Pyta exhibited selective and superior adsorption capacity for Pd(II) with maximum sorption capacity of 294.1 mg g -1 at acidic pH (4.5). The limit of detection (LOD) was found to be 1.9 µg L -1 . The estimated intra-day and inter-day precisions are 3.6% and 1.7%, respectively. Moreover, the adsorbent was regenerated and reused for 5 cycles without any significant change in the capacity and repeatability. The adsorption mechanism was described based on various techniques such as FT-IR, PXRD, SEM/EDS, ICP-AES, and XPS analyses as well as density functional theory (DFT) calculations. Notably, as a case study, the obtained UiO-66-Pyta after palladium adsorption, UiO-66-Pyta-Pd, was used as an efficient catalyst for Suzuki-Miyaura cross-coupling reaction.

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Section: Introductionmentioning

confidence: 99%

A Pyridyltriazol Functionalized Zirconium Metal–Organic Framework for Selective and Highly Efficient Adsorption of Palladium

Daliran

Ghazagh-Miri

Oveisi

et al. 2020

ACS Appl. Mater. Interfaces

128

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“…Molecular structures of animals and human cells are reported to be negatively affected when gold ions are ingested [6]. Also, carcinogenic effects in plant roots and animals are diagnosed with palladium ions [6] [9]. In turn, the whole food chain is reported to be adversely affected as a result of these precious metal ions, hence making it critical to recover these metal ions from industrial effluent not only because of the rise in demand but also to mitigate the health effects associated with them.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Iron Oxide Nanoparticles Modified with Moringa Seed Proteins for Recovery of Precious Metal Ions

Amuanyena¹,

Kandawa‐Schulz²,

Kwaambwa³

2019

JBNB

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Precious metals are highly demanded economic value metals that require to be recovered from industrial wastes and electronic used products (e-waste). They are such as gold (Au) as well as Platinum Group Metals (PGMs) for instance palladium (Pd) and platinum (Pt). The study was conducted to test the magnetic iron oxide nanoparticles modified with Moringa oleifera seed proteins as adsorbent for recovery of Au(III), Pd(II) and Pt(IV) from aqueous solutions. Different functional groups responsible for adsorption, morphology, thermal stability, and surface charges of the nanoparticles were characterized with FTIR, SEM, TGA and Zeta potential respectively. Batch adsorption method was used, and precious metal ions percentage recovery was measured using ICP-OES. The effects of pH, initial adsorbate concentration, adsorption agitation time and adsorbent dosage were studied at room temperature of 25˚C. Au(III) yielded a maximal recovery of 99.8%, followed by Pt(IV) with 87.7%, then Pd(II) with 72.7% at a pH 2.5, 10 mg/L initial adsorbate concentration, 120 minutes agitation time and 0.065 g adsorbent dosage. These results suggested that modified iron oxide nanoparticles were effective in selective recovery of the precious metal ions.

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“…Research efforts investigating more sustainable methods for recovering palladium have primarily focused on hydrometallurgy, as it is typically less energy-intensive and offers greater potential for selectivity. The wide range of strategies employed in hydrometallurgical palladium recovery have been reviewed [48][49][50][51]85,86]. Consequently, the remainder of this overview will focus on examples reporting a direct application of the recovered palladium in catalysis.…”

Section: Palladium From Secondary Sourcesmentioning

confidence: 99%

From Waste to Green Applications: The Use of Recovered Gold and Palladium in Catalysis

et al. 2021

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The direct use in catalysis of precious metal recovery products from industrial and consumer waste is a very promising recent area of investigation. It represents a more sustainable, environmentally benign, and profitable way of managing the low abundance of precious metals, as well as encouraging new ways of exploiting their catalytic properties. This review demonstrates the feasibility and sustainability of this innovative approach, inspired by circular economy models, and aims to stimulate further research and industrial processes based on the valorisation of secondary resources of these raw materials. The overview of the use of recovered gold and palladium in catalytic processes will be complemented by critical appraisal of the recovery and reuse approaches that have been proposed.

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

Cited by 72 publications

References 117 publications

A Pyridyltriazol Functionalized Zirconium Metal–Organic Framework for Selective and Highly Efficient Adsorption of Palladium

A Pyridyltriazol Functionalized Zirconium Metal–Organic Framework for Selective and Highly Efficient Adsorption of Palladium

Magnetic Iron Oxide Nanoparticles Modified with Moringa Seed Proteins for Recovery of Precious Metal Ions

From Waste to Green Applications: The Use of Recovered Gold and Palladium in Catalysis

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