Adsorption of Rare Earth Elements onto DNA-Functionalized Mesoporous Carbon

Unsworth, Colin; Kuo, Chin Chen; Kuzmin, Alexei; Khalid, Syed; Saha, Dipendu

doi:10.1021/acsami.0c09393

Cited by 35 publications

(10 citation statements)

References 35 publications

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“…In our previous work, we have also demonstrated that different REEs, including Nd and Dy, can be adsorbed on phosphorus-functionalized activated carbon and DNA-grafted mesoporous carbon. Our X-ray absorption near-edge structure (XANES) analysis confirmed that the oxidation state is not altered in the DNA-grafted carbon and EXAFS confirmed the binding of Nd with O and P functionalities …”

Section: Introductionsupporting

confidence: 55%

“…In addition, it is also observed that an adsorbed amount followed the trend of Lu < Dy < La. It essentially suggests that the adsorbed amount increases with the increase in the atomic radius (Lu = 173 pm; Dy = 178 pm; La = 187 pm) . This effect has been further elaborated in Figure c.…”

Section: Resultsmentioning

confidence: 61%

“…It essentially suggests that the adsorbed amount increases with the increase in the atomic radius (Lu = 173 pm; Dy = 178 pm; La = 187 pm). 24 This effect has been further elaborated in Figure 5c. It demonstrates that adsorbed amounts increase within the atomic radius for all the concentrations.…”

Section: Resultsmentioning

confidence: 62%

“…This trend is in line with our previous work. 24 In addition, it has also been noticed that amounts decrease with an increase in the density (Lu 30 = 9.7 g/cm 3 ; Dy 31 = 8.6 g/cm 3 ; La 32 = 6.18 g/cm 3 ) as density decreases with the increase in the atomic size.…”

Section: Resultsmentioning

confidence: 99%

“…Our X-ray absorption near-edge structure (XANES) analysis confirmed that the oxidation state is not altered in the DNA-grafted carbon and EXAFS confirmed the binding of Nd with O and P functionalities. 24 In this study, we have grafted a single-stranded oligo consisting of 100 thymine units and an amino C6 linker on the carboxylated mesoporous carbon synthesized by a softtemplating approach. The reason for choosing mesoporous carbon is that the large (meso)pores will facilitate both the grafting and transport of oligos in the course of synthesis.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Adsorption of Rare-Earth Elements in Oligo-Grafted Mesoporous Carbon

et al. 2021

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Rare-earth elements (REEs) are 17 elements of the periodic table primarily consisting of lanthanides. In modern society, the usage of REEs is ubiquitous in almost all modern gadgets and therefore efficient recovery and separation of REEs are of high importance. Selective adsorption and chelation of REEs in solid sorbents is a unique and sustainable process for their recovery. In this work, single-stranded oligos with 100 units of thymine were grafted onto carboxylated mesoporous carbon to synthesize a sorbent with phosphorus and oxygen functionalities. The sorbent was characterized by X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and scanning electron microscopy-energy-dispersive X-ray spectroscopy. Three different REEs with varying atomic radii and densities, Lu, Dy, and La, were adsorbed onto the carbon from aqueous solutions. It was observed that the adsorbed amounts increased with the increase in the atomic radius or decrease in the atomic density. Calculation of the distribution coefficients for all the equilibrium adsorption amounts suggested that adsorption is more effective in the lower concentration region. The L3-edge X-ray absorption near-edge structure confirmed a 3+ oxidation state of REEs in the adsorbed phase. Extended X-ray absorption fine structure (EXAFS) confirmed the binding of REEs with oxygen functionalities in the adsorbed phase. The radial distribution functions calculated from the EXAFS data suggest a longer RE–O distance for La compared to those for Lu and Dy. The coordination numbers and Debye–Waller factors have typical values of about 8–9 atoms and 0.01–0.02 Å2, respectively.

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Section: Introductionsupporting

confidence: 55%

Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding the Adsorption of Rare-Earth Elements in Oligo-Grafted Mesoporous Carbon

et al. 2021

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Efficient Separation of Adjacent Rare Earths in One Step by Using Ion‐microporous Metal–Organic Frameworks

Song,

Yang,

et al. 2024

Adv Funct Materials

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High‐purity rare earth (REEs) materials are key raw materials for the development of cutting‐edge technologies. However, due to similar physical and chemical properties, separating adjacent REEs from actual samples faces a formidable challenge. To overcome this challenge, an ion‐microporous metal–organic framework (ATZ‐BTC‐Zn; MOFs) is designed and synthesized, featuring densely packed nano‐trap pockets constructed from non‐coordinating carboxyl and amino groups. The synergistic effect of open nano‐trap pockets and suitable ions channel in ATZ‐BTC‐Zn is highly responsive to the size variation of lighter REEs. Notably, the configuration of Zn(H2O)62+ counterion in ATZ‐BTC‐Zn is similar to lanthanide hydrated ions (Ln(H2O)63+), facilitating the efficient ion exchange between them in the high‐speed ion transport channel. This accelerates the diffusion of REEs within the MOF pores, enhancing the utilization of active adsorption sites and promoting the efficient capture of adjacent REEs by nano‐traps. The binary model experiments show high separation factors for adjacent REEs (SFLa/Nd = 908, SFCe/La = 543), demonstrating efficient separation by ATZ‐BTC‐Zn in one step. This capability achieves the selective separation of adjacent REEs in tailings wastewater, providing a strategy to infer the compatibility between MOFs and REEs.

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Sustainable Recovery of Rare Earth Metals from Smartphone Display using Nanoengineered Cellulose

Bose,

Ariya

2024

Advanced Sustainable Systems

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Recycling rare earth elements (REEs) from electronic waste has gained significant attention over the last decade. A sustainable, fast, and selective extraction technique for rare earth metals hardly exists despite that. This work shows a selective rare earth metal recovery from a mobile phone display using a carboxylate functionalized cellulose (CFC). The nanoengineered CFC is water‐dispersible and prepared from affordable, readily available cellulose precursor. It is shown that the REEs present in the mobile phone display instantaneously form a precipitate with CFC, which is easily separated by centrifugation. As low as 150 ppm, the total concentration of REEs in the leachate is required to form a precipitate. The total removal capacity of the REEs in the leachate is 252 ± 4 mg per gram of CFC. In addition, the precipitate formation occurs within 10 s, which to our knowledge, is the best‐reported removal time so far. It is observed that when the total concentration of the REEs in the leachate is 150 ppm or above, the removal capacity of CFC is quite efficacious and unperturbed by the presence of other metal ions. Solar electrodeposition method is utilized to recover rare earth metal and their oxide from the precipitate.

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Adsorption of Rare Earth Elements onto DNA-Functionalized Mesoporous Carbon

Cited by 35 publications

References 35 publications

Understanding the Adsorption of Rare-Earth Elements in Oligo-Grafted Mesoporous Carbon

Understanding the Adsorption of Rare-Earth Elements in Oligo-Grafted Mesoporous Carbon

Efficient Separation of Adjacent Rare Earths in One Step by Using Ion‐microporous Metal–Organic Frameworks

Sustainable Recovery of Rare Earth Metals from Smartphone Display using Nanoengineered Cellulose

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