Quaternization of algal/PEI beads (a new sorbent): Characterization and application to scandium sorption from aqueous solutions

Hamza, Mohammed F.; Wei, Yuezhou; Guibal, Eric

doi:10.1016/j.cej.2019.123210

Cited by 47 publications

(36 citation statements)

References 66 publications

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“…High-resolution spectra (HRES) (and the assignments of deconvoluted peaks) for selected signals are also shown in Tables S2 and S2. These data were previously discussed [41]. Tables S4 and S5 discuss the HRES of XPS spectra of relevant signals after uranyl binding.…”

Section: Xps Analysismentioning

confidence: 70%

“…As reported above, the appearance of S 2p signal on metal-loaded sorbent at 167.25 eV (which is assigned to sulfate groups [59][60][61][62]) means that sulfate (as well as HSO4 − ) probably binds onto the quaternary ammonium groups at the surface of the sorbent at pH 4 (see Scheme High-resolution spectra (HRES) (and the assignments of deconvoluted peaks) for selected signals are also shown in Tables S2 and S3. These data were previously discussed [41]. Tables S4 and S5 discuss the HRES of XPS spectra of relevant signals after uranyl binding.…”

Section: Xps Analysismentioning

confidence: 70%

“…Despite the presence of amine groups, hydroxyls and carboxylic groups on APEI, both the crosslinking of amine groups with glutaraldehyde, and the possible interactions between protonated amine groups and carboxylic groups contribute to reduce the reactivity of functional groups. The quaternization increases the density of amine groups (from 4.15 to 6.12 mmol N g −1 ) [41]. Branched PEI is constituted of primary/secondary/tertiary amine groups (according to the distribution: 1/2/1, with pK a values: 4.5, 6.7, and 11.6, respectively [66]).…”

Section: Ph Effectmentioning

confidence: 99%

“…Figure 4 shows that the equilibrium is reached under selected experimental conditions within 30-40 min. The mesoporous structure of the sorbent [41] may explain the readily transfer of metal ions through the sorbent. Sorption may be controlled by the resistance to film diffusion, the resistance to intraparticle diffusion but also by the proper reaction rate.…”

Section: Sorption Mechanismmentioning

confidence: 99%

“…More recently, APEI was quaternized by grafting glycidyltrimethylammonium moieties on the composite beads (Q-APEI). This sorbent was efficiently tested for the sorption of Sc(III), especially for the recovery of the metal from complex effluent issued from the treatment of red mud [41]. The properties of these materials have been fully characterized in terms of composition (elemental analysis, FTIR, and XPS), textural properties and thermogravimetric analysis.…”

Section: Introductionmentioning

confidence: 99%

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Quaternization of Composite Algal/PEI Beads for Enhanced Uranium Sorption—Application to Ore Acidic Leachate

Hamza

Mubark

Wei

et al. 2020

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The necessity to recover uranium from dilute solutions (for environmental/safety and resource management) is driving research towards developing new sorbents. This study focuses on the enhancement of U(VI) sorption properties of composite algal/Polyethylenimine beads through the quaternization of the support (by reaction with glycidyltrimethylammonium chloride). The sorbent is fully characterized by FTIR, XPS for confirming the contribution of protonated amine and quaternary ammonium groups on U(VI) binding (with possible contribution of hydroxyl and carboxyl groups, depending on the pH). The sorption properties are investigated in batch with reference to pH effect (optimum value: pH 4), uptake kinetics (equilibrium: 40 min) and sorption isotherms (maximum sorption capacity: 0.86 mmol U g−1). Metal desorption (with 0.5 M NaCl/0.5 M HCl) is highly efficient and the sorbent can be reused for five cycles with limited decrease in performance. The sorbent is successfully applied to the selective recovery of U(VI) from acidic leachate of uranium ore, after pre-treatment (cementation of copper, precipitation of rare earth elements with oxalate, and precipitation of iron). A pure yellow cake is obtained after precipitation of the eluate.

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Section: Xps Analysismentioning

confidence: 70%

Section: Xps Analysismentioning

confidence: 70%

Section: Ph Effectmentioning

confidence: 99%

Section: Sorption Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quaternization of Composite Algal/PEI Beads for Enhanced Uranium Sorption—Application to Ore Acidic Leachate

Hamza

Mubark

Wei

et al. 2020

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Synergistic Nanoarchitectonics: Precision Membrane Engineering for Rare Earth Selective Separation

Lv,

Zhang,

Gao

et al. 2024

Adv Funct Materials

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Rare earth elements (REEs) are vital in high‐tech industries and defense due to their strategic significance. Crafting an efficient membranes channel for REE separation poses a significant challenge. Employing 2‐methylimidazole‐hydrolyzed OH−, dopamine polymerization is initiated and then Zn2+ coordinates with 2‐methylimidazole on PDA surfaces. The confined symbiotic reaction yields 2D vertical heterojunctions of GO/ZIF‐8/PDA (G/Z/P). During separation, partially dehydrated smaller hydrated lanthanide ions preferentially access interlayers, expanding and stabilizing the interlayer space by coordinating with PDA, thus excluding larger hydrated scandium ions from the membranes. Some scandium ions entering interlayer channels are sequestered by N in size‐matched ZIF‐8 pores. This distinctive mechanism facilitates selective scandium separation from other REEs (other REEs/Sc selectivity ≈68.73), achieving nearly complete Sc3+ rejection in a single step. The methodology offers unprecedented insights into precise nano‐space material synthesis, indicating promising strides in advancing scandium production.

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A Phosphine‐Amine‐Linked Covalent Organic Framework with Staggered Stacking Structure for Lithium‐Ion Conduction

Tan,

Weng,

Zhu

et al. 2023

Angewandte Chemie

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In‐plane ionic conduction over two‐dimensional (2D) materials is desirable for flexible electronics. Exfoliating 2D covalent organic frameworks (COFs) towards a few layers is highly anticipated, whereas most examples remain robust via π‐stacking against the interlayered dislocation. Herein, we synthesize a phosphine‐amine‐linked 2D COF by a nucleophilic substitution reaction of phosphazene with amines. The synthesized COF is crystalline, and stacks in an AB‐staggered fashion, wherein the AB dual layers are interlocked by embedding P−Cl bonds from one to another layer, and the non‐interlocked layers are readily delaminated. Therefore, in situ post‐quaternization over phosphazene can improve the ionization of backbones, accompanied by layered exfoliation. The ultrathin nanosheets can decouple lithium salts for fast solid‐state ion transport, achieving a high conductivity and low activation energy. Our findings explore the P−N substitution reaction for COF crystallization and demonstrate that the staggered stacking 2D COFs are readily exfoliated for designing solid electrolytes.

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Quaternization of algal/PEI beads (a new sorbent): Characterization and application to scandium sorption from aqueous solutions

Cited by 47 publications

References 66 publications

Quaternization of Composite Algal/PEI Beads for Enhanced Uranium Sorption—Application to Ore Acidic Leachate

Quaternization of Composite Algal/PEI Beads for Enhanced Uranium Sorption—Application to Ore Acidic Leachate

Synergistic Nanoarchitectonics: Precision Membrane Engineering for Rare Earth Selective Separation

A Phosphine‐Amine‐Linked Covalent Organic Framework with Staggered Stacking Structure for Lithium‐Ion Conduction

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