Uranium extraction from nitrate media using amine functionalized poly acrylate hydrogel / nano silica

Fatah, A. I. L. Abd El; Elashry, Soaad M.; Hashem, Mohamed D.; Kouraim, Mohamed N.

doi:10.1080/01496395.2021.1982977

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…[37][38][39] Most of the biomass hydrogel adsorbents studied at present are prepared by chemical cross-linking of biomass raw material using toxic chemical crosslinkers, which could result in secondary environmental pollution due to the difficulty of removing the residual cross-linkers thoroughly from hydrogels. [40][41][42] On the other hand, physical hydrogels are cross-linked by noncovalent bonds such as hydrophobic interaction, electrostatic interaction, and hydrogen bonding, which are free of chemical contaminants including initiators and crosslinkers. Simultaneously, the physical hydrogels originated from biomass are environmentally friendly and degradable.…”

Section: Introductionmentioning

confidence: 99%

Construction mechanism of gellan gum/chitosan/calcium ion multiple‐network hydrogel by self‐assembly strategy and its regulation

Liang,

Lin

et al. 2023

Polymer Engineering & Sci

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Recently, double‐network or multiple‐network hydrogel constructed by physical methods has been considered a green method to improve the comprehensive properties of biomass hydrogel. Herein, a novel physically cross‐linked hydrogel with multiple network of gellan gum/chitosan/calcium ion (GG–CS–Ca) was constructed by self‐assembly to accomplish the synergistic improvement of mechanical strength and uranium adsorption property compared to adsorbents GG–Ca and carboxymethyl konjac glucomannan/GG–Al originated from gellan gum previously prepared. Moreover, the driving mechanism of self‐assembly of GG–CS–Ca was deduced by 13C solid state nuclear magnetic resonance spectroscopy (13C‐SSNMR), rheological analysis, and phase transition analysis. The results indicated electrostatic interaction was dominant during the self‐assembly of GG–CS–Ca. The self‐assembly mechanism was also illustrated by investigating the x‐ray photoelectron spectrometer (XPS) combined with the analysis of the phase transition process. Comprehensively, the self‐assembly constructed GG–CS–Ca hydrogel network contained three kinds of network including the GG–CS network constructed by electrostatic action of protonated CS with negative charged GG, the GG–Ca network constructed by ionic cross‐linking of COO− in GG and Ca2+, and the GG network formed after the phase transformation of GG hot sol by cooling. It explored a new method for constructing biomass‐based physical hydrogels with both favorable mechanical strength and uranium adsorption capacity in uranium removal.Highlights A novel physically cross‐linked hydrogel (GG–CS–Ca) with multiple network was constructed by self‐assembly. The GG–CS–Ca hydrogel accomplished the synergistic improvement of mechanical strength and uranium adsorption properties. The self‐assembly mechanism of constructing the GG–CS–Ca hydrogel network contained three aspects. The electrostatic interaction was the dominant action during the self‐assembly of GG–CS–Ca.

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Section: Introductionmentioning

confidence: 99%

Construction mechanism of gellan gum/chitosan/calcium ion multiple‐network hydrogel by self‐assembly strategy and its regulation

Liang,

Lin

et al. 2023

Polymer Engineering & Sci

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La (III) Separation by Tri Octyl Phosphine Oxide (Cyanex 921) Based on Amberlite Xad-4 Chelating Resin

Fatah

Elashry

2022

J Inorg Organomet Polym

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The novel core–shell type polymeric supports with accessible phosphorus groups were synthesised in the search for new reactive materials designed for the synthesis of functional resins. Amberlite XAD-4 adsorbent was impregnated with tri octyl phosphine oxides (Cyanex 921), which were then polymerized in the polymer carrier structure. The syntheses were evaluated by capturing FT-IR spectra, SEM micrographs, and analysing the sorption process. Batch studies were conducted to study the influence of some factors like pH, contact time, the metal ions concentration, and temperature on sorption efficiency of La (III) ions. The results showed that the optimum conditions were at pH equal to 0.5 and an equilibrium contact time of 30 min. According to the results of the sorption data analysis, the pseudo-second-order and Langmuir models were better fitted than the other estimated models. The sorption capacity of La (III) ions into impregnated resin as adsorbent martial was 54.25 mg g−1. The results revealed that the used adsorbent has been used successfully as a promising material for the elimination and recovery of La ions from the aqueous solutions. The impregnated resin exhibits a high chemical stability, reusability and fast equilibration. Further, the above procedure has been successfully employed for the application of real sample.

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Comparison of adsorption of U(VI) by magnetic MCM-41, MCM-48 and SBA-15 mesoporous silicas

Bi,

Cai,

Xiong

et al. 2024

J Radioanal Nucl Chem

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Uranium extraction from nitrate media using amine functionalized poly acrylate hydrogel / nano silica

Cited by 4 publications

References 33 publications

Construction mechanism of gellan gum/chitosan/calcium ion multiple‐network hydrogel by self‐assembly strategy and its regulation

Construction mechanism of gellan gum/chitosan/calcium ion multiple‐network hydrogel by self‐assembly strategy and its regulation

La (III) Separation by Tri Octyl Phosphine Oxide (Cyanex 921) Based on Amberlite Xad-4 Chelating Resin

Comparison of adsorption of U(VI) by magnetic MCM-41, MCM-48 and SBA-15 mesoporous silicas

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