Surface modification of ionic liquid-spun chitin fibers for the extraction of uranium from seawater: seeking the strength of chitin and the chemical functionality of chitosan

Barber, Peter W.; Kelley, Steven P.; Griggs, Chris S.; Wallace, Sergei; Rogers, Robin D.

doi:10.1039/c4gc00092g

Cited by 127 publications

(84 citation statements)

References 33 publications

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“…Among these methods, development of uranium adsorption materials containing the amidoxime functional group has the highest potential because of its high chelating affinity and selectivity toward uranium. [1d,7] Amidoxime groups are mainly generated by treating the nitrile group with hydroxylamine . Amidoxime groups have been displayed on a variety of supporting materials (such as polymeric fibers, porous polymers, magnetic microspheres, hydrogels, and metal organic frameworks) and exhibit excellent specificity and capacity for uranium sequestration.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of Porous Nanofiber Adsorbent by Blow‐Spinning with Ultrahigh Uranium Recovery Capacity from Seawater

Yuan

Zhao

Wen

et al. 2018

Adv Funct Materials

207

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Highly efficient recovery of uranium from seawater is of great concern because of the growing demand for nuclear energy. The use of amidoximebased polymeric fiber adsorbents is considered to be a promising approach because of their relatively high specificity and affinity to uranyl. The surface area, hydrophility, and surface charge of the adsorbent are reported to be critical factors that influence uranium recovery efficiency. Here, a porous amidoxime-based nanofiber adsorbent (SMON-PAO) that exhibits the highest uranium recovery capacity among the existing fiber adsorbents both in 8 ppm uranium spiked seawater (1089.36 ± 64.31 mg-U per g-Ads) and in natural seawater (9.59 ± 0.64 mg-U per g-Ads) is prepared by blow spinning. These nanofibers are obtained by compositing polyacrylamidoxime with montmorillonite and exhibit the increased surface area and more exposed functional amidoxime moieties for uranyl adsorption. The residual montmorillonite enhances the hydrophility and reduces the negative surface charge, thereby increasing the contact of the adsorbent with seawater and reducing the charge repulsion between negative amidoxime group and negative uranyl species ([UO 2 (CO 3 ) 3 ] 4− ). The finding of this study indicates that rational design of uranium recovery adsorbents by comprehensive utilizing the key factors that influence uranium recovery performance is a promising approach for developing economically feasible uranium recovery materials.

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Section: Introductionmentioning

confidence: 99%

Rational Design of Porous Nanofiber Adsorbent by Blow‐Spinning with Ultrahigh Uranium Recovery Capacity from Seawater

Yuan

Zhao

Wen

et al. 2018

Adv Funct Materials

207

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“…Another objective of the presentw ork was to study the properties of ionic liquids, as they have been shown to have potentiala pplicationsi nv ariousf ields including electrochemistry, [29,30] catalysts, [31] synthesis, [32,33] and separation, [34,35] both as solvents/media and as reactants. In this work, the ionic liquid selected was 1-ethyl-3-methylimidazoliumb is(trifluoromethylsulfonyl)imide ([Emim][Tf 2 N]), which has prospects for application in electrochemistry and its conductivity is comparable to that of the best organic electrolyte solutions.…”

Section: Introductionmentioning

confidence: 99%

Evidence that Acetonitrile is Sensitive to Different Interaction Sites of Ionic Liquids as Revealed by Excess Spectroscopy

et al. 2017

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By studying the interactions between an ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and a co-solvent acetonitrile, the C≡N stretching vibration is found to be sensitive to different interaction sites as shown by excess infrared spectroscopy. Four existing forms of acetonitrile molecules are identified and a detailed transformation process of the ionic liquid upon dilution is obtained. Such characteristics of the nitrile group are discussed from the viewpoint of its ability to form hydrogen bonds with proton donors. It is believed that this is due to the intermediate charge donating ability of the C≡N group as compared with other groups such as S=O, CH , and aromatic C-H.

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“…10 The high capacity absorbance of chitin bers functionalized with a uranyl-selective amidoxime group used for the extraction of uranium from seawater has been reported. 11 The hydrophobic of the modied chitin surface leads to the highly effective separation of oil from water. 12 An amphiphilic chitosan surface has been achieved by graing hydrophilic polyacrylamide and hydrophobic polystyrene to allow reversible switching in polar and non-polar media.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence control of chitin and chitosan fabricatedviasurface functionalization using direct oxidative polymerization

Hai

Sugimoto

2018

RSC Adv.

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The copolymer of 3-hexylthiophene (3HT) and fluorene (F) was directly grafted onto chitin and chitosan using FeCl 3 as an oxidant. The properties of the grafted chitin/chitosan were characterized by Fourier transform infrared (FT-IR) spectroscopy, UV-Vis spectroscopy, fluorescence spectroscopy, X-ray diffraction analysis, thermogravimetric analysis (TGA), transmission electron microscopy-energy dispersive X-ray spectroscopy, and quantum yield measurements. The UV-Vis absorption peaks of the chitin/chitosan grafted with 3-hexylthiophene and fluorene copolymer were increasingly blue-shifted upon increasing the fluorene content and the red-shifted emission of the grafted chitin/chitosan were controlled by varying the monomers feed of the 3HT/F units. The hypsochromic and bathochromic shifts of chitin/chitosan were ascribed to the (3HT/F) moieties grafted to their surface. The quantum yield of grafted chitin/chitosan increased upon increasing the fluorene content. The TGA and XRD analysis revealed that the thermal stability and crystallinity of chitin/chitosan decreased upon grafting the copolymer of fluorene and 3-hexylthiophene. This article represents a simple route towards the surface modification of chitin and chitosan using conducting copolymers, providing multicolor chitin and chitosan via a one-step reaction.

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Surface modification of ionic liquid-spun chitin fibers for the extraction of uranium from seawater: seeking the strength of chitin and the chemical functionality of chitosan

Abstract: A platform was developed for the surface modification of ionic liquid-spun chitin fibers, that provides the physical properties of chitin with chitosan's functional properties on the surface.

Cited by 127 publications

References 33 publications

Rational Design of Porous Nanofiber Adsorbent by Blow‐Spinning with Ultrahigh Uranium Recovery Capacity from Seawater

Rational Design of Porous Nanofiber Adsorbent by Blow‐Spinning with Ultrahigh Uranium Recovery Capacity from Seawater

Evidence that Acetonitrile is Sensitive to Different Interaction Sites of Ionic Liquids as Revealed by Excess Spectroscopy

Fluorescence control of chitin and chitosan fabricatedviasurface functionalization using direct oxidative polymerization

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