Chitosan-based aerogel with anti-swelling for U(VI) adsorption from aqueous solution

Yang, Lirong; Huang, Chuanqun; Zhang, Lin; Ye, Yongjie; Hui, Jun; Wang, Yan

doi:10.1016/j.colsurfa.2021.127527

Cited by 26 publications

(8 citation statements)

References 72 publications

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“…Aerogel-derived adsorbents usually display high adsorption capacities for metal ions, including uranium, which is augmented by additional desirable attributes such as highly porous nanostructures, high specific surface areas, good mechanical properties, and surface functionality that can offer coordination sites. Aerogel materials that have shown adsorption of uranium(VI) include inorganic (metal oxides, chalcogens, or carbon), organic (polymer or biopolymer), or hybrid (metal oxide, metal–organic framework, or graphene/polymer or biopolymer composites) materials. − Aerogels have also been used for the photocatalytic conversion of soluble uranium species to insoluble nanoparticles that can float on water and as hosts of reagents that leach out and cause precipitation of uranium from water …”

Section: Introductionmentioning

confidence: 99%

Extremely Efficient Uranium Removal from Aqueous Environments with Polyurea-Cross-Linked Alginate Aerogel Beads

Georgiou

Raptopoulos

Παπαστεργίου

et al. 2022

ACS Appl. Polym. Mater.

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The removal of uranium(VI) from laboratory and environmental waters using polyurea-cross-linked calcium alginate (X-alginate) aerogels has been investigated by means of batch-type experiments. The experimental data revealed that the material presents extremely high adsorption capacity for uranium(VI) (up to 2023 g kg −1 of aerogel). The adsorption process is endothermic, entropy-driven, and follows the Langmuir isotherm model. The Fourier transform infrared spectroscopy (FTIR) data corroborate the results of the batch experiments and indicate that adsorption occurs via the formation of inner-sphere complexes between the surface functional groups of Xalginate beads and UO 2 2+. The post-adsorption presence of uranium in the adsorbent was confirmed and quantified with energy-dispersive X-ray spectra (EDS) analysis. Compared to other aerogel adsorbents of UO 2 2+ from the literature, X-alginate aerogels show one of the highest sorption capacities per weight and the highest per volume. Uranium could be recovered almost quantitatively (∼100%) in aqueous solutions of Na 2 CO 3 (pH 11) or ethylenediaminetetraacetic acid (EDTA) (pH 10). The aerogel material has been effectively applied for the removal of uranium(VI) from acid mine drainage (AMD), groundwater, and seawater samples. It should be noted that X-alginate aerogel beads are stable in all of the above environments (i.e., no swelling, shrinking, or disintegration was observed). The extraordinary adsorption capacity, even in the presence of competing metal cations, and the stability of X-alginate aerogel beads in environmental waters render them excellent candidates for the specific application.

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Section: Introductionmentioning

confidence: 99%

Extremely Efficient Uranium Removal from Aqueous Environments with Polyurea-Cross-Linked Alginate Aerogel Beads

Georgiou

Raptopoulos

Παπαστεργίου

et al. 2022

ACS Appl. Polym. Mater.

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“…With the exception of one study only [61], all other studies up to now indicate that U(VI) sorption by aerogel materials is an endothermic, entropy-driven process and it is favoured with increasing temperature [38,39,49,51,52,54,55,58,61,62,64,65,67,68]. ΔH o values can be as high as 141 kJ mol -1 and ΔS o values can be as high as 500 J K -1 mol -1 (Table 2).…”

Section: Temperature Effect and Sorption Thermodynamicsmentioning

confidence: 94%

“…Regarding FTIR, peak shifts and relative changes in peak intensities of surface-active groups (e.g., -COOH, -OH,) as well as the appearance of the characteristic uranyl (O=U=O) vibration in the spectrum after uranium sorption are employed to evaluate the adsorption mechanism. Interestingly, the peak shift of the uranyl moiety differs significantly from one type of aerogel to another and the values of the peak maximum vary between 895 cm -1 and 918 cm -1 [37,38,43,52,58,61,63,65]. On the other hand, changes in the relative area and binding energy of carbon and oxygen peaks associated with surface active moieties after U(VI) adsorption are used as a clear indication for surface complex formation [40,43,48,58,65].…”

Section: Spectroscopic Studies and Sorption Mechanismmentioning

confidence: 99%

“…Interestingly, the peak shift of the uranyl moiety differs significantly from one type of aerogel to another and the values of the peak maximum vary between 895 cm -1 and 918 cm -1 [37,38,43,52,58,61,63,65]. On the other hand, changes in the relative area and binding energy of carbon and oxygen peaks associated with surface active moieties after U(VI) adsorption are used as a clear indication for surface complex formation [40,43,48,58,65]. In addition, the peaks at 383 eV in the high-resolution XPS spectra associated with U4f are used to indicate complexation with surface groups [61].…”

Section: Spectroscopic Studies and Sorption Mechanismmentioning

confidence: 99%

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Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents – A critical review

Georgiou¹,

Raptopoulos²,

Anastopoulos³

et al. 2022

Preprint

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Aerogel-based adsorbents present extraordinary sorption capacity for hexavalent uranium that can be as high as 8.8 mol kg–1 (2088 g kg–1). The adsorption data follow generally the Langmuir isotherm model and the kinetic data are better described by the pseudo-second-order kinetic model, which is associated with chemisorption. Evaluation of the thermodynamic data reveals that the adsorption is generally an endothermic, entropy-driven process (ΔHo, ΔSo > 0). Spectroscopic studies (e.g., FTIR, XPS) indicate that the adsorption is based on the formation of in-ner-sphere complexes between surface active moieties and the uranyl cation. Regeneration and uranium recovery by acidification and complexation using carbonate or chelating ligands (e.g., EDTA) have been found to be successful. The application of aerogel-based adsorbents to uranium removal from industrial processes and uranium-contaminated waste waters was also successful, assuming that these materials could be very attractive as adsorbents in water treatment and uranium recovery technologies. However, the selectivity of the studied materials towards hexavalent uranium is limited suggesting further development of aerogel materials which could be modified by surface derivatization with chelating agents (e.g., salophen, iminodiacetate) presenting high selectivity for uranyl moieties.

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“…In addition, some of these studies include the possible recovery of uranium and reusability of the aerogel adsorbent, as well as the employment of spectroscopic techniques in order to identify the surface species formed after the adsorption and get insight into the sorption mechanism. Table 1 summarizes the experimental parameters and thermodynamic data evaluated from the published studies on uranium adsorption by several aerogel materials [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ].…”

Section: Uranium Sorption By Aerogelsmentioning

confidence: 99%

Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents—A Critical Review

et al. 2023

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Aerogels are a class of lightweight, nanoporous, and nanostructured materials with diverse chemical compositions and a huge potential for applications in a broad spectrum of fields. This has led the IUPAC to include them in the top ten emerging technologies in chemistry for 2022. This review provides an overview of aerogel-based adsorbents that have been used for the removal and recovery of uranium from aqueous environments, as well as an insight into the physicochemical parameters affecting the adsorption efficiency and mechanism. Uranium removal is of particular interest regarding uranium analysis and recovery, to cover the present and future uranium needs for nuclear power energy production. Among the methods used, such as ion exchange, precipitation, and solvent extraction, adsorption-based technologies are very attractive due to their easy and low-cost implementation, as well as the wide spectrum of adsorbents available. Aerogel-based adsorbents present an extraordinary sorption capacity for hexavalent uranium that can be as high as 8.8 mol kg–1 (2088 g kg–1). The adsorption data generally follow the Langmuir isotherm model, and the kinetic data are in most cases better described by the pseudo-second-order kinetic model. An evaluation of the thermodynamic data reveals that the adsorption is generally an endothermic, entropy-driven process (ΔH0, ΔS0 > 0). Spectroscopic studies (e.g., FTIR and XPS) indicate that the adsorption is based on the formation of inner-sphere complexes between surface active moieties and the uranyl cation. Regeneration and uranium recovery by acidification and complexation using carbonate or chelating ligands (e.g., EDTA) have been found to be successful. The application of aerogel-based adsorbents to uranium removal from industrial processes and uranium-contaminated waste waters was also successful, assuming that these materials could be very attractive as adsorbents in water treatment and uranium recovery technologies. However, the selectivity of the studied materials towards hexavalent uranium is limited, suggesting further developments of aerogel materials that could be modified by surface derivatization with chelating agents (e.g., salophen and iminodiacetate) presenting high selectivity for uranyl moieties.

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Chitosan-based aerogel with anti-swelling for U(VI) adsorption from aqueous solution

Cited by 26 publications

References 72 publications

Extremely Efficient Uranium Removal from Aqueous Environments with Polyurea-Cross-Linked Alginate Aerogel Beads

Extremely Efficient Uranium Removal from Aqueous Environments with Polyurea-Cross-Linked Alginate Aerogel Beads

Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents – A critical review

Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents—A Critical Review

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