Graphene aerogel capsulated precipitants for high efficiency and rapid elimination of uranium from water

Wang, Zhe; Hu, Huimin; Huang, Liqin; Lin, Fanyu; Liu, Shuang; Wu, Tong; Alharbi, Njud S.; Rabah, Samar; Lu, Yuexiang; Wang, Xiangke

doi:10.1016/j.cej.2020.125272

Cited by 70 publications

(17 citation statements)

References 37 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%

“…6−34 Aerogels have also been used for the photocatalytic conversion of soluble uranium species to insoluble nanoparticles that can float on water 35 and as hosts of reagents that leach out and cause precipitation of uranium from water. 36 Recently, a new class of aerogel materials was introduced, referred to as polyurea (PUA)-cross-linked biopolymer (Xbiopolymer) aerogels. 37−39 X-biopolymer (alginate or chitosan) aerogels were prepared following the principles of the polymer-cross-linked (X-aerogel) technology that had been developed for silica 40−42 and other metal oxides, 43−47 but it was also demonstrated, albeit not systematically, with a couple of synthetic polymers.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…[8,9] The presence of a high concentration of U 6+ in the human body increases the risk of cancer and is nephrotoxic in nature. [10] The presence of a high concentration of Pb 2+ causes anemia, renal impairment, immune toxicity, hypertension, and reproductive organ toxicity. Pb 2+ is thought to have irreversible neurological and behavioral effects.…”

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confidence: 99%

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

Patel

Sutar

Maharana

2022

J Chinese Chemical Soc

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The current research work deals with the synthesis of a novel composite material of carboxylic graphene oxide-carboxymethyl chitosan (COOH-GO-CMC) composite by ultrasound and microwave-assisted processes. The composite was characterized by Fourier Transform Infra-red spectroscopy, X-ray Powder Diffraction, Raman Spectroscopy, Scanning Electron Microscopy, and X-ray Photoelectron Spectroscopy. The synthesized composite was used to remove heavy toxic metal ions (HTMIs) such as uranium (U 6+ ), lead (Pb 2+ ), chromium (Cr 6+ ), and cadmium (Cd 2+ ) ions from aqueous solutions. The HTMIs removal study was carried out to verify the effects of pH, contact time, amount of adsorbent dose, initial concentration, and temperature. The linear and nonlinear Langmuir and Freundlich adsorption isotherms were fitted to the data of removal studies, and it was observed that the linear Langmuir adsorption isotherm (R 2 > 0.99) was the best-fitted model. The maximum adsorption capacities of COOH-GO-CMC were found to be 74. 62, 416.66, 76.92, and 53.47 mg g À1 for U 6+ , Pb 2+ , Cr 6+ , and Cd 2+ ions, respectively. The kinetics studies, including four types of models (linear and nonlinear pseudo-firstorder, linear and nonlinear pseudo-second-order, Intraparticle diffusion, and Elovich kinetic models), were tested, and the results showed that the linear pseudo-second-order kinetics model (R 2 > 0.99) was the best-fitted model. The thermodynamic studies reveal that the adsorption of HTMIs is a spontaneous (ΔG < 0) and exothermic (ΔH < 0 and ΔS > 0) process in nature.adsorption isotherm, carboxymethyl chitosan, graphene oxide, heavy metal ion removal | INTRODUCTIONAny metallic element with a comparatively high density that is toxic or poisonous even at low concentrations is referred to as "heavy metal." Heavy metals are defined as metals with an atomic number greater than 20 and an atomic density greater than 4 g cm À3 , or 5 times the density of water. [1] As a result of rapid industrialization, hazardous contaminants are discharged in large quantities into different water bodies. As these contaminants are non-degradable, toxic, cancer-causing agents, and difficult to remove from water, heavy toxic metal ions

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“…It has to be noted that extremely high qmax values have been reported for inorganic (hydroxyapatite) [36,37] as well as for biopolymer-based (X-alginate) [38] and carbon-based aerogels [39]. The only higher value than the above (qmax= 3550 g kg -1 ) has been reported for graphene-based aerogels, which however act not as adsorbents, but as hosts of reagents that leach out of the aerogel matrix and cause precipitation of uranium from water [72].…”

Section: Sorption Isothermsmentioning

confidence: 97%

“…Recently, and more intensively in the last decade, aerogels of various chemical compositions and nanostructures have been tested for uranium adsorption and recovery from wastewater and seawater, sometimes with impressive performances . Aerogels have also been used for the photocatalytic conversion of soluble uranium species to insoluble nanoparticles that can float on water [71] and as hosts of reagents that leach out and cause precipitation of uranium from water [72].…”

Section: Introductionmentioning

confidence: 99%

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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Graphene aerogel capsulated precipitants for high efficiency and rapid elimination of uranium from water

Cited by 70 publications

References 37 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

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

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

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Graphene aerogel capsulated precipitants for high efficiency and rapid elimination of uranium from water

Cited by 70 publications

References 37 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

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U6+, Pb2+, Cr6+, and Cd2+ ions from aqueous solutions

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

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Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions