Highly enhanced adsorption performance to uranium(VI) by facile synthesized hydroxyapatite aerogel

Xiong, Tao; Li, Qichen; Liao, Jun; Zhang, Yong; Zhu, Wenkun

doi:10.1016/j.jhazmat.2021.127184

Cited by 129 publications

(35 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…surface roughness and multilayered adsorption processes. 60 Consequently, the extraction of U(VI) on IAA-CTSA was a monolayer adsorption.…”

Section: Polymer Chemistry Papermentioning

confidence: 99%

Indole-functionalized cross-linked chitosan for effective uptake of uranium(vi) from aqueous solution

Wang

Liu

et al. 2022

Polym. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to obtain more reliable and comparable results we suggest performing the sorption experiments associated with the evaluation of qmax at a certain value in the acidic pH range such as pH 3 or pH 4; the former is preferable for aerogel materials, in order to carry out experiments with total U(VI) concentration above the mmol range, which is needed to reach the plateau of the isothermal curves and accurately evaluate qe values [38]. Indeed, the first three aerogels in terms of sorption capacity (Table 1) show maximum capacity in acidic solutions (pH 3-4), in which range UO2 2+ is the only species present [36][37][38][39].…”

Section: Ph Effectmentioning

confidence: 99%

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

Georgiou¹,

Raptopoulos²,

Anastopoulos³

et al. 2022

Preprint

View full text Add to dashboard Cite

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.

show abstract

Highly enhanced adsorption performance to uranium(VI) by facile synthesized hydroxyapatite aerogel

Cited by 129 publications

References 73 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

Indole-functionalized cross-linked chitosan for effective uptake of uranium(vi) from aqueous solution

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

Contact Info

Product

Resources

About