Effective Removal of Anionic Re(VII) by Surface-Modified Ti 2 CT x MXene Nanocomposites: Implications for Tc(VII) Sequestration
Journal Article
·
· Environmental Science and Technology
- Chinese Academy of Sciences (CAS), Beijing (China). Lab. of Nuclear Energy Chemistry and Key Lab. for Biomedical Effects of Nanomaterials and Nanosafety, Inst. of High Energy Physics
- Chinese Academy of Sciences (CAS), Beijing (China). Lab. of Nuclear Energy Chemistry and Key Lab. for Biomedical Effects of Nanomaterials and Nanosafety, Inst. of High Energy Physics; Univ. of South China, Hengyang (China). School of Chemistry and Chemical Engineering and Hunan Key Lab. for the Design and Application of Actinide Complexes
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing Synchrotron Radiation Facility, Inst. of High Energy Physics
- Univ. of South China, Hengyang (China). School of Chemistry and Chemical Engineering and Hunan Key Lab. for the Design and Application of Actinide Complexes
Environmental contamination by 99Tc(VII) from radioactive wastewater streams is of particular concern due to the long half-life of 99Tc and high mobility of pertechnetate. Here in this paper, we report a novel MXene-polyelectrolyte nanocomposite with three-dimensional networks for enhanced removal of perrhenate, which is pertechnetate simulant. The introduction of poly(diallyldimethylammonium chloride) (PDDA) regulates the surface charge and improves the stability of Ti2CTx nanosheet, resulting in Re(VII) removal capacity of up to 363 mg g–1, and fast sorption kinetics. The Ti2CTx/PDDA nanocomposite furthermore exhibits good selectivity for ReO4– when competing anions (such as Cl– and SO42–) coexist at a concentration of 1800 times. The immobilization mechanism was confirmed as a sorption-reduction process by batch sorption experiments and X-ray photoelectron spectroscopy. The pH-dependent reducing activity of Ti2CTx/PDDA nanocomposite toward Re(VII) was clarified by X-ray absorption spectroscopy. As the pH increases, the local environment gradually changes from octahedral-coordinated Re(IV) to tetrahedral-coordinated Re(VII). The overall results suggest that Ti2CTx/PDDA nanocomposite may be a promising candidate for efficient elimination of Tc contamination. The reported surface modification strategy might result in applications of MXene-based materials in environmental remediation of other oxidized anion pollutants.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); Florida State Univ., Tallahassee, FL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; SC0016568
- OSTI ID:
- 1566498
- Alternate ID(s):
- OSTI ID: 1656505
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 7 Vol. 53; ISSN 0013-936X
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
charge transport
corrosion
defects
geophysics/geochemistry
magnetism and spin physics
materials and chemistry by design
mechanical behavior
nuclear
separations
superconductivity
synthesis (novel materials)
synthesis (predictive)
synthesis (scalable processing)
synthesis (self-assembly)
charge transport
corrosion
defects
geophysics/geochemistry
magnetism and spin physics
materials and chemistry by design
mechanical behavior
nuclear
separations
superconductivity
synthesis (novel materials)
synthesis (predictive)
synthesis (scalable processing)
synthesis (self-assembly)