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New insights into the sorption of U(VI) on kaolinite and illite in the presence of Aspergillus niger.
- Source :
-
Chemosphere . Feb2022:Part 1, Vol. 288, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- The regulation effect of Aspergillus niger to the sorption behavior of U(VI) on kaolinite and illite was studied through investigating the enrichment of U(VI) on kaolinite- Aspergillus niger and illite- Aspergillus niger composites. Kaolinite- or illite- A. niger composites were prepared through co-culturation method. Results showed that U(VI) sorption on kaolinite and illite in different pH ranges could be attributed to ion exchange, outer-sphere complexes (OSCs), and inner-sphere complexes (ISCs), while only the ISCs on the bio-composites. Moreover, micro-spectroscopy tests revealed that U(VI) coordinate with phosphate, amide, and carboxyl groups on illite- and kaolinite- A. niger composites. X-ray photoelectron spectroscopy (XPS) further found that U(VI) was partly reduced to non-crystalline U(IV) by A. niger in the bio-composites, occurring as phosphate coordination polymers or biomass-associated monomers. The findings herein provide further insight into the immobilization and migration of uranium in environments. [Display omitted] • Co-culture of A. niger did not change the structures of kaolinite and illite. • U(VI) sorption on kaolinite and illite depended on pH and/or ionic strength. • A. niger changed the sorption mechanism of U(VI) on kaolinite and illite. • U(VI) complexed with various functional groups on the bio-composites. • U(VI) was partly reduced by A. niger to noncrystalline U(IV). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00456535
- Volume :
- 288
- Database :
- Academic Search Index
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 153850974
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2021.132497