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Phosphate enhanced uranium stable immobilization on biochar supported nano zero valent iron.
- Source :
-
Journal of Hazardous Materials . Feb2022:Part B, Vol. 424, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- Uranium (U) immobilization from wastewater by zero valent iron (ZVI) was widely concerned through reduction and surface adsorption. Releasing of U due to re-oxidation of U(IV) into U(VI) limited the application of ZVI in U decontamination. In this work, a kind of biochar supported nano zero valent iron (Fe/BC(900)) was obtained by carbothermal reduction of starch mixed with ferric nitrate at 900 °C. U immobilization behavior by Fe/BC(900) in the presence of phosphate (P) was investigated. The U immobilization reaction was adjusted by controlling the sequence of U, Fe/BC(900) and P. U immobilization efficiency was enhanced to 99.9% in the presence of P. Reaction sequence of U, Fe/BC(900) and P influenced the U immobilization efficiency, which followed the order of (U-P)+Fe/BC(900)>(U- Fe/BC(900))+P>U+Fe/BC(900)>(P-Fe/BC(900))+U. P and nZVI both contributed to enhancing U immobilization through precipitation of uranyl-P and reductive co-precipitate (U(IV)) in a wide pH range. The released Fe ions could precipitate with uranyl and phosphate. Consumption of P and nZVI in the (P-Fe/BC(900))+U system limited U immobilization ability. The precipitate is highly dependent on U, P and Fe elements. U desorption in (U-P)+Fe/BC(900) system was not observed with stability. [Display omitted] • Enhanced immobilization of uranium by Fe/BC(900) in the presence of phosphate. • Reaction sequence of uranium, phosphate and Fe/BC(900) determined the uranium immobilization. • Consumption of nZVI by phosphate limited uranium immobilization. • Co-immobilization of uranium and phosphate on Fe/BC(900). • Uranium immobilization with neglected desorption in the presence of phosphate. [ABSTRACT FROM AUTHOR]
- Subjects :
- *URANIUM
*FERRIC nitrate
*BIOCHAR
*IRON
*URANIUM oxides
*PHOSPHATES
Subjects
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 424
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 153867599
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2021.127119