Preparation of aluminum sludge composite gel spheres and adsorption of U(IV) from aqueous solution.
Environ Sci Pollut Res Int
; 27(21): 26835-26844, 2020 Jul.
Article
em En
| MEDLINE
| ID: mdl-32382912
ABSTRACT
A novel three-dimensional aluminum sludge/polyvinyl alcohol/sodium alginate(AS/PA/SA) gel spheres were designed and prepared for uranium(VI) adsorption, and it overcomes the shortcomings of poor recycling of powdery aluminum sludge adsorbent and poor stability of sodium alginate. Experiments show that the P-S-AS has a good pH range for removal of uranium (4-5). Fitting experimental data with pseudo-first-order kinetic model and pseudo-second-order kinetic model shows that the adsorption of U(VI) by P-S-AS is a chemical action. The fit of the Langmuir isotherm model and Freundlich isotherm model to the experimental data found that the P-S-AS adsorbed U(VI) to a single layer. Thermodynamic analysis shows that the adsorption occurs spontaneously, and an increase in temperature is favorable for the adsorption of uranium by the P-S-AS. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis of the P-S-AS before and after adsorption showed that the main adsorption mechanism was the complexation reaction between functional groups and U(VI), the bonding reaction between metal oxides and U(VI).
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Urânio
/
Alumínio
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article