Kinetics and adsorption equilibrium of some radionuclides on polyaniline/SiO2 composite
| Autor: | Abeer E. Kasem, Ezzat A. Abdel-Galil, Nagwa A. Badawy, Nabil Belacy |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Radionuclide
Chemistry Composite number Kinetics Adsorption equilibrium 010501 environmental sciences 010403 inorganic & nuclear chemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Chemical engineering Polyaniline Physical and Theoretical Chemistry 0105 earth and related environmental sciences |
| Zdroj: | Radiochimica Acta. 109:85-97 |
| ISSN: | 2193-3405 0033-8230 |
| DOI: | 10.1515/ract-2020-0014 |
| Popis: | The sorption kinetics and equilibrium isotherms of zirconium, uranium, and molybdenum ions onto synthetic polyaniline/SiO2 composite (PAn/SiO2) have been studied using batch-sorption techniques. This study was carried out to examine the sorption behavior of the PAn/SiO2 for the removal of Zr(IV), U(VI), and Mo(VI) ions from an aqueous solution. The influence of some parameters on the sorption process was also studied. The maximum sorption for Zr(IV), U(VI), and Mo(VI) ions was achieved at 60 min shaking time. Langmuir isotherm model is the most representative for discussing the sorption process with a maximum sorption capacity of 24.26, 21.82, and 13.01 mg/g for Zr(IV), U(VI), and Mo(VI) ions, respectively. Kinetic modeling revealed that the sorption of all ions follows the pseudo-second-order kinetic model. The results demonstrated that both the external and intra-particular diffusion are taken into account in determining the sorption rate. Thermodynamic parameters like ΔG°, ΔH°, and ΔS° for the sorption process were evaluated. The synthetic composite has been successfully applied for the removal and recovery of U(VI) ions from real solution (monazite leachate) using a chromatographic column packed with PAn/SiO2 composite with a breakthrough capacity equal to 239.70 mg/g. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|