Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam
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Muhammad M. Saeed
Summary
The sorption of uranium(VI) ions onto PAN loaded PUF has been investigated. Quantitative sorption of uranium(VI) onto PAN loaded PUF was achieved after 30 minutes equilibration time from pH 7 buffer solution. The sorption data followed Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherms. Langmuir parameters Q = 45.3 ± 0.2 μmol g−1 and b = (76.2 ± 0.2) × 103 dm3 mol−1, Freundlich constants 1/n = 0.21 ± 0.01 and KF = 229 ± 21 μmol g−1 and D–R parameters β = −0.0015 ± 0.00005 kJ2 mol−2, Xm = 72.23 ± 3.11 μmol g−1 and E = 18.3 ± 0.3 kJ mol-1 have been evaluated. The variation of sorption data with temperature gives ΔH = 176 ± 5 kJ mol−1, ΔS = 626 ± 17 J mol−1K−1 and ΔG = −10.6 ± 0.7 kJ mol−1 at 298 K. The positive value of enthalpy (ΔH) and negative value of free energy (ΔG) show endothermic and spontaneous nature of sorption respectively. A number of solvents were tested to elute the uranium-PAN complex from the PAN loaded PUF, only amine solvents and cyclohexanone have the capability to desorb the complex. The sorption mechanism has been discussed.
© by Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
- Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched 112Sn targets with reference to 111In production via radioisotope generator 112Sn(n, 2n)111Sn → 111In
- Study on some physical chemistry aspects of extraction of uranium(VI) with bis(octylsulfinyl)methane
- Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam
- Sorption of trivalent plutonium onto UO2 and the effect of the solid phase on the Pu oxidation state
- Solubility of uranium(IV) hydrous oxide in high pH solution under reducing condition
- Recovery of minor actinides from HLLW using the DIAMEX process
- Towards a DIAMEX process using high active concentrate. Production of genuine solutions
- The mobility of anthropogenic 129I in a shallow sand aquifer at Sturgeon Falls, Ontario, Canada
