Zirconium decontamination from aqueous media using lateritic minerals
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Abstract
The sorption behavior of zirconium on minerals from a lateritic weathering has been carried out to evaluate its potential for the decontamination of zirconium ions from aqueous solutions. Various physico-chemical parameters such as selection of appropriate electrolyte, equilibration time, amount of adsorbent, concentration of adsorbate, effect of diverse ions and temperature were studied in order to simulate the best conditions under which this material can be used as an adsorbent, employing batch method and radiotracer technique. Maximum adsorption was observed at 0.005 mol L−1 acid solutions (HNO3, HCl, H2SO4 and HClO4) using 0.3 g of adsorbent for 1.499×10−4 mol L−1 zirconium concentration in five minutes equilibration time. Studies show that the adsorption of zirconium decreases with the increase in the concentrations of all the acids. The adsorption data follows the Freundlich isotherm over the range of 7.5×10−5 to 3.0×10−3 mol L−1 zirconium concentration. The characteristic Freundlich constants i.e. 1/n = 0.55±0.03 and K=1.36×10−3±7.0×10−5 mol g−1 have been computed for the sorption system. The sorption mean free energy from the Dubinin–Radushkevich isotherm is 11.2±0.4 kJ mol−1 indicating ion-exchange mechanism of chemisorption. The uptake of zirconium increases with the rise in temperature (283-323 K). Thermodynamic quantities i.e. ΔG, ΔS and ΔH have also been calculated for the system. The sorption process was found endothermic.
© Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Theoretical investigations of the reactivity of MO4 and the electronic structure of Na2[MO4(OH)2], where M=Ru, Os, and Hs (element 108)
- Production of 234,235Np and 236Pu in bombardment of 236U with protons in the energy range from 17 to 40 MeV
- Cross-section measurements for (n, 2n) and (n, p) reactions on platinum isotopes in the neutron energy range of 13.5 to 14.6 MeV
- Sorption of U(VI) species on hydroxyapatite
- Synthesis and characterization of sodium meta-autunite, Na[UO2PO4]·3H2O
- The solubility product of NaUO2PO4·xH2O determined in phosphate and carbonate solutions
- Speciation of technetium(IV) chloride under gamma irradiation
- Synthesis and biodistribution of 99mTc-Vancomycin in a model of bacterial infection
- Prospects and problems in the production of 143Pr for radionuclide therapy applications
- Zirconium decontamination from aqueous media using lateritic minerals
