Sorption studies of yttrium(III) ions on surfaces of nano-thorium(IV) oxide and nano-zirconium( IV) oxide
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Sorption of yttrium on nano-thorium oxide and zirconium oxide was carried out as a function of pH, contact time, concentration, temperature and co-ions. The effect of initial yttrium ion concentration has been investigated in the range of 0.5–50 ppm for 1.0 mg of sorbent dosages. Maximum sorption of 10.5 mg/g in case of nano-thorium oxide and 18.0 mg/g in case of nano-zirconium oxide was noticed from the solution of initial metal ion concentration 0.5 ppm, temperature of 298 K, pH 6.9, shaking time of 120 min (nano-thorium oxide) and contact time of 50 min (nano-zirconium oxide) for the yttrium ion sorption. Sorption followed both Dubinin–Radushkevich and Langmuir isotherms. The free energy of sorption was found to be 8.77 kJ/mol (yttrium(III) vs nano-thorium dioxide) and 18.4 kJ/mol (yttrium(III) vs nano-zirconium oxide) using Dubinin–Radushkevich isotherm. Sorption increased with increase in temperature in the studied temperature range. Sorption was endothermic. And the values of ∆H°, ∆S° and ∆G° were also evaluated. Pseudo-second-order equation fitted for the sorption kinetics. Reichenberg equation was used to explain the diffusion process. The effects of co-ions on sorptions were also investigated. BET surface areas of sorbent particles were 33 m2/g for nano-zirconium oxide and 25 m2/g for nano-thorium oxide. X-ray diffraction and high-resolution transmission electron microscopy data revealed that the size of the sorbent particles was 4.7 and 15.5 nm for nano-thorium dioxide and nano-zirconium dioxide, respectively.
KeywordsYttrium Isotherm Kinetic model Thermodynamic parameters
The authors would like to thank the Head of Department of Chemistry, GITAM University, Andhra Pradesh, India, for providing necessary laboratory facilities and UGC MRP Grant (MRP-MAJOR-CHEM-2013-15298) (F. No.: 43-185/2014-(SR)) dated: 13.02.2016 for funding to carry out the present work. The authors are grateful to Banaras Hindu University for XRD characterization, STIC, Cochin University for HR-TEM, SAIF, IIT Bombay for ICP-AES and IIT Kanpur for BET surface area analyser.
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