Abstract
Third generation poly(amido)amine (PAMAM) dendron was grown on the surface of styrene divinylbenzene (SDB) by divergent polymerization method. This new chelating resin (PAMAMG3-SDB) has been investigated in liquid–solid extraction of thorium. The effects of analytical parameters such as pH, contact time, concentration of thorium, resin dose and temperature on adsorption were investigated. Kinetic and isotherm studies of the adsorption were also carried out to understand the nature of adsorption of thorium on the chelating resin. Kinetic data followed a pseudo-second-order model and equilibrium data were best fitted with Langmuir model. The maximum adsorption capacity of thorium ions was determined to be 36.2 mg g−1 at 298 K. Thermodynamic parameters such as standard enthalpy, entropy, and free energy of adsorption of thorium on PAMAMG3-SDB were calculated as −10.498 kJ mol−1, 0.0493 kJ mol−1 K−1 and −25.208 kJ mol−1 respectively at 298 K from temperature dependent equilibrium data.
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Acknowledgments
The authors sincerely thank Shri S. C. Chetal, Director, IGCAR for his constant encouragement. The authors thank Shri H. Krishnan, Shri B.N. Mohanty and Shri Shailesh Joshi, RSD, IGCAR for their help during the experiments.
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Ilaiyaraja, P., Deb, A.K.S., Sivasubramanian, K. et al. Removal of thorium from aqueous solution by adsorption using PAMAM dendron-functionalized styrene divinyl benzene. J Radioanal Nucl Chem 297, 59–69 (2013). https://doi.org/10.1007/s10967-012-2402-x
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DOI: https://doi.org/10.1007/s10967-012-2402-x