Investigation of thorium adsorption from aqueous solutions by XAD-7 resin impregnated with a mixture of phosphate compounds in a batch system
Subject Areas : Chemical Engineering (Environmental Pollution)Keywords: Adsorption, Isotherm model, Thorium separation, XAD-7, Impregnation, Phosphate compounds,
Abstract :
It is necessary to separate and determine the exact amount of thorium in nuclear wastes due to its high toxicity. In this study, thorium ions were adsorbed in a batch system by Amberlite XAD-7 ion exchange resin impregnated with phosphate compounds such as TOPO (tri-octylphosphine oxide) and T2EHP (tri-2-ethylhexyl phosphate). The effect of important and effective parameters on the adsorption process such as pH, time, temperature and the presence of interfering ions, as well as the effect of appropriate detergent on desorption, was investigated and evaluated. Thermodynamic relationships and several isothermal adsorption models including Freundlich, Redlich-Peterson, Langmuir and Temkin were investigated to describe the adsorption equilibrium. Inductively Coupled Plasma (ICP) was used to determine the amount of thorium adsorption. The structure of the modified adsorbent was investigated by infrared (IR) spectroscopy and thermal gravimetric analysis (TGA) methods. Based on the results obtained from the tests of thorium adsorption on XAD-7 resins impregnated with phosphate compounds, it was concluded that the adsorption reaction is a spontaneous (negative Gibbs free energy changes) and an exothermic process (negative enthalpy changes). Among the isothermal adsorption models, the nonlinear Redlich-Peterson model had the best result at 35 °C.
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