Abstract
A leach resistant, stable strontium (Sr) specific solid phase ion exchange material that could be used as a matrix for immobilizing Sr-bearing nuclear waste was developed, and different studies were conducted to establish the material's stability. Sodium copper titanate (SCT) that was prepared by a simple solution synthesis method exhibited a high Sr removal tendency from pH 4 to 8, and is therefore capable of removing Sr from alkaline aqueous waste in the pH range. Sr adsorption was modeled using Langmuir, Freaundlich, Tempkin, and D-R isotherm models and the diffusion based reaction kinetics models have also been explored by modeling adsorption kinetics. Subsequent to Sr exchange to SCT at room temperature, the material was calcined at 673 K and 1273 K. Material stability of the Sr loaded SCT matrix was studied using thermogravimetric, SEM, X-ray diffraction and Raman spectrometric methods. Soxhlet leaching experiments were performed on the Sr-loaded SCT established the stability of the studied material under harsh conditions.
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