Abstract
This work studies the adsorption of zirconium ions by mesoporous titanium dioxide and by sodium-modified mesoporous titanium dioxide. Experimental maximal adsorption values of zirconium ions by H-TiO2 and Na-TiO2 were found to be 64 mg/g and 109,5 mg/g respectively. This process depends on the interaction time, equilibrium concentration of zirconium ions and acidity of the solution. Adsorption kinetics fit well into the diffusion kinetic model and indicate a several stages of zirconium ions adsorption. Equilibrium adsorption of zirconium ions is well described by the Langmuir's adsorption theory for both adsorbents. The results obtained by inductively coupled plasma mass spectrometry showed that the investigated adsorbent selectively adsorb zirconium ions from the mixture with strontium and yttrium ions in the range of solution pH = 0-1. The percentage of maximum extraction of zirconium ions is 86,61% for H-TiO2 and 94,11% for Na-TiO2. This fact is extremely valuable for nuclear forensics or for the determination of 90Sr in low activity background samples.
Highlights
The relevance of studies of the adsorption of zirconium ions from aqueous solutions and its selective separation from strontium and yttrium can be explained by multiple factors
This work will study the adsorption of zirconium ions by H-TiO2 and Na-TiO2, as well as the possibility of separation of 90Sr and 90Zr isotopes by investigated adsorbents for subsequent analysis using inductively coupled plasma mass spectrometry
The study of the possibility of strontium, yttrium, and zirconium ions separation using the investigated adsorbents was performed under batch conditions
Summary
The relevance of studies of the adsorption of zirconium ions from aqueous solutions and its selective separation from strontium and yttrium can be explained by multiple factors. The accuracy of the oxalate technique is not very high and does not allow determining 90Sr in low-level environmental samples In this case, inductively coupled plasma mass spectrometry (ICP-MS) may be the only method of 90Sr analysis. This work will study the adsorption of zirconium ions by H-TiO2 and Na-TiO2, as well as the possibility of separation of 90Sr and 90Zr isotopes by investigated adsorbents for subsequent analysis using inductively coupled plasma mass spectrometry. The uniqueness of the properties of adsorbents based on mesoporous TiO2 is due to the developed surface area and a large number of adsorption centers on it in combination with the predominantly crystalline structure of TiO2 These adsorbents are resistant to aggressive environments and thermally stable. The introduction of sodium cations into the structure of mesoporous TiO2 leads to functional
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