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Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

Institute for Sorption and Problems of Endoecology NAS of Ukraine, Gen. Naumov str., 13, 03164 Kiev, Ukraine
Colloids Interfaces 2019, 3(1), 36; https://doi.org/10.3390/colloids3010036
Received: 27 December 2018 / Revised: 24 February 2019 / Accepted: 1 March 2019 / Published: 12 March 2019
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Abstract

The aim of the work was the development of cheap and effective adsorbents based on titanium silicates deposited on the products of thermochemical processing of rice husk to extract cesium and strontium radioisotopes from aqueous media. Synthesis of adsorbents was carried out using the cheapest and widely used titanium water-soluble reagent, titanium sulfate (an intermediate product of white rutile pigment production), as feedstock. After treatment with titanium sulfate and neutralization, hydrothermal treatment was carried out in various ways. The traditional method of processing in an autoclave was used, as well as the blowing at different temperatures by steam. The distribution coefficients and the adsorption capacity for cesium and strontium ions on these sorbents were studied. Along with the chemical composition of adsorbents obtained by those ways, the type and the temperature of hydrothermal treatment also affected the adsorption properties. It was found that the adsorbent obtained by hydrothermal treatment in an autoclave has the highest degree of cesium ions extraction (Kd = 27,500). The highest degree of strontium ions extraction (Kd = 2,095,000) has an adsorbent obtained by hydrothermal treatment with water vapor blowing. View Full-Text
Keywords: hydrated titanium silicates; cesium; strontium; ion-exchangers; rice husk biochar; radioisotope extraction hydrated titanium silicates; cesium; strontium; ion-exchangers; rice husk biochar; radioisotope extraction
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Zhuravlev, I. Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions. Colloids Interfaces 2019, 3, 36.

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