New heterogeneous synthesis of mixed Ti-Ca-Mg phosphates as efficient sorbents of 137Cs, 90Sr and 60Co radionuclides
| Autor: | Andrei Ivanets, Natalya Mudruk, Marina V. Maslova, I. L. Shashkova, N. V. Kitikova |
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| Rok vydání: | 2019 |
| Předmět: |
Aqueous solution
Magnesium Precipitation (chemistry) General Chemical Engineering Dolomite Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Phosphate 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Sulfate 0210 nano-technology Dissolution Titanium |
| Zdroj: | Journal of the Taiwan Institute of Chemical Engineers. 104:151-159 |
| ISSN: | 1876-1070 |
| Popis: | New heterogeneous synthesis of mixed Ti-Ca-Mg phosphates was developed and investigated using DTA-TG, XRD, FT-IR and SEM-EDX techniques. The route of synthesis is based on the heterogeneous interaction between aqueous solution of titanyl-diammonium sulfate and solid precursor as phosphated dolomite Ca0.7Mg0.3HPO4·2H2O (PD-1) and Ca2.65Mg3(NH4)1.3(PO4)4(CO3)0.3·6H2O (PD-2) composition. It has been shown that interaction of PD-1 with titanium solution is accompanied by successive dissolution of magnesium hydrogen phosphate and calcium hydrogen phosphate followed by titanium phosphate precipitation. For PD-2 solid precursor, the interaction proceeds by heterogeneous exchange reaction simultaneously with tertiary calcium, magnesium phosphates and magnesium-ammonium phosphate. It has been shown that when PD-1 is used, the final solid has surface area of 220–230 m2·g-1, total pore volume of 0.32–0.37 cm3·g−1 and average pore diameter of 5.7–6.7 nm. The solid obtained from PD-2 has lower surface properties such as 140–144 m2 g-1 for surface area and 0.27–0.34 cm3 g−1 for total pore volume. It has been shown that the samples of Ca-Mg-Ti phosphates effectively removed 137Cs, 90Sr and 60Co radionuclides at pH 5.0 (Kd 10−3–10−5 cm3 g−1) that could be used for one-stage purification of liquid radioactive wastes with complex radionuclide composition. |
| Databáze: | OpenAIRE |
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