| Autor: |
Perovskiy IA; Institute of Geology of Komi Science Centre of Ural Branch of the Russian Academy of Sciences, 167000 Syktyvkar, Russia.; Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana Str. 14, 184209 Apatity, Russia., Shushkov DA; Institute of Geology of Komi Science Centre of Ural Branch of the Russian Academy of Sciences, 167000 Syktyvkar, Russia., Ponaryadov AV; Institute of Geology of Komi Science Centre of Ural Branch of the Russian Academy of Sciences, 167000 Syktyvkar, Russia., Kalashnikova GO; Laboratory for Synthesis and Research of the Properties of Mineral-like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana Str. 14, 184209 Apatity, Russia., Bazai AV; Laboratory for Synthesis and Research of the Properties of Mineral-like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana Str. 14, 184209 Apatity, Russia., Bocharov VN; Saint-Petersburg State University, Universitetskaya Emb., 7/9, 199034 St. Petersburg, Russia., Panikorovskii TL; Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana Str. 14, 184209 Apatity, Russia. |
| Abstrakt: |
A simple method for the direct transformation of Sr-exchanged titanosilicate with the sitinakite structure (IONSIV) into ceramic material through cold pressing and subsequent sintering at 1100 °C for 4 h is presented. The temperature transformation of Sr-exchanged sitinakite showed the stages of recrystallization of the material with the formation of Sr-Ti phases matsubaraite (Sr 4 Ti 5 [Si 2 O 7 ] 2 O 8 ), jeppeite (SrTi 6 O 13 ), tausonite (SrTiO 3 ), and rutile. Leaching experiments showed the efficiency of fixation of Sr cations in a ceramic matrix; extraction into water does not exceed 0.01% and desorption in 1 M HNO 3 solution is only 0.19% within three days. The leaching rates of immobilized Sr demonstrate the structural integrity of the formed phases in the ceramic (2.8 × 10 -5 -1.0 × 10 -5 g/(m 2 ·day). The decrease in the crystallinity of the initial Na-sitinakite, which is achieved by reducing the synthesis temperature from 250 to 210 °C, does not affect the sorption capacity and the fixation of cations in the ceramic matrix. The obtained results confirm the prospect of using inexpensive precursors, titanium ore enrichment waste, for the synthesis of sorption materials. |
