Bulk synthesis and selective exchange of strontium ions in Na4Mg6Al4Si4O20F4 mica

A new route of synthesis of Na-Mica-4 from sodalite

“…These methods 13 sought: i) products free from impurities, and, ii) cheaper silicon sources. Paulus et al 14 [4] made a big step forward using a sol-gel route with Mg(NO 3 ), Al(NO 3 ) 3 and TEOS, 15 subsequent mixture with NaF and calcination, obtaining a product with particle sizes in 16 the range 1 m-5m, showing selectivity towards retention of radionuclides such as 17 different coordination number [9]. In this case, Al was not in tetrahedral coordinated in 1 the precursor, which can be an important factor for cation distribution in the synthesized 2 product.…”

Cesium and Strontium Separation Technologies Literature Review

“…Synthetic mica was used to remove strontium [6]. Both of these rather non-selective technologies were developed to utilize the sorbent in the final waste formulation.…”

“…Small-scale (1 cc) column tests with simulated JAERI Tokai-Mura site waste were performed [13]. The use of potassium, nickel hexacyanoferrate (KNiFe(CN) 6 ) for cesium removal over a pH range of 1-10 has also been reported [14]. Numerous cyanoferrates with Cu, Co, Ni and Zn transition metals in polyacrylonitrile (PAN) matricies for the removal of cesium have been developed and tested [15].…”

Thermal transformation and ionic conductivity of ammonium ion-exchanger prepared from Na-4-mica

“…So if micas have cations with smaller size in the interlayer and/or have many cations in the interlayer like Na-4-mica, they will have a possibility as ionic conductors. Na + ions in the interlayer of Na-4-mica can be exchanged for other kinds of cations [1][2][3][4][5][6][7][8][9][10]. So we thought that it would be easy to fabricate proton, lithium ion or other cations conducting micas by the ion exchange of Na-4-mica.…”

“…It has theoretically high ion-exchange capacity and its cation exchange properties have been investigated [1][2][3][4][5][6][7][8][9][10].…”