Synthesis temperature effect on Na-Mica-4 crystallinity and heteroatom distribution

Abstract

ABSTRACT:The discovery of swelling brittle mica, Na-Mica-4, has been one of the most 11 significant advances in the pursuit for a material with high ion-exchange capacity. For 12 technical applications, the control of the phase evolution during the synthesis is crucial. The 13 main aim of this study was to investigate the effect of Na-Mica-4 synthesis temperature on 14 the crystalline phase evolution, Si-Al distribution in the tetrahedral sheet, the Al occupancy 15 between tetrahedral and octahedral sites and their effects on the interlayer space composi-16 tion. The synthesis temperature range between 600 ºC and 900 ºC was explored. At low 17 temperature (600 ºC), the precursors were transformed in a low-charged swelling 2:1 phyl-18

Design swelling micas: Insights on heavy metals cation exchange reaction

“…3) are characterized by a broad signal between 10 and -30 ppm due to exchangeable hydrated cation and, in the case of Na-M2, an additional peak at ca. 37 ppm due to non-exchangeable Na + is also observed (Naranjo et al, 2015). After the metal exchange reaction, the intensity of the exchangeable Na + signal decreases in good agreement with the quantity of remainder sodium after the exchange reaction (Fig.…”

Pb2+, Cd2+ and Hg2+ removal by designed functionalized swelling high-charged micas

“…30 ppm attributed to non-exchangeable sodium, and, iii) a signal at ca. 5 ppm due to sodium in sodalite (Naranjo et al, 2015).…”

A comprehensive and in-depth analysis of the synthesis of advanced adsorbent materials

“…X-ray diffractograms of the samples of series A (Fig. 1) showed patterns that corresponded to Na-Mica-4 (Naranjo et al, 2015) with a unique 001 reflection corresponding to a basal space of 12.1 Å due to hydrated Na + (Alba et al, 2011). Additionally, in the XRD pattern of the sample A1, Al and Mg deficient starting mixture, small reflections of sodalite were observed.…”

“…The effect of temperature and time were not analysed because they were already evaluated, 900 ºC during 15 h being the optimal conditions in Pt crucibles. (Alba et al, 2011;Naranjo et al, 2015) The comparison of samples A2, E1 and E3 allowed the determination of the influence of the crucible material on synthesis products. The XRD patterns of the three samples were compatible with the presence of hydrated mica (Fig.…”

“…For the technical applications of those synthetic micas, feasible and economical scalable synthesis methods should be investigated. Moreover, an effective control of each synthesis step is crucial for an optimization of the synthesis parameters (Kloprogge et al, 1999;Zhang et al, 2010) such as chemical precursors (Gregorkiewitz and Rausellcolom, 1987;Kodama and Komarneni, 1999;Paulus et al, 1992), time (Alba et al, 2011) and temperature of reaction (Naranjo et al, 2015). Synthesis procedure of clays has been refined and different starting materials were tested to achieve a cost efficient production (Gregorkiewitz and Rausellcolom, 1987;Kodama and Komarneni, 1999;Naranjo et al, 2014;Park et al, 2002a;Paulus et al, 1992).…”