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Interlayered MnS Nanoclusters within a High-Charge Synthetic Sodium MICA (Na-2-MICA)

Ruiz, Lisette Y Pazos, Carolina Y Galeano, Luis-Alejandro (2015) Interlayered MnS Nanoclusters within a High-Charge Synthetic Sodium MICA (Na-2-MICA). In: XXIV International Materials Research Congress Cancún 2015, Agosto, Cancún.


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In this work a high charge swelling mica (Na-2-mica) with targeted composition Na2[Si6Al2]Mg6F4O20.XH2O was synthesized achieving high purity product by the sol-gel methodology, using methyltriethoxysilane (C7H18O3Si, 95 % purity) as silicon source. Development of interlayered MnS nanoclusters was achieved by Mn2+ cation exchange (Mn-mica) followed by H2S streaming (S2-/ Mn2+ ratio = 50) at room pressure and different temperatures of treatment (50, 100 or 150 °C). In addition, the effect of post- calcination step was also investigated at 200 °C or 400 °C under either, N2 or synthetic air atmosphere. XRD pattern of the Mn-mica showed shifted 001 reflections (d001 =1.385 nm and d001 =1.350 nm) to lower 2θ angle in comparison to the starting aluminosilicate (d001 =1.210 nm). The Mn2+-ion exchange achieved 17.4 % w/w of the metal incorporated in the Mn-mica, where the CEC of the Na-2-mica (270 meq/100g, dry basis) only decreased slightly upon Mn homoionization (CECMn-mica = 253 meq/100 g, dry basis). The XRD analyses showed that upon sulfidation at 50 °C, some of the clay layers stabilized at d001 = 1.353 nm, typical of the metal ion surrounded by a double layer of water molecules, and other fraction at d001 = 1.206 nm, typical of the metal ion surrounded by a water monolayer, whereas under 150 °C signals at 0.983 nm, attributed to anhydrous Na-2-mica, and 1.059 nm, probably related to the anhydrous Mn-mica, were found. Solid treated at 100 °C displayed a single signal d001 = 1.204 nm that could be ascribed to MnS interlayered nanoparticles, that splitted into two reflections (1.21 nm and 1.05 nm) upon thermal treatment at 200 °C in the presence of either inert (N2) or oxidizing atmosphere (air). Finally, upon treatment at 400 °C/N2 or air, signals corresponding to partial collapse and MnS interlayered nanoparticles (1.21 nm) were found.

Tipo de Elemento: Conferencia o Taller artículo (Poster)
Asunto: Q Ciencias > QD Chemistry
Division: Facultad de Ciencias Exactas y Naturales > Programa de Química > Productividad
Depósito de Usuario: PhD Luis Alejandro Galeano
Fecha Deposito: 07 May 2018 17:24
Ultima Modificación: 07 May 2018 17:24

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