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Materials 2017, 10(12), 1364; https://doi.org/10.3390/ma10121364

Preparation of Al/Fe-Pillared Clays: Effect of the Starting Mineral

1
Grupo de Investigación en Materiales Funcionales y Catálisis (GIMFC), Departamento de Química, Universidad de Nariño, Calle 18, Cra. 50 Campus Torobajo, 520002 Pasto, Colombia
2
Departamento de Química, Universidad Nacional de Colombia, Ciudad Universitaria, Ctra. 30 # 45-03, 111321 Bogotá, Colombia
3
Departamento de Química Aplicada, Edificio de los Acebos, Universidad Pública de Navarra, Campus Arrosadia, 31006 Pamplona, Spain
4
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de la Merced, s/n, 37008 Salamanca, Spain
*
Author to whom correspondence should be addressed.
Received: 29 October 2017 / Revised: 20 November 2017 / Accepted: 27 November 2017 / Published: 28 November 2017
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Abstract

Four natural clays were modified with mixed polyoxocations of Al/Fe for evaluating the effect of the physicochemical properties of the starting materials (chemical composition, abundance of expandable clay phases, cationic exchange capacity and textural properties) on final physicochemical and catalytic properties of Al/Fe-PILCs. The aluminosilicate denoted C2 exhibited the highest potential as starting material in the preparation of Al/Fe-PILC catalysts, mainly due to its starting cationic exchange capacity (192 meq/100 g) and the dioctahedral nature of the smectite phase. These characteristics favored the intercalation of the mixed (Al13−x/Fex)7+ Keggin-type polyoxocations, stabilizing a basal spacing of 17.4 Å and high increase of the BET surface (194 m2/g), mainly represented in microporous content. According to H2-TPR analyses, catalytic performance of the incorporated Fe in the Catalytic Wet Peroxide Oxidation (CWPO) reaction strongly depends on the level of location in mixed Al/Fe pillars. Altogether, such physicochemical characteristics promoted high performance in CWPO catalytic degradation of methyl orange in aqueous medium at very mild reaction temperatures (25.0 ± 1.0 °C) and pressure (76 kPa), achieving TOC removal of 52% and 70% of azo-dye decolourization in only 75 min of reaction under very low concentration of clay catalyst (0.05 g/L). View Full-Text
Keywords: smectite; pillared clay; keggin-like mixed Al/Fe polyoxocation; mineralogical composition; catalytic wet peroxide oxidation smectite; pillared clay; keggin-like mixed Al/Fe polyoxocation; mineralogical composition; catalytic wet peroxide oxidation
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Muñoz, H.-J.; Blanco, C.; Gil, A.; Vicente, M.-Á.; Galeano, L.-A. Preparation of Al/Fe-Pillared Clays: Effect of the Starting Mineral. Materials 2017, 10, 1364.

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