Impregnation of Fe3+ into MCM-41 Pores: Effect of Fe3+ Concentration on the Weight Percent of Fe-Frameworks and Fe-Non-Frameworks

Suyanta, Suyanta and Kuncaka, Agus and Mudasir, Mudasir (2023) Impregnation of Fe3+ into MCM-41 Pores: Effect of Fe3+ Concentration on the Weight Percent of Fe-Frameworks and Fe-Non-Frameworks. Indonesian Journal of Chemistry, 23 (4). pp. 984-996. ISSN 14119420

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28. Impregnation-of-Fesup3sup-into-MCM41-Pores-Effect-of-Fesup3sup-Concentration-on-the-Weight-Percent-of-FeFrameworks-and-FeNonFrameworksIndonesian-Journal-of-Chemistry.pdf - Published Version
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Abstract

Silica from rice husks (RH) has been used as a starting ingredient in the sonication synthesis of MCM-41 (RH-MCM-41). The impregnation of Fe3+ into RHMCM-41 pores to produce RH-MCM-41 containing Fe2O3 and Fe (denoted as Fe2O3-FeRH-MCM-41) was carried out by examining the effect of various Fe3+ concentrations on the weight percent of Fe-frameworks (Fe3+ that replaces Si4+ in silicate frameworks) and Fe-non-frameworks, i.e., the iron oxide formed outside the silicate frameworks. Fe2O3-FeRH-MCM-41 was washed with a 0.01 M HCl solution to remove Fe-non-frameworks from the materials and give Fe-RH-MCM-41 containing Fe-frameworks. The Fe content in Fe2O3-Fe-RH-MCM-41 (Fe-total) and Fe-RH-MCM-41 (Fe-frameworks) for each sample was determined by an AAS (atomic absorption spectrometer), whereas the content of Fe-non-frameworks was calculated from the difference between Fe-total and Feframeworks. The XRD (X-ray diffraction) pattern, N2 adsorption-desorption isotherm profile, as well as the TEM (transmission electron microscope) image clearly demonstrate that the RH-MCM-41 exhibits an ordered p6mm hexagonal mesostructure with a large specific surface area and uniform pore size. Based on the weight percents of Fe-frameworks found in each sample, it is clear that the content of Fe-non-frameworks is significantly enhanced compared to that of Fe-frameworks when the more concentrated Fe3+ is used.

Item Type: Article
Uncontrolled Keywords: Fe-frameworks; Fe-non-frameworks; impregnation; RH-MCM-41
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Mathematics and Natural Sciences > Chemistry Department
Depositing User: Ismu WIDARTO
Date Deposited: 05 Sep 2024 08:04
Last Modified: 05 Sep 2024 08:04
URI: https://ir.lib.ugm.ac.id/id/eprint/6459

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