Synthesis of mesoporous silica using a mineral silica source

Tillman, Langston; Voskanyan, Albert; Navrotsky, Alexandra

doi:10.1111/jace.18867

Synthesis of mesoporous silica using a mineral silica source

Journal Article · Wed Nov 23 04:00:00 EST 2022 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.18867· OSTI ID:2419476

Tillman, Langston ^[1]; Voskanyan, Albert ^[2]; ^[3]

School of Engineering of Materials, Transport, and Energy Arizona State University Tempe Arizona USA; OSTI
School of Molecular Sciences and Center for Materials of the Universe Arizona State University Tempe Arizona USA
School of Engineering of Materials, Transport, and Energy Arizona State University Tempe Arizona USA; School of Molecular Sciences and Center for Materials of the Universe Arizona State University Tempe Arizona USA

Abstract

Mesoporous silica has been applied in catalysis, separations, and drug delivery. It has generally been made using organosilicon precursors such as tetraethyl orthosilicate. For sustainability, it is necessary to find readily accessible mineral sources for making mesoporous silica. In this work, we demonstrate the successful synthesis of mesoporous silica with 10 nm average pore size using the mineral forsterite (Mg₂SiO₄) as a silica source, providing a potentially cheaper and more Earth‐friendly route to making technologically important porous silica materials. Pure forsterite was synthesized by a solid‐state chemistry route at 1000°C and underwent dissolution–reprecipitation in aqueous hydrochloric acid containing the soft template surfactant, Pluronic P123. Variations of initial reaction pH (−0.2 to 0.6), reaction time (12–24 h), reaction temperature (50 to 90°C), and silica precursor (forsterite and fumed silica) were performed. The mesoporous silica aged at 70°C for 24 h had the highest porosity, with a surface area of 735 m²/g and a pore volume of 1.4 ml/g, comparable to mesoporous silica made using conventional starting materials. This novel geomimetic synthesis route supports the possibility of analogous formation of structured (mesoporous or zeolitic) silica in nature under abiotic or prebiotic conditions.

Research Organization:: Univ. of California, Davis, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-97ER14749

OSTI ID:: 2419476

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 106; ISSN 0002-7820

Publisher:: American Ceramic Society

Country of Publication:: United States

Language:: English

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