Eco-fabrication of hierarchical porous silica monoliths by ice-templating of rice husk ash. Issue 1 (8th December 2016)

• Record Type: Journal Article
• Authors: Bahrami, Amin; Simon, Ulla; Soltani, Niloofar; Zavareh, Sara; Schmidt, Johannes; Pech-Canul, Martin I.; Gurlo, Aleksander
• Is Part Of: Green chemistry. Volume 19:Issue 1(2017)
• Page Start: 188
• Page End: 195
• Publication Date: 2016-12-08
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/c6gc02153k
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : In this study, within a sustainable chemistry approach, a clean and eco-friendly synthesis process of silica monoliths compatible with environmental limitations is developed. Abstract : In this study, within a sustainable chemistry approach, a clean and eco-friendly synthesis process of silica monoliths compatible with environmental limitations is developed. Rice husk (RH), a surplus agricultural byproduct, was used to engineer monoliths with a hierarchical pore structure. Amorphous and crystalline silica powders were extracted from rice husk and ice-templated using water as a liquid vehicle. The effect of silica crystallinity and silica content, as well as processing parameters such as the freezing rate and sintering temperature on the microstructural characteristics and mechanical properties of the obtained monoliths were investigated. Depending on the freezing regime, microstructural analysis confirmed the formation of macropores with lamellar or honeycomb-like structures. By varying the processing parameters, the pore size, wall thickness and porosity can be tailored. While monoliths from crystalline rice husk ash (CRHA) show higher mechanical strength, monoliths from amorphous rice husk ash (ARHA) possess a high specific surface area, demonstrating aligned nano-channels and non-uniform mesoporosity.