Issue 24, 2021

Eco-friendly and facile synthesis of size-controlled spherical silica particles from rice husk

Abstract

The valorization of inorganic silica components from rice husk has been considered an important research topic over the last few decades. However, owing to various problems, such as the difficulty in controlling precise morphological properties, complex extraction and manufacturing processes, and the use of hazardous acids, the technology for producing high value-added silica for industrial applications is still insufficient. In this study, we developed a method for obtaining size-controlled spherical silica from rice husk using an eco-friendly and simplified process that overcomes the above-mentioned limitations. Silica particles were obtained by extraction from rice husk in alkaline media under mild conditions (80 °C) followed by pH adjustment with acetic acid. Therefore, the use of strong acids was excluded, no special equipment was required for the process, and the overall synthetic process was significantly simplified. The silica particles obtained through this method were uniformly spherical in shape, with a surface area of more than 200 m2 g−1. Our results indicate that the preparation of silicate solution under appropriate conditions and the use of polyethylene glycol (PEG) additives during the precipitation step are important for obtaining spherical silica. Moreover, by adjusting the temperature in the precipitation step, the size of the spherical silica particles can be controlled in the range of ∼250 nm to ∼1.4 μm. Our study contributes to the development of rice husk-derived silica that can be applied to practical industrial applications.

Graphical abstract: Eco-friendly and facile synthesis of size-controlled spherical silica particles from rice husk

Supplementary files

Article information

Article type
Paper
Submitted
07 Sep 2021
Accepted
07 Oct 2021
First published
08 Oct 2021
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2021,3, 6965-6973

Eco-friendly and facile synthesis of size-controlled spherical silica particles from rice husk

S. Kim, J. Y. Park, Y. M. Gu, I. Jang, H. Park, K. K. Oh, J. H. Lee and J. Chun, Nanoscale Adv., 2021, 3, 6965 DOI: 10.1039/D1NA00668A

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