One-Pot Preparation of Silica Fibers from Rice Straw for Efficiency Removal of Heavy Metal Ions

Abstract:

Silica fibers were prepared from the agricultural waste-rice straw via a slow calcination process. A possible formation mechanism of the obtained silica fiber was explained. The phytoliths/vascular composite fibers of rice straw work as the structural directing templates for the formation of silica fibers under the slow calcination process. Owing to the potassium silicate active site, the separable silica fiber showed great capability in removal of Cu²⁺, Ni²⁺, Cd²⁺ and Pb²⁺ from aqueous solution with efficiency higher than 99%. Additionally, over 90% of equilibrium adsorption capacity can be reached within 10 minutes, showing the easily accessible paths and active sites for ion transportation and adsorption in the as-prepared fiber. These results of this work are beneficial for scientists pursuing new synthetic route for valuable and widely applicable silica fiber materials from the agricultural waste, also helping to solve disposal of the agricultural waste and pollution problems.

• Periodical: Materials Science Forum (Volume 953)
• Pages: 191-197
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.953.191
• Online since: May 2019
• Authors: Shou Zhu Li, Ying Li, Kai Zhang, Li Yao*
• Keywords: Active Sites, Adsorption, Heavy Metal Ions, Rice Straw, Silica Fiber

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