Rice husk (RH) biomass is a massive byproduct from rice milling. Applications of Rice husk have been very limited. Therefore, Rice husks are often considered as a bio-waste. Rice husks are mainly composed of lignocellulose (ca. 72−85 wt %) and silica (ca. 15−28 wt %). The majority of previous explorations focused on the preparation of silica or other silicon based materials from Rice husks, while the lignocellulose in Rice husks was usually burnt and thus wasted. Most of the lignocellulose in Rice husks was first extracted by dissolving in ionic liquids. Herein, an approach for comprehensive utilization of Rice husks has been developed to obtain both lignocellulose and high quality porous silica nanoparticles from Rice husks. The dissolved lignocellulose was subsequently separated and collected. The remaining Rice husk residue after extraction that contains a high concentration of silica was thermally treated to synthesize amorphous porous silica nanoparticles with a high purity and surface area. It was also found that, during the extraction of lignocellulose using ionic liquids, some metal cations (e.g., K+) that generate negative effect for the synthesis of silica can be removed simultaneously, which generates a synergy for this comprehensive
approach to make full use of Rice husk biomass. The implication of the present findings is discussed.
Rice husk (RH) biomass is a massive byproduct from rice milling. Applications of Rice husk have been very limited. Therefore, Rice husks are often considered as a bio-waste. Rice husks are mainly composed of lignocellulose (ca. 72−85 wt %) and silica (ca. 15−28 wt %). The majority of previous explorations focused on the preparation of silica or other silicon based materials from Rice husks, while the lignocellulose in Rice husks was usually burnt and thus wasted. Most of the lignocellulose in Rice husks was first extracted by dissolving in ionic liquids. Herein, an approach for comprehensive utilization of Rice husks has been developed to obtain both lignocellulose and high quality porous silica nanoparticles from Rice husks. The dissolved lignocellulose was subsequently separated and collected. The remaining Rice husk residue after extraction that contains a high concentration of silica was thermally treated to synthesize amorphous porous silica nanoparticles with a high purity and surface area. It was also found that, during the extraction of lignocellulose using ionic liquids, some metal cations (e.g., K+) that generate negative effect for the synthesis of silica can be removed simultaneously, which generates a synergy for this comprehensiveapproach to make full use of Rice husk biomass. The implication of the present findings is discussed.
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