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<p>This study aimed to evaluate the potential of agricultural waste, specifically rice husks (RH), as an adsorbent for organic substances in solution and to develop CO<sub>2</sub> reduction technologies through the synthesis of silica nanopowder. This confirmed its potential as an effective concrete adsorbent, showing higher organic substance adsorption rates with lower calcination temperatures of RHA (rice husk ash) and higher RHA weight in concrete. Silica nanoparticles with a purity of over 99% were synthesized using a Taylor-vortex reactor and an Erlenmeyer flask, where conditions for controlling particle size, such as synthesis temperature, and differences in standard deviation between reactors were identified. As part of a CO<sub>2</sub> capture and utilization strategy, the CO<sub>2</sub> absorption capacity during the synthesis process of RHA silica nanopowder was evaluated. The strong stirring intensity of the Taylor-vortex reactor improved the mass transfer rate, resulting in the production of silica nanoparticles with relatively uniform particle size and proved advantageous for CO<sub>2</sub> absorption. Utilization strategy for RHA silica nanoparticles, medical hydro-colloid bands were fabricated by the addition of RHA silica nanoparticles, achieving an absorption rate of over 200%. This study integrates green chemistry and nanotechnology, promoting environmental and economic sustainability through the advanced utilization of agricultural products, with promising implications for materials innovation and CO<sub>2</sub> utilization.</p>

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Applications of Rice Husk for Adsorption of Organic Contaminant and Synthesis of Silica Nanopowder Using CO2 as Reactant

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Jae-Hun Chung,
  • Quach Van Thanh,
  • Young-Sang Cho

摘要

This study aimed to evaluate the potential of agricultural waste, specifically rice husks (RH), as an adsorbent for organic substances in solution and to develop CO2 reduction technologies through the synthesis of silica nanopowder. This confirmed its potential as an effective concrete adsorbent, showing higher organic substance adsorption rates with lower calcination temperatures of RHA (rice husk ash) and higher RHA weight in concrete. Silica nanoparticles with a purity of over 99% were synthesized using a Taylor-vortex reactor and an Erlenmeyer flask, where conditions for controlling particle size, such as synthesis temperature, and differences in standard deviation between reactors were identified. As part of a CO2 capture and utilization strategy, the CO2 absorption capacity during the synthesis process of RHA silica nanopowder was evaluated. The strong stirring intensity of the Taylor-vortex reactor improved the mass transfer rate, resulting in the production of silica nanoparticles with relatively uniform particle size and proved advantageous for CO2 absorption. Utilization strategy for RHA silica nanoparticles, medical hydro-colloid bands were fabricated by the addition of RHA silica nanoparticles, achieving an absorption rate of over 200%. This study integrates green chemistry and nanotechnology, promoting environmental and economic sustainability through the advanced utilization of agricultural products, with promising implications for materials innovation and CO2 utilization.