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.