| 초록 |
Silica nanoparticles with narrow size distribution were synthesized from rice husk (RH). Further, porous silica structure was formed due to effects of potassium ions on silica. In experiments the preliminary leaching of raw RHs with diluted HCl was conducted, rinsed with water, then dried. The HCl-treated RHs were pyrolyzed, organic materials were decomposed and high purity silica was obtained. The silica powder was mixed with potassium chloride solution to introduce K+ into the silica structure. The filtered and dried samples were subsequently calcined. High purity (~99%) silica nanoparticles of 20-30 nm were synthesized from RHs. Under the controlled melting catalyzed by K+, such silica particles were fused and made porous structure with tunable pore size and structural integrity. This study suggests rice husks as an excellent source of amorphous silica. Moreover, by introducing K+ and tailoring calcination conditions, the silica nanoparticles can be converted to porous structures. |
