A study on the preparation of nano particle of silica from rice husk ash by Precipitation Method

Rice husk ash (RHA) is an abundant agricultural by-product. This work presented a laboratory studies on the preparation of rice husk ash by burning at 800 oC for 4 h. silica content obtained after heat treatment at 700 oC for 6 h was with high efficiency. Rice husk ash (RHA) was purified by alkaline extraction method used different concentration Potassium hydroxide. Percent yield of silica extracted by 2.5 M KOH, was 95% and the infrared spectral data supported the presence of hydrogen bonded silinol group and the siloxane groups in the silica. Subsequently, the RHA was subjected to precipitation method in order to produce nanosilica. The precipitation was done by refluxing silica from RHA in boiling 2.5 M KOH, respectively. TEM results showed that 2.5 M KOH provided agglomerate particles with dimension arround 10nm in .

کلیدواژه ها:

Rice husk ash ، Nanosilica ، Consecutive preparation ، TEM