This work presented a laboratory studies on the preparation of rice husk ash by
burning at 700 o
C for 3 and 6 h, respectively. Consequently, silica content obtained after heat
treatment at 700 o
C for 6 h was 98.14%. Rice husk ash (RHA) was purified by alkaline extraction
method used 2.0, 2.5 and 3.0 N sodium hydroxide. Percent yield of silica extracted by 2.5 N.
NaOH, was 90.3% and the infrared spectral data supported the presence of hydrogen bonded
silinol group and the siloxane groups in 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 2.0, 2.5 and 3.0 N NaOH, respectively. TEM results showed that
2.5 N NaOH for 10 h provided agglomerate particles with dimension of 5-10. The specific
surface area was found to be 656 m2
/g. From X-ray diffractograms and diffraction pattern
showed that the obtained products were amorphous nanosilica
This work presented a laboratory studies on the preparation of rice husk ash byburning at 700 oC for 3 and 6 h, respectively. Consequently, silica content obtained after heattreatment at 700 oC for 6 h was 98.14%. Rice husk ash (RHA) was purified by alkaline extractionmethod used 2.0, 2.5 and 3.0 N sodium hydroxide. Percent yield of silica extracted by 2.5 N.NaOH, was 90.3% and the infrared spectral data supported the presence of hydrogen bondedsilinol group and the siloxane groups in silica. Subsequently, the RHA was subjected toprecipitation method in order to produce nanosilica. The precipitation was done by refluxingsilica from RHA in boiling 2.0, 2.5 and 3.0 N NaOH, respectively. TEM results showed that2.5 N NaOH for 10 h provided agglomerate particles with dimension of 5-10. The specificsurface area was found to be 656 m2/g. From X-ray diffractograms and diffraction patternshowed that the obtained products were amorphous nanosilica
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