A novel two-staged thermal synthesis method of generating nanosilica from rice husk via pre-pyrolysis combined with calcination
2014; Elsevier BV; Volume: 65; Linguagem: Inglês
10.1016/j.indcrop.2014.11.045
ISSN1872-633X
AutoresShan Gu, Jinsong Zhou, Chunjiang Yu, Zhongyang Luo, Qinhui Wang, Zhenglun Shi,
Tópico(s)Clay minerals and soil interactions
ResumoRice husk is a promising precursor for producing amorphous nanosilica particles. Nanosilica particles with controllable surface areas and pore volumes have been obtained from rice husk using a novel two-staged thermal method via pre-pyrolysis combined with calcination. Nanosilica particles of different levels of purity and textural properties were produced under CO2 and N2 pyrolysis atmosphere within the temperature range of 300–800 °C. The materials synthesized at the designated pyrolysis temperature were characterized to have a purity of 95.85–99.62%, a specific surface area of 204.3–352.6 m2/g, and a total pore volume of 0.3513–0.5228 cm3/g. The morphology and non-crystal structure of the particles was studied by transmission electron microscope and X-ray powder diffractometer. The controllable textural characteristics allow these particles to be used in several scientific and technological fields, where different levels of purity and textural properties are required.
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