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Formation of silicon carbide from rice husks using enzymatic methods for carbon control



Formation of silicon carbide from rice husks using enzymatic methods for carbon control



Bioresource Technology. 44(1): 47-51



A method employing cellulase treatment was developed to control excess carbon for silicon carbide formation from risk husks. Powered rice husks were delignified with NaOH solution and treated with a mixture of cellulases (Acucelase and Meicelase) to hydrolyze the cellulose of the husks. In rice husks pretreated with 0.5% NaOH, silica was enriched to 29.5% (w/w), and 288 mg of sugar was recovered from 1.0 g of rice husks after 5-days cellulase treatment. The C/SiO-2 ratio reached 0.74, near the optimum ratio for silicon carbide formation. When this silica-enriched sample was heated at 1600 degree C in an atmosphere of argon, alpha-SiC and beta-SiC were formed and matured SiC whiskers were evident. Residual free carbon in the product was 1/5 of heat-treated silica sand mixed with petroleum coke and was 1/11 of rich husk heat-treated without enzyme treatment.

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Accession: 008700560

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DOI: 10.1016/0960-8524(93)90206-q


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