Co-Producing Active Carbons and Sodium Silicate from Pyrolyzed Rice Husk by CO2 Activation Coupled with NaOH Solution Boiling

Da Wei Li; Xi Feng Zhu

doi:10.4028/www.scientific.net/AMM.595.30

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Co-Producing Active Carbons and Sodium Silicate from Pyrolyzed Rice Husk by CO₂ Activation Coupled with NaOH Solution Boiling
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 595Co-Producing Active Carbons and Sodium Silicate...

Co-Producing Active Carbons and Sodium Silicate from Pyrolyzed Rice Husk by CO₂ Activation Coupled with NaOH Solution Boiling

Abstract:

Active carbon and sodium silicate were produced simultaneously from pyrolyzed rice husk (PRH) by CO₂ activation coupled with NaOH solution boiling. Doehlert matrix and Derringer's desirability function were applied to optimizing the boiling conditions to achieve a large specific surface area, a high silica extraction and low alkali consumption. In terms of this purpose, the optimum condition was determined as boiling CO₂-activated char with 1mol/L NaOH solution at a liquid/solid ratio of 9.7 mL/g. Under this condition, the modulus of the sodium silicate and the specific surface area (SSA) of the active carbon were 2.62 and 897 m²/g, respectively. The values both reached their respective commercial levels. The pretreatment of the PRH with CO₂ activation can markedly increase the SSA of active carbons.

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Periodical:

Applied Mechanics and Materials (Volume 595)

Pages:

30-35

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.595.30

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Online since:

July 2014

Authors:

Da Wei Li*, Xi Feng Zhu

Keywords:

Active Carbon, Desirability Function, Doehlert Matrix, Rice Husk, Silica, Sodium Silicate

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