Silica extraction from integrated refinery of rice straw for production of value-added products

Rice straw is an agricultural residue from rice production, which can be a potential lignocellulosic feedstock for various value-added products. In this study, silica was extracted from the rice straw. The biomass was pre-treated with ethanol and was cooked with 18% w/w sodium hydroxide to extract l...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2019-11, Vol.337 (1), p.12016
Main Authors: Dinh, Cuong Thai, Duy, Hung Nguyen, Le Quang, Dien, Zenitova, Lubov A., Trung, Thanh Nguyen
Format: Article
Language:English
Subjects:
Agricultural production
Caustic soda
Centrifugation
Crop residues
Ethanol
Lignocellulose
pH effects
Refineries
Rice
Rice straw
Silica
Silicon dioxide
Sodium hydroxide
Straw
Sulfuric acid
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Summary:Rice straw is an agricultural residue from rice production, which can be a potential lignocellulosic feedstock for various value-added products. In this study, silica was extracted from the rice straw. The biomass was pre-treated with ethanol and was cooked with 18% w/w sodium hydroxide to extract lignin and silica. The silica was precipitated from the alkaline solution using 30% sulfuric acid to pH 11.5 and was recovered through centrifugation. The obtained solid was washed and then combusted at 575 °C for 6 hours. The obtained ash was dissolved in sodium hydroxide solution at pH 8.0 and then re-precipitated by sulfuric acid to form silica powder, which obtained a yield of about 6.7% w/w dry rice straw. The characteristics of amorphous disk-formed silica, determined using XRD, SEM, EDS, and FT-IR.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/337/1/012016