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Effect of alkaline pretreatment on the thermal behavior and chemical properties of rice husk varieties in relation to activated carbon production
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2020 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926, Vol. 139, no 3, p. 1681-1691Article in journal (Refereed) Published
Abstract [en]

Thermal behavior and chemical properties of selected raw and NaOH-pretreated rice husk varieties were investigated. NaOH-pretreatment process involved soaking 5 g rice husk samples in 40 mL of 2%w/v NaOH, shaking (400 rpm) and heating (50 °C) for 3 h. NaOH-pretreated samples were water-washed, oven-dried, and milled for use in the determination of their thermal behavior and surface functional groups. Alkaline wash-water was also analyzed for sugar components. Thermal decomposition temperatures, degradation rates, and the subsequent mass losses varied from one rice husk variety to another. These thermal properties increased after NaOH-pretreatment of the rice husk varieties, reducing their char yields (17.1–20.4% db). These changes mainly had to do with the lignin, hemicellulose, and ash removal from the rice husk varieties, as confirmed by their FTIR analysis, as well as by the sugar composition analysis of their alkaline wash-water. Consequently, the FTIR spectra differed between the raw and NaOH-pretreated rice husk varieties.

Place, publisher, year, edition, pages
Springer , 2020. Vol. 139, no 3, p. 1681-1691
Keywords [en]
NaOH-pretreatment, Rice husk varieties, Sugar composition, Surface functional groups, Thermal behavior, Activated carbon, Alkalinity, Decomposition, Degradation, Fourier transform infrared spectroscopy, NaOH pretreatment, Rice husk, Thermal behaviors, Sodium hydroxide
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263275DOI: 10.1007/s10973-019-08553-6Scopus ID: 2-s2.0-85069521253OAI: oai:DiVA.org:kth-263275DiVA, id: diva2:1367972
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QC 20191105

Available from: 2019-11-05 Created: 2019-11-05 Last updated: 2020-05-29Bibliographically approved

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Kiros, Yohannes

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