Effect of alkaline pretreatment on the thermal behavior and chemical properties of rice husk varieties in relation to activated carbon production

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-...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2020-02, Vol.139 (3), p.1681-1691
Main Authors: Menya, E., Olupot, P. W., Storz, H., Lubwama, M., Kiros, Y., John, M. J.
Format: Article
Language:English
Subjects:
Activated carbon
Alkalinity
Analysis
Analytical Chemistry
Ash removal
Chemical properties
Chemistry
Chemistry and Materials Science
Crop yields
Decomposition
Degradation
Fourier transform infrared spectroscopy
Functional groups
Inorganic Chemistry
Lignin
Measurement Science and Instrumentation
NaOH pretreatment
Organic chemistry
Physical Chemistry
Polymer Sciences
Pretreatment
Rice
Rice husk
Rice husk varieties
Shaking
Sodium hydroxide
Sugar composition
Surface functional groups
Thermal behavior
Thermal behaviors
Thermal decomposition
Thermal properties
Thermodynamic properties
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Summary: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.
ISSN:1388-6150
1588-2926
1588-2926
DOI:10.1007/s10973-019-08553-6