Synthesis of Sulfonated Magnetic Nano-catalyst Using Rice Husk Ash for Corncob Hydrolysis: Kinetic and Thermodynamic Study

This study developed a magnetic solid acid catalyst for corncob hydrolysis. The core, Fe 3 O 4 nanoparticle of the catalyst, was prepared using the co-precipitation method, which was supported by SiO 2 nanoparticles prepared from rice husk ash. The Fe 3 O 4 /C–SiO 2 was modified to produce a solid a...

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Bibliographic Details
Published in:Waste and biomass valorization 2024-02, Vol.15 (2), p.973-987
Main Authors: Falowo, Olayomi Abiodun, Oyekola, Oluwaseun O., Oladipo, Babatunde, Taiwo, Abiola Ezekiel, Ilesanmi, Adeyosola, Davies, Oluwadabomi
Format: Article
Language:English
Subjects:
Ashes
Catalysts
Cellulose
Chemical synthesis
Degradation products
Engineering
Environment
Environmental Engineering/Biotechnology
Glucose
Hydrolysis
Industrial Pollution Prevention
Iron oxides
Nanoparticles
Original Paper
Renewable and Green Energy
Rice
Silicon dioxide
Sulfonation
Thermodynamics
Waste Management/Waste Technology
X ray photoelectron spectroscopy
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Summary:This study developed a magnetic solid acid catalyst for corncob hydrolysis. The core, Fe 3 O 4 nanoparticle of the catalyst, was prepared using the co-precipitation method, which was supported by SiO 2 nanoparticles prepared from rice husk ash. The Fe 3 O 4 /C–SiO 2 was modified to produce a solid acid catalyst via the sulfonation method. Properties of Fe 3 O 4 /C and the sulfonated catalyst were assessed using FTIR, SEM, EDS, XRD, XPS, and VSM. Pretreated corncob was hydrolyzed at 80, 90, and 100 o C under a solid-to-liquid ratio of 1:10, using sulfonated Fe 3 O 4 /C for 100 min. Results showed that sulfonated Fe 3 O 4 /C–SiO 2 contained HSO 3 group indicating the success of the sulfonation process. The catalyst possessed a porous surface with a surface area of 72 m 2 /g and a total acid density of 0.96 mmol/g. The hydrolysis rate of corncob increased with reaction time and temperature, with the highest total reducing sugar observed at 90 °C. Batch data obtained from the corncob hydrolysis using a solid catalyst can be described by Saeman’s and integral first-order reaction models, establishing that cellulose hydrolysis is a first-order reaction. The activation energy for glucose formation was 12.33 and 42.4 kJ/mol for Saeman’s and first-order reaction models, respectively. Thermodynamic parameters; ∆ H , ∆ S , and ∆ G revealed that the hydrolysis process was thermodynamically favoured, and the glucose formation was more stable relative to the degradation products. Sulfonated Fe 3 O 4 /C–SiO 2 showed sustained activity after being reused four times. Graphical Abstract
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-023-02210-8