Preparation and characterization of cellulose nanocrystals from corncob via ionic liquid [Bmim][HSO 4 ] hydrolysis: effects of major process conditions on dimensions of the product.

Autor: Rasri W; Department of Food, Agriculture and Bioresources, Asian Institute of Technology, (AIT) 58 Moo 9, Km 42, Paholyothin Highway, Klong Luang Pathum Thani 12120 Thailand locnguyen@ait.ac.th., Thu VT; University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST) 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam., Corpuz A; Department of Chemical Engineering, College of Engineering and Architecture, Cagayan State University Carig Sur Tuguegarao City Cagayan Valley 3500 Philippines., Nguyen LT; Department of Food, Agriculture and Bioresources, Asian Institute of Technology, (AIT) 58 Moo 9, Km 42, Paholyothin Highway, Klong Luang Pathum Thani 12120 Thailand locnguyen@ait.ac.th.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2023 Jun 22; Vol. 13 (28), pp. 19020-19029. Date of Electronic Publication: 2023 Jun 22 (Print Publication: 2023).
DOI: 10.1039/d3ra02715e
Abstrakt: In this study, cellulose nanocrystals were prepared via the hydrolysis of corncob (CC) biomass using Brønsted acid ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate [Bmim][HSO 4 ]. The corncob was subjected to alkaline pretreatment, and was then hydrolysed by [Bmim][HSO 4 ], which acted as both solvent and catalyst. The effects of process conditions, including mass percent of CC (1.0-10.0%), reaction temperature (46-110 °C), and reaction time (1.2-2.8 h) on the size of cellulose nanocrystals (IL-CCCNC) were investigated by response surface methodology-central composite design. The obtained IL-CCCNC was characterized by Fourier transforms infrared spectroscopy, zeta sizer, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and thermogravimetry. The results showed that the dimensions of the nanocellulose products were affected by the mass percent of CC and the reaction temperature, but were not significantly influenced by the reaction time under the studied conditions. The optimal conditions, estimated by the developed model, were a mass percent of 2.49%, reaction temperature of 100 °C, and reaction time of 1.5 h. The process successfully produced IL-CCCNC with a yield of 40.13%, average size of 166 nm, and crystallinity index (CrI) of 62.5%. The morphology, chemical fingerprints, and thermal properties of the obtained IL-CCCNC were comparable to those extracted by alkaline and acid hydrolysis. After the reaction, [Bmim][HSO 4 ] could be recovered with a yield of 88.32%, making it a viable green catalyst for the hydrolysis of CC cellulose. The findings are of direct industrial relevance as optimal processes can be developed to produce nanocellulose crystals with desirable size and physicochemical characteristics.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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