Alpha-, Beta- and Gamma-Cellulose Quantification and Two-Stage Concentrated-Dilute Acid Lignin Recovery from Three Rice Husks: Lignin Characterization and Depolymerization

Singh, Sandip K.; Dhepe, Paresh L.

doi:10.1007/s12649-022-01704-1

Cited by 5 publications

(3 citation statements)

References 54 publications

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“…The small peak of LCNPs at 86.79 ppm may be related to the C 4 of glucose or arabinose units of holocellulose, and the peaks in the range 10–50 ppm are mainly attributed to the alkyl-side chains (−CH 3 , −CH 2 –, −CH–, −C–, CH 3 CO–, etc.). The peaks of LCNPs at 55.9, 100–160, 147.3, 152.7, 173.7, and 182.5 ppm are related to the methoxy (−OCH 3 ) groups, benzene rings, etherified guaiacyl C 3,4 units, C α in β–O–4̀ substructures (A γ ) linked with αC=O units, carbonyl groups of uronic ester, and C=O in spirodienone features of lignin, respectively. , According to the 13 C solid-state NMR, LCNPs are mainly composed of cellulose, hemicellulose, and lignin.…”

Section: Resultsmentioning

confidence: 95%

“…The peaks of LCNPs at 55.9, 100−160, 147.3, 152.7, 173.7, and 182.5 ppm are related to the methoxy (−OCH 3 ) groups, benzene rings, etherified guaiacyl C 3,4 units, C α in β−O−4 substructures (A γ ) linked with αC=O units, carbonyl groups of uronic ester, and C=O in spirodienone features of lignin, respectively. 60,61 According to the 13 C solid-state NMR, LCNPs are mainly composed of cellulose, hemicellulose, and lignin.…”

Section: Extraction Of Lcnps From Cattlementioning

confidence: 99%

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Lignocellulose Nanoparticles Extracted from Cattle Dung as Pickering Emulsifiers for Microencapsulating Phase Change Materials

Ding,

Feng,

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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Nanocelluloses have attracted much attention in both academic and industrial fields. However, nanocelluloses, including cellulose nanocrystals and cellulose nanofibers, are generally produced by a “top-down” strategy with tedious violent chemical reactions and energy-intensive mechanical treatments. Fabrication of nanocellulose via facile and green approaches with a low cost is always challenging and promising. The digestion of grass by ruminants resembles the extraction processing of nanocelluloses from plants. Herein, lignocellulose nanoparticles (LCNPs) were extracted from cattle dung via facile filtration and centrifugation separation methods, indicating that LCNPs occurred naturally in cattle dung and were formed during digestion of grass. LCNPs are mainly composed of lignin, cellulose, and hemicellulose and possess an average diameter of ∼50 nm, high surface charge of −36.2 mV, and outstanding water dispersity. LCNPs show excellent Pickering emulsifying ability just as classic nanocellulose due to their partial wettability with both oil and water phases. LCNP stabilized Pickering emulsions were then employed as templates to prepare phase change material (PCM) microcapsules with melamine-formaldehyde shells to prevent leakage of PCM. The obtained PCM microcapsules display good thermal stability, durability, high PCM core content of 88.9% and phase change enthalpy of 214.3 J g–1, and are promising for thermal energy storage and temperature regulation applications. This study provides a sustainable approach to extract nanocellulose as Pickering emulsifier and will facilitate the high-value-added utilization of cattle dung.

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Section: Resultsmentioning

confidence: 95%

Section: Extraction Of Lcnps From Cattlementioning

confidence: 99%

Lignocellulose Nanoparticles Extracted from Cattle Dung as Pickering Emulsifiers for Microencapsulating Phase Change Materials

Ding,

Feng,

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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show abstract

“…To advance the circular economy and environmental sustainability worldwide, it is inevitable to develop green energy and extract value-added chemicals and materials from biomass [2]. Lignocellulosic biomass can be a potential substitute for fossil raw materials to improve global warming [3]. It is mainly composed of three parts, lignin, cellulose and hemicellulose.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Alkaline Lignin in the Lactic Acid-Choline Chloride System under Mild Conditions

Li¹,

Jiang²,

Chen³

et al. 2023

Journal of Renewable Materials

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Lignin is a natural polymer, second only to cellulose in natural reserves. Degradation is one of the ways to achieve the high-value transformation of lignin. Deep eutectic solvent (DES) thermal degradation of lignin can be used as an excellent green degradation method. This paper introduces the degradation mechanism and effect of the lactic acid-choline chloride DES system in dissolving and degrading alkaline lignin, and the final solvent recovery. It can also be found from the scanning electron microscope (SEM) images that the surface of the degraded solid product is transformed from smooth to disordered. Fourier transform infrared (FTIR) spectroscopy and 1 H-NMR spectroscopy were used to characterize the changes in lignin functional groups during DES treatment. The results showed that the content of phenolic hydroxyl groups increased after degradation, indicating that the β-O-4 ether bond was broken. The molecular weight of the degraded lignin was observed by gel permeation chromatography (GPC), and the lignin residue with low molecular weight and narrow polydispersity index was obtained. The lowest average molecular weight (Mw) reached 2512 g/mol. The ratio of oxygen to carbon atoms in lignin increased substantially during degradation as measured by X-ray photoelectron spectroscopy (XPS), probably because DES treatment was accompanied by many oxidation reactions, which led to significant structural changes in lignin and a large number of ether bond breakage reactions during the reaction. The main final degradation products are aromatic monomers, vanillin, butyrovanillone, etc.

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Recent progress in biomedical and biotechnological applications of lignin-based spherical nano- and microstructures: a comprehensive review

Stanisz

Kłapiszewski

Collins

et al. 2022

Materials Today Chemistry

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Alpha-, Beta- and Gamma-Cellulose Quantification and Two-Stage Concentrated-Dilute Acid Lignin Recovery from Three Rice Husks: Lignin Characterization and Depolymerization

Cited by 5 publications

References 54 publications

Lignocellulose Nanoparticles Extracted from Cattle Dung as Pickering Emulsifiers for Microencapsulating Phase Change Materials

Lignocellulose Nanoparticles Extracted from Cattle Dung as Pickering Emulsifiers for Microencapsulating Phase Change Materials

Degradation of Alkaline Lignin in the Lactic Acid-Choline Chloride System under Mild Conditions

Recent progress in biomedical and biotechnological applications of lignin-based spherical nano- and microstructures: a comprehensive review

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